/*
 * schemas.c : implementation of the XML Schema handling and
 *             schema validity checking
 *
 * See Copyright for the status of this software.
 *
 * Daniel Veillard <veillard@redhat.com>
 */

/*
 * TODO:
 *   - when types are redefined in includes, check that all
 *     types in the redef list are equal
 *     -> need a type equality operation.
 *   - if we don't intend to use the schema for schemas, we
 *     need to validate all schema attributes (ref, type, name)
 *     against their types.
 *   - Eliminate item creation for: ??
 *
 * URGENT TODO:
 *   - For xsi-driven schema acquisition, augment the IDCs after every
 *     acquisition episode (xmlSchemaAugmentIDC).
 *
 * NOTES:
 *   - Elimated item creation for: <restriction>, <extension>,
 *     <simpleContent>, <complexContent>, <list>, <union>
 *
 * PROBLEMS:
 *   - http://lists.w3.org/Archives/Public/www-xml-schema-comments/2005JulSep/0337.html
 *     IDC XPath expression and chameleon includes: the targetNamespace is changed, so
 *     XPath will have trouble to resolve to this namespace, since not known.
 *
 *
 * CONSTRAINTS:
 *
 * Schema Component Constraint:
 *   All Group Limited (cos-all-limited)
 *   Status: complete
 *   (1.2)
 *     In xmlSchemaGroupDefReferenceTermFixup() and
 *   (2)
 *     In xmlSchemaParseModelGroup()
 *     TODO: Actually this should go to component-level checks,
 *     but is done here due to performance. Move it to an other layer
 *     is schema construction via an API is implemented.
 */
#define IN_LIBXML
#include "libxml.h"

#ifdef LIBXML_SCHEMAS_ENABLED

#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include <libxml/hash.h>
#include <libxml/uri.h>
#include <libxml/xmlschemas.h>
#include <libxml/schemasInternals.h>
#include <libxml/xmlschemastypes.h>
#include <libxml/xmlautomata.h>
#include <libxml/xmlregexp.h>
#include <libxml/dict.h>
#include <libxml/encoding.h>
#include <libxml/xmlIO.h>
#ifdef LIBXML_PATTERN_ENABLED
#include <libxml/pattern.h>
#endif
#ifdef LIBXML_READER_ENABLED
#include <libxml/xmlreader.h>
#endif

/* #define DEBUG 1 */

/* #define DEBUG_CONTENT 1 */

/* #define DEBUG_TYPE 1 */

/* #define DEBUG_CONTENT_REGEXP 1 */

/* #define DEBUG_AUTOMATA 1 */

/* #define DEBUG_IDC */

/* #define DEBUG_IDC_NODE_TABLE */

/* #define WXS_ELEM_DECL_CONS_ENABLED */

#ifdef DEBUG_IDC
 #ifndef DEBUG_IDC_NODE_TABLE
  #define DEBUG_IDC_NODE_TABLE
 #endif
#endif   

/* #define ENABLE_PARTICLE_RESTRICTION 1 */

#define ENABLE_REDEFINE

/* #define ENABLE_NAMED_LOCALS */

/* #define ENABLE_IDC_NODE_TABLES_TEST */

#define DUMP_CONTENT_MODEL

#ifdef LIBXML_READER_ENABLED
/* #define XML_SCHEMA_READER_ENABLED */
#endif

#define UNBOUNDED (1 << 30)
#define TODO                                                            \
    xmlGenericError(xmlGenericErrorContext,                             \
            "Unimplemented block at %s:%d\n",                           \
            __FILE__, __LINE__);

#define XML_SCHEMAS_NO_NAMESPACE (const xmlChar *) "##"

/*
 * The XML Schemas namespaces
 */
static const xmlChar *xmlSchemaNs = (const xmlChar *)
    "http://www.w3.org/2001/XMLSchema";

static const xmlChar *xmlSchemaInstanceNs = (const xmlChar *)
    "http://www.w3.org/2001/XMLSchema-instance";

static const xmlChar *xmlNamespaceNs = (const xmlChar *)
    "http://www.w3.org/2000/xmlns/";

/*
* Come casting macros.
*/
#define ACTXT_CAST (xmlSchemaAbstractCtxtPtr)
#define PCTXT_CAST (xmlSchemaParserCtxtPtr)
#define VCTXT_CAST (xmlSchemaValidCtxtPtr)
#define WXS_BASIC_CAST (xmlSchemaBasicItemPtr)
#define WXS_TREE_CAST (xmlSchemaTreeItemPtr)
#define WXS_PTC_CAST (xmlSchemaParticlePtr)
#define WXS_TYPE_CAST (xmlSchemaTypePtr)
#define WXS_ELEM_CAST (xmlSchemaElementPtr)
#define WXS_ATTR_GROUP_CAST (xmlSchemaAttributeGroupPtr)
#define WXS_ATTR_CAST (xmlSchemaAttributePtr)
#define WXS_ATTR_USE_CAST (xmlSchemaAttributeUsePtr)
#define WXS_ATTR_PROHIB_CAST (xmlSchemaAttributeUseProhibPtr)
#define WXS_MODEL_GROUPDEF_CAST (xmlSchemaModelGroupDefPtr)
#define WXS_MODEL_GROUP_CAST (xmlSchemaModelGroupPtr)
#define WXS_IDC_CAST (xmlSchemaIDCPtr)
#define WXS_QNAME_CAST (xmlSchemaQNameRefPtr)
#define WXS_LIST_CAST (xmlSchemaItemListPtr)

/*
* Macros to query common properties of components.
*/
#define WXS_ITEM_NODE(i) xmlSchemaGetComponentNode(WXS_BASIC_CAST (i))

#define WXS_ITEM_TYPE_NAME(i) xmlSchemaGetComponentTypeStr(WXS_BASIC_CAST (i))
/*
* Macros for element declarations.
*/
#define WXS_ELEM_TYPEDEF(e) (e)->subtypes

#define WXS_SUBST_HEAD(item) (item)->refDecl
/*
* Macros for attribute declarations.
*/
#define WXS_ATTR_TYPEDEF(a) (a)->subtypes
/*
* Macros for attribute uses.
*/
#define WXS_ATTRUSE_DECL(au) WXS_ATTR_CAST (WXS_ATTR_USE_CAST (au))->attrDecl

#define WXS_ATTRUSE_TYPEDEF(au) WXS_ATTR_TYPEDEF(WXS_ATTRUSE_DECL( WXS_ATTR_USE_CAST au))

#define WXS_ATTRUSE_DECL_NAME(au) (WXS_ATTRUSE_DECL(au))->name

#define WXS_ATTRUSE_DECL_TNS(au) (WXS_ATTRUSE_DECL(au))->targetNamespace
/*
* Macros for attribute groups.
*/
#define WXS_ATTR_GROUP_HAS_REFS(ag) ((WXS_ATTR_GROUP_CAST (ag))->flags & XML_SCHEMAS_ATTRGROUP_HAS_REFS)
#define WXS_ATTR_GROUP_EXPANDED(ag) ((WXS_ATTR_GROUP_CAST (ag))->flags & XML_SCHEMAS_ATTRGROUP_WILDCARD_BUILDED)
/*
* Macros for particles.
*/
#define WXS_PARTICLE(p) WXS_PTC_CAST (p)

#define WXS_PARTICLE_TERM(p) (WXS_PARTICLE(p))->children

#define WXS_PARTICLE_TERM_AS_ELEM(p) (WXS_ELEM_CAST WXS_PARTICLE_TERM(p))

#define WXS_PARTICLE_MODEL(p) WXS_MODEL_GROUP_CAST WXS_PARTICLE(p)->children
/*
* Macros for model groups definitions.
*/
#define WXS_MODELGROUPDEF_MODEL(mgd) (WXS_MODEL_GROUP_CAST (mgd))->children
/*
* Macros for model groups.
*/
#define WXS_IS_MODEL_GROUP(i) \
    (((i)->type == XML_SCHEMA_TYPE_SEQUENCE) || \
     ((i)->type == XML_SCHEMA_TYPE_CHOICE) || \
     ((i)->type == XML_SCHEMA_TYPE_ALL))

#define WXS_MODELGROUP_PARTICLE(mg) WXS_PTC_CAST (mg)->children
/*
* Macros for schema buckets.
*/
#define WXS_IS_BUCKET_INCREDEF(t) (((t) == XML_SCHEMA_SCHEMA_INCLUDE) || \
    ((t) == XML_SCHEMA_SCHEMA_REDEFINE))

#define WXS_IS_BUCKET_IMPMAIN(t) (((t) == XML_SCHEMA_SCHEMA_MAIN) || \
    ((t) == XML_SCHEMA_SCHEMA_IMPORT))

#define WXS_IMPBUCKET(b) ((xmlSchemaImportPtr) (b))

#define WXS_INCBUCKET(b) ((xmlSchemaIncludePtr) (b))
/*
* Macros for complex/simple types.
*/
#define WXS_IS_ANYTYPE(i) \
     (( (i)->type == XML_SCHEMA_TYPE_BASIC) && \
      ( (WXS_TYPE_CAST (i))->builtInType == XML_SCHEMAS_ANYTYPE))

#define WXS_IS_COMPLEX(i) \
    (((i)->type == XML_SCHEMA_TYPE_COMPLEX) || \
     ((i)->builtInType == XML_SCHEMAS_ANYTYPE))

#define WXS_IS_SIMPLE(item) \
    ((item->type == XML_SCHEMA_TYPE_SIMPLE) || \
     ((item->type == XML_SCHEMA_TYPE_BASIC) && \
      (item->builtInType != XML_SCHEMAS_ANYTYPE)))

#define WXS_IS_ANY_SIMPLE_TYPE(i) \
    (((i)->type == XML_SCHEMA_TYPE_BASIC) && \
      ((i)->builtInType == XML_SCHEMAS_ANYSIMPLETYPE))

#define WXS_IS_RESTRICTION(t) \
    ((t)->flags & XML_SCHEMAS_TYPE_DERIVATION_METHOD_RESTRICTION)

#define WXS_IS_EXTENSION(t) \
    ((t)->flags & XML_SCHEMAS_TYPE_DERIVATION_METHOD_EXTENSION)

#define WXS_IS_TYPE_NOT_FIXED(i) \
    (((i)->type != XML_SCHEMA_TYPE_BASIC) && \
     (((i)->flags & XML_SCHEMAS_TYPE_INTERNAL_RESOLVED) == 0))

#define WXS_IS_TYPE_NOT_FIXED_1(item) \
    (((item)->type != XML_SCHEMA_TYPE_BASIC) && \
     (((item)->flags & XML_SCHEMAS_TYPE_FIXUP_1) == 0))

#define WXS_TYPE_IS_GLOBAL(t) ((t)->flags & XML_SCHEMAS_TYPE_GLOBAL)

#define WXS_TYPE_IS_LOCAL(t) (((t)->flags & XML_SCHEMAS_TYPE_GLOBAL) == 0)
/*
* Macros for exclusively for complex types.
*/
#define WXS_HAS_COMPLEX_CONTENT(item) \
    ((item->contentType == XML_SCHEMA_CONTENT_MIXED) || \
     (item->contentType == XML_SCHEMA_CONTENT_EMPTY) || \
     (item->contentType == XML_SCHEMA_CONTENT_ELEMENTS))

#define WXS_HAS_SIMPLE_CONTENT(item) \
    ((item->contentType == XML_SCHEMA_CONTENT_SIMPLE) || \
     (item->contentType == XML_SCHEMA_CONTENT_BASIC))

#define WXS_HAS_MIXED_CONTENT(item) \
    (item->contentType == XML_SCHEMA_CONTENT_MIXED)

#define WXS_EMPTIABLE(t) \
    (xmlSchemaIsParticleEmptiable(WXS_PTC_CAST (t)->subtypes))

#define WXS_TYPE_CONTENTTYPE(t) (t)->subtypes

#define WXS_TYPE_PARTICLE(t) WXS_PTC_CAST (t)->subtypes

#define WXS_TYPE_PARTICLE_TERM(t) WXS_PARTICLE_TERM(WXS_TYPE_PARTICLE(t))
/*
* Macros for exclusively for simple types.
*/
#define WXS_LIST_ITEMTYPE(t) (t)->subtypes

#define WXS_IS_ATOMIC(t) (t->flags & XML_SCHEMAS_TYPE_VARIETY_ATOMIC)

#define WXS_IS_LIST(t) (t->flags & XML_SCHEMAS_TYPE_VARIETY_LIST)

#define WXS_IS_UNION(t) (t->flags & XML_SCHEMAS_TYPE_VARIETY_UNION)
/*
* Misc parser context macros.
*/
#define WXS_CONSTRUCTOR(ctx) (ctx)->constructor

#define WXS_HAS_BUCKETS(ctx) \
( (WXS_CONSTRUCTOR((ctx))->buckets != NULL) && \
(WXS_CONSTRUCTOR((ctx))->buckets->nbItems > 0) )

#define WXS_SUBST_GROUPS(ctx) WXS_CONSTRUCTOR((ctx))->substGroups

#define WXS_BUCKET(ctx) WXS_CONSTRUCTOR((ctx))->bucket

#define WXS_SCHEMA(ctx) (ctx)->schema

#define WXS_ADD_LOCAL(ctx, item) \
    xmlSchemaAddItemSize(&(WXS_BUCKET(ctx)->locals), 10, item)

#define WXS_ADD_GLOBAL(ctx, item) \
    xmlSchemaAddItemSize(&(WXS_BUCKET(ctx)->globals), 5, item)

#define WXS_ADD_PENDING(ctx, item) \
    xmlSchemaAddItemSize(&((ctx)->constructor->pending), 10, item)
/*
* xmlSchemaItemList macros.
*/
#define WXS_ILIST_IS_EMPTY(l) ((l == NULL) || ((l)->nbItems == 0))
/*
* Misc macros.
*/
#define IS_SCHEMA(node, type) \
   ((node != NULL) && (node->ns != NULL) && \
    (xmlStrEqual(node->name, (const xmlChar *) type)) && \
    (xmlStrEqual(node->ns->href, xmlSchemaNs)))

#define FREE_AND_NULL(str) if ((str) != NULL) { xmlFree((xmlChar *) (str)); str = NULL; }

/*
* Since we put the default/fixed values into the dict, we can
* use pointer comparison for those values.
* REMOVED: (xmlStrEqual((v1), (v2)))
*/
#define WXS_ARE_DEFAULT_STR_EQUAL(v1, v2) ((v1) == (v2))

#define INODE_NILLED(item) (item->flags & XML_SCHEMA_ELEM_INFO_NILLED)

#define CAN_PARSE_SCHEMA(b) (((b)->doc != NULL) && ((b)->parsed == 0))

#define HFAILURE if (res == -1) goto exit_failure;

#define HERROR if (res != 0) goto exit_error;

#define HSTOP(ctx) if ((ctx)->stop) goto exit;
/*
* Some flags used for various schema constraints.
*/
#define SUBSET_RESTRICTION  1<<0
#define SUBSET_EXTENSION    1<<1
#define SUBSET_SUBSTITUTION 1<<2
#define SUBSET_LIST         1<<3
#define SUBSET_UNION        1<<4

typedef struct _xmlSchemaNodeInfo xmlSchemaNodeInfo;
typedef xmlSchemaNodeInfo *xmlSchemaNodeInfoPtr;

typedef struct _xmlSchemaItemList xmlSchemaItemList;
typedef xmlSchemaItemList *xmlSchemaItemListPtr;
struct _xmlSchemaItemList {
    void **items;  /* used for dynamic addition of schemata */
    int nbItems; /* used for dynamic addition of schemata */
    int sizeItems; /* used for dynamic addition of schemata */
};

#define XML_SCHEMA_CTXT_PARSER 1
#define XML_SCHEMA_CTXT_VALIDATOR 2

typedef struct _xmlSchemaAbstractCtxt xmlSchemaAbstractCtxt;
typedef xmlSchemaAbstractCtxt *xmlSchemaAbstractCtxtPtr;
struct _xmlSchemaAbstractCtxt {
    int type; /* E.g. XML_SCHEMA_CTXT_VALIDATOR */
};

typedef struct _xmlSchemaBucket xmlSchemaBucket;
typedef xmlSchemaBucket *xmlSchemaBucketPtr;

#define XML_SCHEMA_SCHEMA_MAIN 0
#define XML_SCHEMA_SCHEMA_IMPORT 1
#define XML_SCHEMA_SCHEMA_INCLUDE 2
#define XML_SCHEMA_SCHEMA_REDEFINE 3

/**
 * xmlSchemaSchemaRelation: 
 *
 * Used to create a graph of schema relationships.
 */
typedef struct _xmlSchemaSchemaRelation xmlSchemaSchemaRelation;
typedef xmlSchemaSchemaRelation *xmlSchemaSchemaRelationPtr;
struct _xmlSchemaSchemaRelation {
    xmlSchemaSchemaRelationPtr next;
    int type; /* E.g. XML_SCHEMA_SCHEMA_IMPORT */
    const xmlChar *importNamespace;
    xmlSchemaBucketPtr bucket;
};

#define XML_SCHEMA_BUCKET_MARKED 1<<0
#define XML_SCHEMA_BUCKET_COMPS_ADDED 1<<1

struct _xmlSchemaBucket {
    int type;
    int flags;
    const xmlChar *schemaLocation;
    const xmlChar *origTargetNamespace;
    const xmlChar *targetNamespace;
    xmlDocPtr doc;
    xmlSchemaSchemaRelationPtr relations;
    int located;
    int parsed;
    int imported;
    int preserveDoc;
    xmlSchemaItemListPtr globals; /* Global components. */ 
    xmlSchemaItemListPtr locals; /* Local components. */
};

/**
 * xmlSchemaImport: 
 * (extends xmlSchemaBucket)
 *
 * Reflects a schema. Holds some information
 * about the schema and its toplevel components. Duplicate
 * toplevel components are not checked at this level.
 */
typedef struct _xmlSchemaImport xmlSchemaImport;
typedef xmlSchemaImport *xmlSchemaImportPtr;
struct _xmlSchemaImport {
    int type; /* Main OR import OR include. */
    int flags;
    const xmlChar *schemaLocation; /* The URI of the schema document. */
    /* For chameleon includes, @origTargetNamespace will be NULL */
    const xmlChar *origTargetNamespace;
    /* 
    * For chameleon includes, @targetNamespace will be the
    * targetNamespace of the including schema. 
    */
    const xmlChar *targetNamespace;
    xmlDocPtr doc; /* The schema node-tree. */
    /* @relations will hold any included/imported/redefined schemas. */
    xmlSchemaSchemaRelationPtr relations;
    int located;
    int parsed;
    int imported;
    int preserveDoc;
    xmlSchemaItemListPtr globals;
    xmlSchemaItemListPtr locals;
    /* The imported schema. */
    xmlSchemaPtr schema;
};

/*
* (extends xmlSchemaBucket)
*/
typedef struct _xmlSchemaInclude xmlSchemaInclude;
typedef xmlSchemaInclude *xmlSchemaIncludePtr;
struct _xmlSchemaInclude {
    int type;
    int flags;
    const xmlChar *schemaLocation;
    const xmlChar *origTargetNamespace;
    const xmlChar *targetNamespace;
    xmlDocPtr doc;
    xmlSchemaSchemaRelationPtr relations;
    int located;
    int parsed;
    int imported;
    int preserveDoc;
    xmlSchemaItemListPtr globals; /* Global components. */ 
    xmlSchemaItemListPtr locals; /* Local components. */

    /* The owning main or import schema bucket. */
    xmlSchemaImportPtr ownerImport;
};

/**
 * xmlSchemaBasicItem:
 *
 * The abstract base type for schema components.
 */
typedef struct _xmlSchemaBasicItem xmlSchemaBasicItem;
typedef xmlSchemaBasicItem *xmlSchemaBasicItemPtr;
struct _xmlSchemaBasicItem {
    xmlSchemaTypeType type;
};

/**
 * xmlSchemaAnnotItem:
 *
 * The abstract base type for annotated schema components.
 * (Extends xmlSchemaBasicItem)
 */
typedef struct _xmlSchemaAnnotItem xmlSchemaAnnotItem;
typedef xmlSchemaAnnotItem *xmlSchemaAnnotItemPtr;
struct _xmlSchemaAnnotItem {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
};

/**
 * xmlSchemaTreeItem:
 *
 * The abstract base type for tree-like structured schema components.
 * (Extends xmlSchemaAnnotItem)
 */
typedef struct _xmlSchemaTreeItem xmlSchemaTreeItem;
typedef xmlSchemaTreeItem *xmlSchemaTreeItemPtr;
struct _xmlSchemaTreeItem {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
    xmlSchemaTreeItemPtr next;
    xmlSchemaTreeItemPtr children;
};


#define XML_SCHEMA_ATTR_USE_FIXED 1<<0
/**
 * xmlSchemaAttributeUsePtr:
 *
 * The abstract base type for tree-like structured schema components.
 * (Extends xmlSchemaTreeItem)
 */
typedef struct _xmlSchemaAttributeUse xmlSchemaAttributeUse;
typedef xmlSchemaAttributeUse *xmlSchemaAttributeUsePtr;
struct _xmlSchemaAttributeUse {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
    xmlSchemaAttributeUsePtr next; /* The next attr. use. */
    /* 
    * The attr. decl. OR a QName-ref. to an attr. decl. OR
    * a QName-ref. to an attribute group definition.
    */
    xmlSchemaAttributePtr attrDecl;

    int flags;
    xmlNodePtr node;
    int occurs; /* required, optional */
    const xmlChar * defValue;
    xmlSchemaValPtr defVal;
};

/**
 * xmlSchemaAttributeUseProhibPtr:
 *
 * A helper component to reflect attribute prohibitions.
 * (Extends xmlSchemaBasicItem)
 */
typedef struct _xmlSchemaAttributeUseProhib xmlSchemaAttributeUseProhib;
typedef xmlSchemaAttributeUseProhib *xmlSchemaAttributeUseProhibPtr;
struct _xmlSchemaAttributeUseProhib {
    xmlSchemaTypeType type; /* == XML_SCHEMA_EXTRA_ATTR_USE_PROHIB */
    xmlNodePtr node;
    const xmlChar *name;
    const xmlChar *targetNamespace;
    int isRef;
};

/**
 * xmlSchemaRedef:
 */
typedef struct _xmlSchemaRedef xmlSchemaRedef;
typedef xmlSchemaRedef *xmlSchemaRedefPtr;
struct _xmlSchemaRedef {
    xmlSchemaRedefPtr next;
    xmlSchemaBasicItemPtr item; /* The redefining component. */
    xmlSchemaBasicItemPtr reference; /* The referencing component. */
    xmlSchemaBasicItemPtr target; /* The to-be-redefined component. */
    const xmlChar *refName; /* The name of the to-be-redefined component. */
    const xmlChar *refTargetNs; /* The target namespace of the
                                   to-be-redefined comp. */
    xmlSchemaBucketPtr targetBucket; /* The redefined schema. */
};

/**
 * xmlSchemaConstructionCtxt:
 */
typedef struct _xmlSchemaConstructionCtxt xmlSchemaConstructionCtxt;
typedef xmlSchemaConstructionCtxt *xmlSchemaConstructionCtxtPtr;
struct _xmlSchemaConstructionCtxt {
    xmlSchemaPtr mainSchema; /* The main schema. */
    xmlSchemaBucketPtr mainBucket; /* The main schema bucket */
    xmlDictPtr dict;
    xmlSchemaItemListPtr buckets; /* List of schema buckets. */
    /* xmlSchemaItemListPtr relations; */ /* List of schema relations. */
    xmlSchemaBucketPtr bucket; /* The current schema bucket */    
    xmlSchemaItemListPtr pending; /* All Components of all schemas that
                                     need to be fixed. */
    xmlHashTablePtr substGroups;
    xmlSchemaRedefPtr redefs;
    xmlSchemaRedefPtr lastRedef;
};

#define XML_SCHEMAS_PARSE_ERROR         1
#define SCHEMAS_PARSE_OPTIONS XML_PARSE_NOENT

struct _xmlSchemaParserCtxt {
    int type;
    void *errCtxt;             /* user specific error context */
    xmlSchemaValidityErrorFunc error;   /* the callback in case of errors */
    xmlSchemaValidityWarningFunc warning;       /* the callback in case of warning */
    int err;
    int nberrors;
    xmlStructuredErrorFunc serror;

    xmlSchemaConstructionCtxtPtr constructor;
    int ownsConstructor; /* TODO: Move this to parser *flags*. */

    /* xmlSchemaPtr topschema;  */
    /* xmlHashTablePtr namespaces;  */

    xmlSchemaPtr schema;        /* The main schema in use */
    int counter;

    const xmlChar *URL;
    xmlDocPtr doc;
    int preserve;               /* Whether the doc should be freed  */

    const char *buffer;
    int size;

    /*
     * Used to build complex element content models
     */
    xmlAutomataPtr am;
    xmlAutomataStatePtr start;
    xmlAutomataStatePtr end;
    xmlAutomataStatePtr state;

    xmlDictPtr dict;            /* dictionnary for interned string names */
    xmlSchemaTypePtr ctxtType; /* The current context simple/complex type */
    int options;
    xmlSchemaValidCtxtPtr vctxt;
    int isS4S;
    int isRedefine;
    int xsiAssemble;
    int stop; /* If the parser should stop; i.e. a critical error. */
    const xmlChar *targetNamespace;
    xmlSchemaBucketPtr redefined; /* The schema to be redefined. */

    xmlSchemaRedefPtr redef; /* Used for redefinitions. */
    int redefCounter; /* Used for redefinitions. */ 
    xmlSchemaItemListPtr attrProhibs;
};

/**
 * xmlSchemaQNameRef:
 *
 * A component reference item (not a schema component)
 * (Extends xmlSchemaBasicItem)
 */
typedef struct _xmlSchemaQNameRef xmlSchemaQNameRef;
typedef xmlSchemaQNameRef *xmlSchemaQNameRefPtr;
struct _xmlSchemaQNameRef {
    xmlSchemaTypeType type;
    xmlSchemaBasicItemPtr item; /* The resolved referenced item. */
    xmlSchemaTypeType itemType;
    const xmlChar *name;
    const xmlChar *targetNamespace;
    xmlNodePtr node;
};

/**
 * xmlSchemaParticle:
 *
 * A particle component.
 * (Extends xmlSchemaTreeItem)
 */
typedef struct _xmlSchemaParticle xmlSchemaParticle;
typedef xmlSchemaParticle *xmlSchemaParticlePtr;
struct _xmlSchemaParticle {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
    xmlSchemaTreeItemPtr next; /* next particle */
    xmlSchemaTreeItemPtr children; /* the "term" (e.g. a model group,
        a group definition, a XML_SCHEMA_EXTRA_QNAMEREF (if a reference),
        etc.) */
    int minOccurs;
    int maxOccurs;
    xmlNodePtr node;
};

/**
 * xmlSchemaModelGroup:
 *
 * A model group component.
 * (Extends xmlSchemaTreeItem)
 */
typedef struct _xmlSchemaModelGroup xmlSchemaModelGroup;
typedef xmlSchemaModelGroup *xmlSchemaModelGroupPtr;
struct _xmlSchemaModelGroup {
    xmlSchemaTypeType type; /* XML_SCHEMA_TYPE_SEQUENCE, XML_SCHEMA_TYPE_CHOICE, XML_SCHEMA_TYPE_ALL */
    xmlSchemaAnnotPtr annot;
    xmlSchemaTreeItemPtr next; /* not used */
    xmlSchemaTreeItemPtr children; /* first particle (OR "element decl" OR "wildcard") */
    xmlNodePtr node;
};

#define XML_SCHEMA_MODEL_GROUP_DEF_MARKED 1<<0
#define XML_SCHEMA_MODEL_GROUP_DEF_REDEFINED 1<<1
/**
 * xmlSchemaModelGroupDef:
 *
 * A model group definition component.
 * (Extends xmlSchemaTreeItem)
 */
typedef struct _xmlSchemaModelGroupDef xmlSchemaModelGroupDef;
typedef xmlSchemaModelGroupDef *xmlSchemaModelGroupDefPtr;
struct _xmlSchemaModelGroupDef {
    xmlSchemaTypeType type; /* XML_SCHEMA_TYPE_GROUP */
    xmlSchemaAnnotPtr annot;
    xmlSchemaTreeItemPtr next; /* not used */
    xmlSchemaTreeItemPtr children; /* the "model group" */
    const xmlChar *name;
    const xmlChar *targetNamespace;
    xmlNodePtr node;
    int flags;
};

typedef struct _xmlSchemaIDC xmlSchemaIDC;
typedef xmlSchemaIDC *xmlSchemaIDCPtr;

/**
 * xmlSchemaIDCSelect:
 *
 * The identity-constraint "field" and "selector" item, holding the
 * XPath expression.
 */
typedef struct _xmlSchemaIDCSelect xmlSchemaIDCSelect;
typedef xmlSchemaIDCSelect *xmlSchemaIDCSelectPtr;
struct _xmlSchemaIDCSelect {
    xmlSchemaIDCSelectPtr next;
    xmlSchemaIDCPtr idc;
    int index; /* an index position if significant for IDC key-sequences */
    const xmlChar *xpath; /* the XPath expression */
    void *xpathComp; /* the compiled XPath expression */
};

/**
 * xmlSchemaIDC:
 *
 * The identity-constraint definition component.
 * (Extends xmlSchemaAnnotItem)
 */

struct _xmlSchemaIDC {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
    xmlSchemaIDCPtr next;
    xmlNodePtr node;
    const xmlChar *name;
    const xmlChar *targetNamespace;
    xmlSchemaIDCSelectPtr selector;
    xmlSchemaIDCSelectPtr fields;
    int nbFields;
    xmlSchemaQNameRefPtr ref;
};

/**
 * xmlSchemaIDCAug:
 *
 * The augmented IDC information used for validation.
 */
typedef struct _xmlSchemaIDCAug xmlSchemaIDCAug;
typedef xmlSchemaIDCAug *xmlSchemaIDCAugPtr;
struct _xmlSchemaIDCAug {
    xmlSchemaIDCAugPtr next; /* next in a list */
    xmlSchemaIDCPtr def; /* the IDC definition */
    int keyrefDepth; /* the lowest tree level to which IDC
                        tables need to be bubbled upwards */
};

/**
 * xmlSchemaPSVIIDCKeySequence:
 *
 * The key sequence of a node table item.
 */
typedef struct _xmlSchemaPSVIIDCKey xmlSchemaPSVIIDCKey;
typedef xmlSchemaPSVIIDCKey *xmlSchemaPSVIIDCKeyPtr;
struct _xmlSchemaPSVIIDCKey {
    xmlSchemaTypePtr type;
    xmlSchemaValPtr val;
};

/**
 * xmlSchemaPSVIIDCNode:
 *
 * The node table item of a node table.
 */
typedef struct _xmlSchemaPSVIIDCNode xmlSchemaPSVIIDCNode;
typedef xmlSchemaPSVIIDCNode *xmlSchemaPSVIIDCNodePtr;
struct _xmlSchemaPSVIIDCNode {
    xmlNodePtr node;
    xmlSchemaPSVIIDCKeyPtr *keys;
    int nodeLine;
    int nodeQNameID;    

};

/**
 * xmlSchemaPSVIIDCBinding:
 *
 * The identity-constraint binding item of the [identity-constraint table].
 */
typedef struct _xmlSchemaPSVIIDCBinding xmlSchemaPSVIIDCBinding;
typedef xmlSchemaPSVIIDCBinding *xmlSchemaPSVIIDCBindingPtr;
struct _xmlSchemaPSVIIDCBinding {
    xmlSchemaPSVIIDCBindingPtr next; /* next binding of a specific node */
    xmlSchemaIDCPtr definition; /* the IDC definition */
    xmlSchemaPSVIIDCNodePtr *nodeTable; /* array of key-sequences */
    int nbNodes; /* number of entries in the node table */
    int sizeNodes; /* size of the node table */
    xmlSchemaItemListPtr dupls;
};


#define XPATH_STATE_OBJ_TYPE_IDC_SELECTOR 1
#define XPATH_STATE_OBJ_TYPE_IDC_FIELD 2

#define XPATH_STATE_OBJ_MATCHES -2
#define XPATH_STATE_OBJ_BLOCKED -3

typedef struct _xmlSchemaIDCMatcher xmlSchemaIDCMatcher;
typedef xmlSchemaIDCMatcher *xmlSchemaIDCMatcherPtr;

/**
 * xmlSchemaIDCStateObj:
 *
 * The state object used to evaluate XPath expressions.
 */
typedef struct _xmlSchemaIDCStateObj xmlSchemaIDCStateObj;
typedef xmlSchemaIDCStateObj *xmlSchemaIDCStateObjPtr;
struct _xmlSchemaIDCStateObj {
    int type;
    xmlSchemaIDCStateObjPtr next; /* next if in a list */
    int depth; /* depth of creation */
    int *history; /* list of (depth, state-id) tuples */
    int nbHistory;
    int sizeHistory;
    xmlSchemaIDCMatcherPtr matcher; /* the correspondent field/selector
                                       matcher */
    xmlSchemaIDCSelectPtr sel;
    void *xpathCtxt;
};

#define IDC_MATCHER 0

/**
 * xmlSchemaIDCMatcher:
 *
 * Used to evaluate IDC selectors (and fields).
 */
struct _xmlSchemaIDCMatcher {
    int type;
    int depth; /* the tree depth at creation time */
    xmlSchemaIDCMatcherPtr next; /* next in the list */
    xmlSchemaIDCMatcherPtr nextCached; /* next in the cache list */
    xmlSchemaIDCAugPtr aidc; /* the augmented IDC item */
    int idcType;
    xmlSchemaPSVIIDCKeyPtr **keySeqs; /* the key-sequences of the target
                                         elements */
    int sizeKeySeqs;
    xmlSchemaItemListPtr targets; /* list of target-node
                                     (xmlSchemaPSVIIDCNodePtr) entries */
};

/*
* Element info flags.
*/
#define XML_SCHEMA_NODE_INFO_FLAG_OWNED_NAMES  1<<0
#define XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES 1<<1
#define XML_SCHEMA_ELEM_INFO_NILLED            1<<2
#define XML_SCHEMA_ELEM_INFO_LOCAL_TYPE        1<<3

#define XML_SCHEMA_NODE_INFO_VALUE_NEEDED      1<<4
#define XML_SCHEMA_ELEM_INFO_EMPTY             1<<5
#define XML_SCHEMA_ELEM_INFO_HAS_CONTENT       1<<6

#define XML_SCHEMA_ELEM_INFO_HAS_ELEM_CONTENT  1<<7
#define XML_SCHEMA_ELEM_INFO_ERR_BAD_CONTENT  1<<8
#define XML_SCHEMA_NODE_INFO_ERR_NOT_EXPECTED  1<<9
#define XML_SCHEMA_NODE_INFO_ERR_BAD_TYPE  1<<10

/**
 * xmlSchemaNodeInfo:
 *
 * Holds information of an element node.
 */
struct _xmlSchemaNodeInfo {
    int nodeType;
    xmlNodePtr node;
    int nodeLine;    
    const xmlChar *localName;
    const xmlChar *nsName;
    const xmlChar *value;
    xmlSchemaValPtr val; /* the pre-computed value if any */
    xmlSchemaTypePtr typeDef; /* the complex/simple type definition if any */

    int flags; /* combination of node info flags */

    int valNeeded;
    int normVal;

    xmlSchemaElementPtr decl; /* the element/attribute declaration */
    int depth;
    xmlSchemaPSVIIDCBindingPtr idcTable; /* the table of PSVI IDC bindings
                                            for the scope element*/
    xmlSchemaIDCMatcherPtr idcMatchers; /* the IDC matchers for the scope
                                           element */
    xmlRegExecCtxtPtr regexCtxt;

    const xmlChar **nsBindings; /* Namespace bindings on this element */
    int nbNsBindings;
    int sizeNsBindings;    

    int hasKeyrefs;
    int appliedXPath; /* Indicates that an XPath has been applied. */
};

#define XML_SCHEMAS_ATTR_UNKNOWN 1
#define XML_SCHEMAS_ATTR_ASSESSED 2
#define XML_SCHEMAS_ATTR_PROHIBITED 3
#define XML_SCHEMAS_ATTR_ERR_MISSING 4
#define XML_SCHEMAS_ATTR_INVALID_VALUE 5
#define XML_SCHEMAS_ATTR_ERR_NO_TYPE 6
#define XML_SCHEMAS_ATTR_ERR_FIXED_VALUE 7
#define XML_SCHEMAS_ATTR_DEFAULT 8
#define XML_SCHEMAS_ATTR_VALIDATE_VALUE 9
#define XML_SCHEMAS_ATTR_ERR_WILD_STRICT_NO_DECL 10
#define XML_SCHEMAS_ATTR_HAS_ATTR_USE 11
#define XML_SCHEMAS_ATTR_HAS_ATTR_DECL 12
#define XML_SCHEMAS_ATTR_WILD_SKIP 13
#define XML_SCHEMAS_ATTR_WILD_LAX_NO_DECL 14
#define XML_SCHEMAS_ATTR_ERR_WILD_DUPLICATE_ID 15
#define XML_SCHEMAS_ATTR_ERR_WILD_AND_USE_ID 16
#define XML_SCHEMAS_ATTR_META 17
/*
* @metaType values of xmlSchemaAttrInfo.
*/
#define XML_SCHEMA_ATTR_INFO_META_XSI_TYPE 1
#define XML_SCHEMA_ATTR_INFO_META_XSI_NIL 2
#define XML_SCHEMA_ATTR_INFO_META_XSI_SCHEMA_LOC 3
#define XML_SCHEMA_ATTR_INFO_META_XSI_NO_NS_SCHEMA_LOC 4
#define XML_SCHEMA_ATTR_INFO_META_XMLNS 5

typedef struct _xmlSchemaAttrInfo xmlSchemaAttrInfo;
typedef xmlSchemaAttrInfo *xmlSchemaAttrInfoPtr;
struct _xmlSchemaAttrInfo {
    int nodeType;
    xmlNodePtr node;
    int nodeLine;    
    const xmlChar *localName;
    const xmlChar *nsName;
    const xmlChar *value;
    xmlSchemaValPtr val; /* the pre-computed value if any */
    xmlSchemaTypePtr typeDef; /* the complex/simple type definition if any */
    int flags; /* combination of node info flags */

    xmlSchemaAttributePtr decl; /* the attribute declaration */
    xmlSchemaAttributeUsePtr use;  /* the attribute use */
    int state;
    int metaType;
    const xmlChar *vcValue; /* the value constraint value */
    xmlSchemaNodeInfoPtr parent;
};


#define XML_SCHEMA_VALID_CTXT_FLAG_STREAM 1
/**
 * xmlSchemaValidCtxt:
 *
 * A Schemas validation context
 */
struct _xmlSchemaValidCtxt {
    int type;
    void *errCtxt;             /* user specific data block */
    xmlSchemaValidityErrorFunc error;   /* the callback in case of errors */
    xmlSchemaValidityWarningFunc warning; /* the callback in case of warning */
    xmlStructuredErrorFunc serror;

    xmlSchemaPtr schema;        /* The schema in use */
    xmlDocPtr doc;
    xmlParserInputBufferPtr input;
    xmlCharEncoding enc;
    xmlSAXHandlerPtr sax;
    xmlParserCtxtPtr parserCtxt;
    void *user_data; /* TODO: What is this for? */

    int err;
    int nberrors;

    xmlNodePtr node;
    xmlNodePtr cur;
    /* xmlSchemaTypePtr type; */

    xmlRegExecCtxtPtr regexp;
    xmlSchemaValPtr value;

    int valueWS;
    int options;
    xmlNodePtr validationRoot;
    xmlSchemaParserCtxtPtr pctxt;
    int xsiAssemble;

    int depth;
    xmlSchemaNodeInfoPtr *elemInfos; /* array of element informations */
    int sizeElemInfos;
    xmlSchemaNodeInfoPtr inode; /* the current element information */

    xmlSchemaIDCAugPtr aidcs; /* a list of augmented IDC informations */

    xmlSchemaIDCStateObjPtr xpathStates; /* first active state object. */
    xmlSchemaIDCStateObjPtr xpathStatePool; /* first stored state object. */
    xmlSchemaIDCMatcherPtr idcMatcherCache; /* Cache for IDC matcher objects. */

    xmlSchemaPSVIIDCNodePtr *idcNodes; /* list of all IDC node-table entries*/
    int nbIdcNodes;
    int sizeIdcNodes;

    xmlSchemaPSVIIDCKeyPtr *idcKeys; /* list of all IDC node-table entries */
    int nbIdcKeys;
    int sizeIdcKeys;

    int flags;

    xmlDictPtr dict;

#ifdef LIBXML_READER_ENABLED
    xmlTextReaderPtr reader;
#endif

    xmlSchemaAttrInfoPtr *attrInfos;
    int nbAttrInfos;
    int sizeAttrInfos;

    int skipDepth;
    xmlSchemaItemListPtr nodeQNames;
    int hasKeyrefs;
    int createIDCNodeTables;
    int psviExposeIDCNodeTables;
};

/**
 * xmlSchemaSubstGroup:
 *
 *
 */
typedef struct _xmlSchemaSubstGroup xmlSchemaSubstGroup;
typedef xmlSchemaSubstGroup *xmlSchemaSubstGroupPtr;
struct _xmlSchemaSubstGroup {
    xmlSchemaElementPtr head;
    xmlSchemaItemListPtr members;
};

/************************************************************************
 *                                                                      *
 *                      Some predeclarations                            *
 *                                                                      *
 ************************************************************************/

static int xmlSchemaParseInclude(xmlSchemaParserCtxtPtr ctxt,
                                 xmlSchemaPtr schema,
                                 xmlNodePtr node);
static int xmlSchemaParseRedefine(xmlSchemaParserCtxtPtr ctxt,
                                 xmlSchemaPtr schema,
                                 xmlNodePtr node);
static int
xmlSchemaTypeFixup(xmlSchemaTypePtr type,
                   xmlSchemaAbstractCtxtPtr ctxt);
static const xmlChar *
xmlSchemaFacetTypeToString(xmlSchemaTypeType type);
static int
xmlSchemaParseImport(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                     xmlNodePtr node);
static int
xmlSchemaCheckFacetValues(xmlSchemaTypePtr typeDecl,
                       xmlSchemaParserCtxtPtr ctxt);
static void
xmlSchemaClearValidCtxt(xmlSchemaValidCtxtPtr vctxt);
static xmlSchemaWhitespaceValueType
xmlSchemaGetWhiteSpaceFacetValue(xmlSchemaTypePtr type);
static xmlSchemaTreeItemPtr
xmlSchemaParseModelGroup(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                         xmlNodePtr node, xmlSchemaTypeType type,
                         int withParticle);
static const xmlChar *
xmlSchemaGetComponentTypeStr(xmlSchemaBasicItemPtr item);
static xmlSchemaTypeLinkPtr
xmlSchemaGetUnionSimpleTypeMemberTypes(xmlSchemaTypePtr type);
static void
xmlSchemaInternalErr(xmlSchemaAbstractCtxtPtr actxt,
                     const char *funcName,
                     const char *message);
static int
xmlSchemaCheckCOSSTDerivedOK(xmlSchemaAbstractCtxtPtr ctxt,
                             xmlSchemaTypePtr type,
                             xmlSchemaTypePtr baseType,
                             int subset);
static void
xmlSchemaCheckElementDeclComponent(xmlSchemaElementPtr elemDecl,
                                   xmlSchemaParserCtxtPtr ctxt);
static void
xmlSchemaComponentListFree(xmlSchemaItemListPtr list);
static xmlSchemaQNameRefPtr
xmlSchemaParseAttributeGroupRef(xmlSchemaParserCtxtPtr pctxt,
                                xmlSchemaPtr schema,
                                xmlNodePtr node);

/************************************************************************
 *                                                                      *
 *                      Helper functions                                *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSchemaItemTypeToStr:
 * @type: the type of the schema item
 *
 * Returns the component name of a schema item.
 */
static const xmlChar *
xmlSchemaItemTypeToStr(xmlSchemaTypeType type)
{
    switch (type) {
        case XML_SCHEMA_TYPE_BASIC:
            return(BAD_CAST "simple type definition");
        case XML_SCHEMA_TYPE_SIMPLE:
            return(BAD_CAST "simple type definition");
        case XML_SCHEMA_TYPE_COMPLEX:
            return(BAD_CAST "complex type definition");
        case XML_SCHEMA_TYPE_ELEMENT:
            return(BAD_CAST "element declaration");
        case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
            return(BAD_CAST "attribute use");
        case XML_SCHEMA_TYPE_ATTRIBUTE:
            return(BAD_CAST "attribute declaration");
        case XML_SCHEMA_TYPE_GROUP:
            return(BAD_CAST "model group definition");
        case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
            return(BAD_CAST "attribute group definition");
        case XML_SCHEMA_TYPE_NOTATION:
            return(BAD_CAST "notation declaration");
        case XML_SCHEMA_TYPE_SEQUENCE:
            return(BAD_CAST "model group (sequence)");
        case XML_SCHEMA_TYPE_CHOICE:
            return(BAD_CAST "model group (choice)");
        case XML_SCHEMA_TYPE_ALL:
            return(BAD_CAST "model group (all)");
        case XML_SCHEMA_TYPE_PARTICLE:
            return(BAD_CAST "particle");
        case XML_SCHEMA_TYPE_IDC_UNIQUE:
            return(BAD_CAST "unique identity-constraint");
            /* return(BAD_CAST "IDC (unique)"); */
        case XML_SCHEMA_TYPE_IDC_KEY:
            return(BAD_CAST "key identity-constraint");
            /* return(BAD_CAST "IDC (key)"); */
        case XML_SCHEMA_TYPE_IDC_KEYREF:
            return(BAD_CAST "keyref identity-constraint");
            /* return(BAD_CAST "IDC (keyref)"); */
        case XML_SCHEMA_TYPE_ANY:
            return(BAD_CAST "wildcard (any)");
        case XML_SCHEMA_EXTRA_QNAMEREF:
            return(BAD_CAST "[helper component] QName reference");
        case XML_SCHEMA_EXTRA_ATTR_USE_PROHIB:
            return(BAD_CAST "[helper component] attribute use prohibition");
        default:
            return(BAD_CAST "Not a schema component");
    }
}

/**
 * xmlSchemaGetComponentTypeStr:
 * @type: the type of the schema item
 *
 * Returns the component name of a schema item.
 */
static const xmlChar *
xmlSchemaGetComponentTypeStr(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
        case XML_SCHEMA_TYPE_BASIC:
            if (WXS_IS_COMPLEX(WXS_TYPE_CAST item))
                return(BAD_CAST "complex type definition");
            else
                return(BAD_CAST "simple type definition");      
        default:
            return(xmlSchemaItemTypeToStr(item->type));
    }
}

/**
 * xmlSchemaGetComponentNode:
 * @item: a schema component
 *
 * Returns node associated with the schema component.
 * NOTE that such a node need not be available; plus, a component's
 * node need not to reflect the component directly, since there is no
 * one-to-one relationship between the XML Schema representation and
 * the component representation.
 */
static xmlNodePtr
xmlSchemaGetComponentNode(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
        case XML_SCHEMA_TYPE_ELEMENT:
            return (((xmlSchemaElementPtr) item)->node);
        case XML_SCHEMA_TYPE_ATTRIBUTE:
            return (((xmlSchemaAttributePtr) item)->node);
        case XML_SCHEMA_TYPE_COMPLEX:
        case XML_SCHEMA_TYPE_SIMPLE:
            return (((xmlSchemaTypePtr) item)->node);
        case XML_SCHEMA_TYPE_ANY:
        case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
            return (((xmlSchemaWildcardPtr) item)->node);
        case XML_SCHEMA_TYPE_PARTICLE:
            return (((xmlSchemaParticlePtr) item)->node);
        case XML_SCHEMA_TYPE_SEQUENCE:
        case XML_SCHEMA_TYPE_CHOICE:
        case XML_SCHEMA_TYPE_ALL:
            return (((xmlSchemaModelGroupPtr) item)->node);
        case XML_SCHEMA_TYPE_GROUP:
            return (((xmlSchemaModelGroupDefPtr) item)->node);
        case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
            return (((xmlSchemaAttributeGroupPtr) item)->node);
        case XML_SCHEMA_TYPE_IDC_UNIQUE:
        case XML_SCHEMA_TYPE_IDC_KEY:
        case XML_SCHEMA_TYPE_IDC_KEYREF:
            return (((xmlSchemaIDCPtr) item)->node);
        case XML_SCHEMA_EXTRA_QNAMEREF:
            return(((xmlSchemaQNameRefPtr) item)->node);
        /* TODO: What to do with NOTATIONs?
        case XML_SCHEMA_TYPE_NOTATION:
            return (((xmlSchemaNotationPtr) item)->node);
        */
        case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
            return (((xmlSchemaAttributeUsePtr) item)->node);
        default:
            return (NULL);
    }
}

#if 0
/**
 * xmlSchemaGetNextComponent:
 * @item: a schema component
 *
 * Returns the next sibling of the schema component.
 */
static xmlSchemaBasicItemPtr
xmlSchemaGetNextComponent(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
        case XML_SCHEMA_TYPE_ELEMENT:
            return ((xmlSchemaBasicItemPtr) ((xmlSchemaElementPtr) item)->next);
        case XML_SCHEMA_TYPE_ATTRIBUTE:
            return ((xmlSchemaBasicItemPtr) ((xmlSchemaAttributePtr) item)->next);
        case XML_SCHEMA_TYPE_COMPLEX:
        case XML_SCHEMA_TYPE_SIMPLE:
            return ((xmlSchemaBasicItemPtr) ((xmlSchemaTypePtr) item)->next);
        case XML_SCHEMA_TYPE_ANY:
        case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
            return (NULL);
        case XML_SCHEMA_TYPE_PARTICLE:
            return ((xmlSchemaBasicItemPtr) ((xmlSchemaParticlePtr) item)->next);
        case XML_SCHEMA_TYPE_SEQUENCE:
        case XML_SCHEMA_TYPE_CHOICE:
        case XML_SCHEMA_TYPE_ALL:
            return (NULL);
        case XML_SCHEMA_TYPE_GROUP:
            return (NULL);
        case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
            return ((xmlSchemaBasicItemPtr) ((xmlSchemaAttributeGroupPtr) item)->next);
        case XML_SCHEMA_TYPE_IDC_UNIQUE:
        case XML_SCHEMA_TYPE_IDC_KEY:
        case XML_SCHEMA_TYPE_IDC_KEYREF:
            return ((xmlSchemaBasicItemPtr) ((xmlSchemaIDCPtr) item)->next);
        default:
            return (NULL);
    }
}
#endif


/**
 * xmlSchemaFormatQName:
 * @buf: the string buffer
 * @namespaceName:  the namespace name
 * @localName: the local name
 *
 * Returns the given QName in the format "{namespaceName}localName" or
 * just "localName" if @namespaceName is NULL.
 *
 * Returns the localName if @namespaceName is NULL, a formatted
 * string otherwise.
 */
static const xmlChar*
xmlSchemaFormatQName(xmlChar **buf,
                     const xmlChar *namespaceName,
                     const xmlChar *localName)
{
    FREE_AND_NULL(*buf)
    if (namespaceName != NULL) {
        *buf = xmlStrdup(BAD_CAST "{");
        *buf = xmlStrcat(*buf, namespaceName);
        *buf = xmlStrcat(*buf, BAD_CAST "}");
    }
    if (localName != NULL) {
        if (namespaceName == NULL)
            return(localName);
        *buf = xmlStrcat(*buf, localName);
    } else {
        *buf = xmlStrcat(*buf, BAD_CAST "(NULL)");
    }    
    return ((const xmlChar *) *buf);
}

static const xmlChar*   
xmlSchemaFormatQNameNs(xmlChar **buf, xmlNsPtr ns, const xmlChar *localName)
{
    if (ns != NULL)
        return (xmlSchemaFormatQName(buf, ns->href, localName));
    else
        return (xmlSchemaFormatQName(buf, NULL, localName));
}

static const xmlChar *
xmlSchemaGetComponentName(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
        case XML_SCHEMA_TYPE_ELEMENT:
            return (((xmlSchemaElementPtr) item)->name);
        case XML_SCHEMA_TYPE_ATTRIBUTE:
            return (((xmlSchemaAttributePtr) item)->name);
        case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
            return (((xmlSchemaAttributeGroupPtr) item)->name);
        case XML_SCHEMA_TYPE_BASIC:
        case XML_SCHEMA_TYPE_SIMPLE:
        case XML_SCHEMA_TYPE_COMPLEX:
            return (((xmlSchemaTypePtr) item)->name);
        case XML_SCHEMA_TYPE_GROUP:
            return (((xmlSchemaModelGroupDefPtr) item)->name);
        case XML_SCHEMA_TYPE_IDC_KEY:
        case XML_SCHEMA_TYPE_IDC_UNIQUE:
        case XML_SCHEMA_TYPE_IDC_KEYREF:
            return (((xmlSchemaIDCPtr) item)->name);
        case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
            if (WXS_ATTRUSE_DECL(item) != NULL) {
                return(xmlSchemaGetComponentName(
                    WXS_BASIC_CAST WXS_ATTRUSE_DECL(item)));
            } else
                return(NULL);
        case XML_SCHEMA_EXTRA_QNAMEREF:
            return (((xmlSchemaQNameRefPtr) item)->name);
        case XML_SCHEMA_TYPE_NOTATION:
            return (((xmlSchemaNotationPtr) item)->name);
        default:
            /*
            * Other components cannot have names.
            */
            break;
    }
    return (NULL);
}

#define xmlSchemaGetQNameRefName(r) (WXS_QNAME_CAST (r))->name
#define xmlSchemaGetQNameRefTargetNs(r) (WXS_QNAME_CAST (r))->targetNamespace
/*
static const xmlChar *
xmlSchemaGetQNameRefName(void *ref)
{
    return(((xmlSchemaQNameRefPtr) ref)->name);
}

static const xmlChar *
xmlSchemaGetQNameRefTargetNs(void *ref)
{
    return(((xmlSchemaQNameRefPtr) ref)->targetNamespace);
}
*/

static const xmlChar *
xmlSchemaGetComponentTargetNs(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
        case XML_SCHEMA_TYPE_ELEMENT:
            return (((xmlSchemaElementPtr) item)->targetNamespace);
        case XML_SCHEMA_TYPE_ATTRIBUTE:
            return (((xmlSchemaAttributePtr) item)->targetNamespace);
        case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
            return (((xmlSchemaAttributeGroupPtr) item)->targetNamespace);
        case XML_SCHEMA_TYPE_BASIC:
            return (BAD_CAST "http://www.w3.org/2001/XMLSchema");
        case XML_SCHEMA_TYPE_SIMPLE:
        case XML_SCHEMA_TYPE_COMPLEX:
            return (((xmlSchemaTypePtr) item)->targetNamespace);
        case XML_SCHEMA_TYPE_GROUP:
            return (((xmlSchemaModelGroupDefPtr) item)->targetNamespace);
        case XML_SCHEMA_TYPE_IDC_KEY:
        case XML_SCHEMA_TYPE_IDC_UNIQUE:
        case XML_SCHEMA_TYPE_IDC_KEYREF:
            return (((xmlSchemaIDCPtr) item)->targetNamespace);
        case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
            if (WXS_ATTRUSE_DECL(item) != NULL) {
                return(xmlSchemaGetComponentTargetNs(
                    WXS_BASIC_CAST WXS_ATTRUSE_DECL(item)));
            }
            /* TODO: Will returning NULL break something? */
            break;
        case XML_SCHEMA_EXTRA_QNAMEREF:
            return (((xmlSchemaQNameRefPtr) item)->targetNamespace);
        case XML_SCHEMA_TYPE_NOTATION:
            return (((xmlSchemaNotationPtr) item)->targetNamespace);
        default:
            /*
            * Other components cannot have names.
            */
            break;
    }
    return (NULL);
}

static const xmlChar*
xmlSchemaGetComponentQName(xmlChar **buf,
                           void *item)
{
    return (xmlSchemaFormatQName(buf,
        xmlSchemaGetComponentTargetNs((xmlSchemaBasicItemPtr) item),
        xmlSchemaGetComponentName((xmlSchemaBasicItemPtr) item)));
}

static const xmlChar*
xmlSchemaGetComponentDesignation(xmlChar **buf, void *item)
{
    xmlChar *str = NULL;

    *buf = xmlStrcat(*buf, WXS_ITEM_TYPE_NAME(item));
    *buf = xmlStrcat(*buf, BAD_CAST " '");
    *buf = xmlStrcat(*buf, xmlSchemaGetComponentQName(&str,
        (xmlSchemaBasicItemPtr) item));
    *buf = xmlStrcat(*buf, BAD_CAST "'");
    FREE_AND_NULL(str);
    return(*buf);
}

static const xmlChar*
xmlSchemaGetIDCDesignation(xmlChar **buf, xmlSchemaIDCPtr idc)
{
    return(xmlSchemaGetComponentDesignation(buf, idc));
}

/**
 * xmlSchemaWildcardPCToString:
 * @pc: the type of processContents
 *
 * Returns a string representation of the type of
 * processContents.
 */
static const xmlChar *
xmlSchemaWildcardPCToString(int pc)
{
    switch (pc) {
        case XML_SCHEMAS_ANY_SKIP:
            return (BAD_CAST "skip");
        case XML_SCHEMAS_ANY_LAX:
            return (BAD_CAST "lax");
        case XML_SCHEMAS_ANY_STRICT:
            return (BAD_CAST "strict");
        default:
            return (BAD_CAST "invalid process contents");
    }
}

/**
 * xmlSchemaGetCanonValueWhtspExt:
 * @val: the precomputed value
 * @retValue: the returned value
 * @ws: the whitespace type of the value
 *
 * Get a the cononical representation of the value.
 * The caller has to free the returned retValue.
 *
 * Returns 0 if the value could be built and -1 in case of
 *         API errors or if the value type is not supported yet.
 */
static int
xmlSchemaGetCanonValueWhtspExt(xmlSchemaValPtr val,
                               xmlSchemaWhitespaceValueType ws,
                               xmlChar **retValue)
{
    int list;
    xmlSchemaValType valType;
    const xmlChar *value, *value2 = NULL;
    

    if ((retValue == NULL) || (val == NULL))
        return (-1);
    list = xmlSchemaValueGetNext(val) ? 1 : 0;
    *retValue = NULL;
    do {
        value = NULL;   
        valType = xmlSchemaGetValType(val);    
        switch (valType) {          
            case XML_SCHEMAS_STRING:
            case XML_SCHEMAS_NORMSTRING:
            case XML_SCHEMAS_ANYSIMPLETYPE:
                value = xmlSchemaValueGetAsString(val);
                if (value != NULL) {
                    if (ws == XML_SCHEMA_WHITESPACE_COLLAPSE)
                        value2 = xmlSchemaCollapseString(value);
                    else if (ws == XML_SCHEMA_WHITESPACE_REPLACE)
                        value2 = xmlSchemaWhiteSpaceReplace(value);
                    if (value2 != NULL)
                        value = value2;
                }
                break;     
            default:
                if (xmlSchemaGetCanonValue(val, &value2) == -1) {
                    if (value2 != NULL)
                        xmlFree((xmlChar *) value2);
                    goto internal_error;
                }
                value = value2;
        }
        if (*retValue == NULL)
            if (value == NULL) {
                if (! list)
                    *retValue = xmlStrdup(BAD_CAST "");
            } else
                *retValue = xmlStrdup(value);
        else if (value != NULL) {
            /* List. */
            *retValue = xmlStrcat((xmlChar *) *retValue, BAD_CAST " ");
            *retValue = xmlStrcat((xmlChar *) *retValue, value);
        }
        FREE_AND_NULL(value2)
        val = xmlSchemaValueGetNext(val);
    } while (val != NULL);

    return (0);
internal_error:
    if (*retValue != NULL)
        xmlFree((xmlChar *) (*retValue));
    if (value2 != NULL)
        xmlFree((xmlChar *) value2);
    return (-1);
}

/**
 * xmlSchemaFormatItemForReport:
 * @buf: the string buffer
 * @itemDes: the designation of the item
 * @itemName: the name of the item
 * @item: the item as an object 
 * @itemNode: the node of the item
 * @local: the local name
 * @parsing: if the function is used during the parse
 *
 * Returns a representation of the given item used
 * for error reports. 
 *
 * The following order is used to build the resulting 
 * designation if the arguments are not NULL:
 * 1a. If itemDes not NULL -> itemDes
 * 1b. If (itemDes not NULL) and (itemName not NULL)
 *     -> itemDes + itemName
 * 2. If the preceding was NULL and (item not NULL) -> item
 * 3. If the preceding was NULL and (itemNode not NULL) -> itemNode
 * 
 * If the itemNode is an attribute node, the name of the attribute
 * will be appended to the result.
 *
 * Returns the formatted string and sets @buf to the resulting value.
 */  
static xmlChar*   
xmlSchemaFormatItemForReport(xmlChar **buf,                  
                     const xmlChar *itemDes,
                     xmlSchemaBasicItemPtr item,
                     xmlNodePtr itemNode)
{
    xmlChar *str = NULL;
    int named = 1;

    if (*buf != NULL) {
        xmlFree(*buf);
        *buf = NULL;
    }
            
    if (itemDes != NULL) {
        *buf = xmlStrdup(itemDes);      
    } else if (item != NULL) {
        switch (item->type) {
        case XML_SCHEMA_TYPE_BASIC: {
            xmlSchemaTypePtr type = WXS_TYPE_CAST item;

            if (WXS_IS_ATOMIC(type))
                *buf = xmlStrdup(BAD_CAST "atomic type 'xs:");
            else if (WXS_IS_LIST(type))
                *buf = xmlStrdup(BAD_CAST "list type 'xs:");
            else if (WXS_IS_UNION(type))
                *buf = xmlStrdup(BAD_CAST "union type 'xs:");
            else
                *buf = xmlStrdup(BAD_CAST "simple type 'xs:");
            *buf = xmlStrcat(*buf, type->name);
            *buf = xmlStrcat(*buf, BAD_CAST "'");
            }
            break;
        case XML_SCHEMA_TYPE_SIMPLE: {
            xmlSchemaTypePtr type = WXS_TYPE_CAST item;

            if (type->flags & XML_SCHEMAS_TYPE_GLOBAL) {
                *buf = xmlStrdup(BAD_CAST"");
            } else {
                *buf = xmlStrdup(BAD_CAST "local ");
            }
            if (WXS_IS_ATOMIC(type))
                *buf = xmlStrcat(*buf, BAD_CAST "atomic type");
            else if (WXS_IS_LIST(type))
                *buf = xmlStrcat(*buf, BAD_CAST "list type");
            else if (WXS_IS_UNION(type))
                *buf = xmlStrcat(*buf, BAD_CAST "union type");
            else
                *buf = xmlStrcat(*buf, BAD_CAST "simple type");
            if (type->flags & XML_SCHEMAS_TYPE_GLOBAL) {
                *buf = xmlStrcat(*buf, BAD_CAST " '");
                *buf = xmlStrcat(*buf, type->name);
                *buf = xmlStrcat(*buf, BAD_CAST "'");
            }
            }
            break;
        case XML_SCHEMA_TYPE_COMPLEX: {
            xmlSchemaTypePtr type = WXS_TYPE_CAST item;

            if (type->flags & XML_SCHEMAS_TYPE_GLOBAL)
                *buf = xmlStrdup(BAD_CAST "");
            else
                *buf = xmlStrdup(BAD_CAST "local ");
            *buf = xmlStrcat(*buf, BAD_CAST "complex type");
            if (type->flags & XML_SCHEMAS_TYPE_GLOBAL) {
                *buf = xmlStrcat(*buf, BAD_CAST " '");
                *buf = xmlStrcat(*buf, type->name);
                *buf = xmlStrcat(*buf, BAD_CAST "'");
            }
            }
            break;
        case XML_SCHEMA_TYPE_ATTRIBUTE_USE: {
                xmlSchemaAttributeUsePtr ause;
            
                ause = WXS_ATTR_USE_CAST item;
                *buf = xmlStrdup(BAD_CAST "attribute use ");
                if (WXS_ATTRUSE_DECL(ause) != NULL) {
                    *buf = xmlStrcat(*buf, BAD_CAST "'");
                    *buf = xmlStrcat(*buf,
                        xmlSchemaGetComponentQName(&str, WXS_ATTRUSE_DECL(ause)));
                    FREE_AND_NULL(str)
                        *buf = xmlStrcat(*buf, BAD_CAST "'");
                } else {
                    *buf = xmlStrcat(*buf, BAD_CAST "(unknown)");
                }
            }
            break;
        case XML_SCHEMA_TYPE_ATTRIBUTE: {
                xmlSchemaAttributePtr attr;
            
                attr = (xmlSchemaAttributePtr) item;
                *buf = xmlStrdup(BAD_CAST "attribute decl.");
                *buf = xmlStrcat(*buf, BAD_CAST " '");
                *buf = xmlStrcat(*buf, xmlSchemaFormatQName(&str,
                    attr->targetNamespace, attr->name));
                FREE_AND_NULL(str)
                    *buf = xmlStrcat(*buf, BAD_CAST "'");
            }
            break;
        case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
            xmlSchemaGetComponentDesignation(buf, item);
            break;
        case XML_SCHEMA_TYPE_ELEMENT: {
                xmlSchemaElementPtr elem;

                elem = (xmlSchemaElementPtr) item;          
                *buf = xmlStrdup(BAD_CAST "element decl.");
                *buf = xmlStrcat(*buf, BAD_CAST " '");
                *buf = xmlStrcat(*buf, xmlSchemaFormatQName(&str,
                    elem->targetNamespace, elem->name));
                *buf = xmlStrcat(*buf, BAD_CAST "'");
            }
            break;
        case XML_SCHEMA_TYPE_IDC_UNIQUE:
        case XML_SCHEMA_TYPE_IDC_KEY:
        case XML_SCHEMA_TYPE_IDC_KEYREF:                
            if (item->type == XML_SCHEMA_TYPE_IDC_UNIQUE)
                *buf = xmlStrdup(BAD_CAST "unique '");
            else if (item->type == XML_SCHEMA_TYPE_IDC_KEY)
                *buf = xmlStrdup(BAD_CAST "key '");
            else
                *buf = xmlStrdup(BAD_CAST "keyRef '");
            *buf = xmlStrcat(*buf, ((xmlSchemaIDCPtr) item)->name);
            *buf = xmlStrcat(*buf, BAD_CAST "'");
            break;
        case XML_SCHEMA_TYPE_ANY:
        case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
            *buf = xmlStrdup(xmlSchemaWildcardPCToString(
                    ((xmlSchemaWildcardPtr) item)->processContents));
            *buf = xmlStrcat(*buf, BAD_CAST " wildcard");
            break;
        case XML_SCHEMA_FACET_MININCLUSIVE:
        case XML_SCHEMA_FACET_MINEXCLUSIVE:
        case XML_SCHEMA_FACET_MAXINCLUSIVE:
        case XML_SCHEMA_FACET_MAXEXCLUSIVE:
        case XML_SCHEMA_FACET_TOTALDIGITS:
        case XML_SCHEMA_FACET_FRACTIONDIGITS:
        case XML_SCHEMA_FACET_PATTERN:
        case XML_SCHEMA_FACET_ENUMERATION:
        case XML_SCHEMA_FACET_WHITESPACE:
        case XML_SCHEMA_FACET_LENGTH:
        case XML_SCHEMA_FACET_MAXLENGTH:
        case XML_SCHEMA_FACET_MINLENGTH:
            *buf = xmlStrdup(BAD_CAST "facet '");
            *buf = xmlStrcat(*buf, xmlSchemaFacetTypeToString(item->type));
            *buf = xmlStrcat(*buf, BAD_CAST "'");
            break;
        case XML_SCHEMA_TYPE_GROUP: {
                *buf = xmlStrdup(BAD_CAST "model group def.");
                *buf = xmlStrcat(*buf, BAD_CAST " '");
                *buf = xmlStrcat(*buf, xmlSchemaGetComponentQName(&str, item));
                *buf = xmlStrcat(*buf, BAD_CAST "'");
                FREE_AND_NULL(str)
            }
            break;
        case XML_SCHEMA_TYPE_SEQUENCE:
        case XML_SCHEMA_TYPE_CHOICE:
        case XML_SCHEMA_TYPE_ALL:
        case XML_SCHEMA_TYPE_PARTICLE:
            *buf = xmlStrdup(WXS_ITEM_TYPE_NAME(item));
            break;
        case XML_SCHEMA_TYPE_NOTATION: {
                *buf = xmlStrdup(WXS_ITEM_TYPE_NAME(item));
                *buf = xmlStrcat(*buf, BAD_CAST " '");
                *buf = xmlStrcat(*buf, xmlSchemaGetComponentQName(&str, item));
                *buf = xmlStrcat(*buf, BAD_CAST "'");
                FREE_AND_NULL(str);
            }
        default:
            named = 0;
        }
    } else 
        named = 0;

    if ((named == 0) && (itemNode != NULL)) {
        xmlNodePtr elem;

        if (itemNode->type == XML_ATTRIBUTE_NODE)
            elem = itemNode->parent;
        else 
            elem = itemNode;
        *buf = xmlStrdup(BAD_CAST "Element '");
        if (elem->ns != NULL) {
            *buf = xmlStrcat(*buf,
                xmlSchemaFormatQName(&str, elem->ns->href, elem->name));
            FREE_AND_NULL(str)
        } else
            *buf = xmlStrcat(*buf, elem->name);
        *buf = xmlStrcat(*buf, BAD_CAST "'");
        
    }
    if ((itemNode != NULL) && (itemNode->type == XML_ATTRIBUTE_NODE)) {
        *buf = xmlStrcat(*buf, BAD_CAST ", attribute '");
        if (itemNode->ns != NULL) {
            *buf = xmlStrcat(*buf, xmlSchemaFormatQName(&str,
                itemNode->ns->href, itemNode->name));
            FREE_AND_NULL(str)
        } else
            *buf = xmlStrcat(*buf, itemNode->name);
        *buf = xmlStrcat(*buf, BAD_CAST "'");
    }
    FREE_AND_NULL(str)
    
    return (*buf);
}

/**
 * xmlSchemaFormatFacetEnumSet:
 * @buf: the string buffer
 * @type: the type holding the enumeration facets
 *
 * Builds a string consisting of all enumeration elements.
 *
 * Returns a string of all enumeration elements.
 */
static const xmlChar *
xmlSchemaFormatFacetEnumSet(xmlSchemaAbstractCtxtPtr actxt,
                            xmlChar **buf, xmlSchemaTypePtr type)
{
    xmlSchemaFacetPtr facet;
    xmlSchemaWhitespaceValueType ws;
    xmlChar *value = NULL;
    int res, found = 0;

    if (*buf != NULL)
        xmlFree(*buf);    
    *buf = NULL;

    do {
        /*
        * Use the whitespace type of the base type.
        */      
        ws = xmlSchemaGetWhiteSpaceFacetValue(type->baseType);
        for (facet = type->facets; facet != NULL; facet = facet->next) {
            if (facet->type != XML_SCHEMA_FACET_ENUMERATION)
                continue;
            found = 1;
            res = xmlSchemaGetCanonValueWhtspExt(facet->val,
                ws, &value);
            if (res == -1) {
                xmlSchemaInternalErr(actxt,
                    "xmlSchemaFormatFacetEnumSet",
                    "compute the canonical lexical representation");
                if (*buf != NULL)
                    xmlFree(*buf);
                *buf = NULL;
                return (NULL);
            }
            if (*buf == NULL)
                *buf = xmlStrdup(BAD_CAST "'");
            else
                *buf = xmlStrcat(*buf, BAD_CAST ", '");
            *buf = xmlStrcat(*buf, BAD_CAST value);
            *buf = xmlStrcat(*buf, BAD_CAST "'");
            if (value != NULL) {
                xmlFree((xmlChar *)value);
                value = NULL;
            }
        }
        /*
        * The enumeration facet of a type restricts the enumeration
        * facet of the ancestor type; i.e., such restricted enumerations
        * do not belong to the set of the given type. Thus we break
        * on the first found enumeration.
        */
        if (found)
            break;
        type = type->baseType;
    } while ((type != NULL) && (type->type != XML_SCHEMA_TYPE_BASIC));

    return ((const xmlChar *) *buf);
}

/************************************************************************
 *                                                                      *
 *                      Error functions                                 *
 *                                                                      *
 ************************************************************************/

#if 0
static void
xmlSchemaErrMemory(const char *msg)
{
    __xmlSimpleError(XML_FROM_SCHEMASP, XML_ERR_NO_MEMORY, NULL, NULL,
                     msg);
}
#endif

static void
xmlSchemaPSimpleErr(const char *msg)
{
    __xmlSimpleError(XML_FROM_SCHEMASP, XML_ERR_NO_MEMORY, NULL, NULL,
                     msg);
}

/**
 * xmlSchemaPErrMemory:
 * @node: a context node
 * @extra:  extra informations
 *
 * Handle an out of memory condition
 */
static void
xmlSchemaPErrMemory(xmlSchemaParserCtxtPtr ctxt,
                    const char *extra, xmlNodePtr node)
{
    if (ctxt != NULL)
        ctxt->nberrors++;
    __xmlSimpleError(XML_FROM_SCHEMASP, XML_ERR_NO_MEMORY, node, NULL,
                     extra);
}

/**
 * xmlSchemaPErr:
 * @ctxt: the parsing context
 * @node: the context node
 * @error: the error code
 * @msg: the error message
 * @str1: extra data
 * @str2: extra data
 * 
 * Handle a parser error
 */
static void
xmlSchemaPErr(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node, int error,
              const char *msg, const xmlChar * str1, const xmlChar * str2)
{
    xmlGenericErrorFunc channel = NULL;
    xmlStructuredErrorFunc schannel = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        ctxt->nberrors++;
        ctxt->err = error;
        channel = ctxt->error;
        data = ctxt->errCtxt;
        schannel = ctxt->serror;
    }
    __xmlRaiseError(schannel, channel, data, ctxt, node, XML_FROM_SCHEMASP,
                    error, XML_ERR_ERROR, NULL, 0,
                    (const char *) str1, (const char *) str2, NULL, 0, 0,
                    msg, str1, str2);
}

/**
 * xmlSchemaPErr2:
 * @ctxt: the parsing context
 * @node: the context node
 * @node: the current child
 * @error: the error code
 * @msg: the error message
 * @str1: extra data
 * @str2: extra data
 * 
 * Handle a parser error
 */
static void
xmlSchemaPErr2(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node,
               xmlNodePtr child, int error,
               const char *msg, const xmlChar * str1, const xmlChar * str2)
{
    if (child != NULL)
        xmlSchemaPErr(ctxt, child, error, msg, str1, str2);
    else
        xmlSchemaPErr(ctxt, node, error, msg, str1, str2);
}


/**
 * xmlSchemaPErrExt:
 * @ctxt: the parsing context
 * @node: the context node
 * @error: the error code 
 * @strData1: extra data
 * @strData2: extra data
 * @strData3: extra data
 * @msg: the message
 * @str1:  extra parameter for the message display
 * @str2:  extra parameter for the message display
 * @str3:  extra parameter for the message display
 * @str4:  extra parameter for the message display
 * @str5:  extra parameter for the message display
 * 
 * Handle a parser error
 */
static void
xmlSchemaPErrExt(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node, int error,
                const xmlChar * strData1, const xmlChar * strData2, 
                const xmlChar * strData3, const char *msg, const xmlChar * str1, 
                const xmlChar * str2, const xmlChar * str3, const xmlChar * str4,
                const xmlChar * str5)
{

    xmlGenericErrorFunc channel = NULL;
    xmlStructuredErrorFunc schannel = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        ctxt->nberrors++;
        ctxt->err = error;
        channel = ctxt->error;
        data = ctxt->errCtxt;
        schannel = ctxt->serror;
    }
    __xmlRaiseError(schannel, channel, data, ctxt, node, XML_FROM_SCHEMASP,
                    error, XML_ERR_ERROR, NULL, 0,
                    (const char *) strData1, (const char *) strData2, 
                    (const char *) strData3, 0, 0, msg, str1, str2, 
                    str3, str4, str5);
}

/************************************************************************
 *                                                                      *
 *                      Allround error functions                        *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSchemaVTypeErrMemory:
 * @node: a context node
 * @extra:  extra informations
 *
 * Handle an out of memory condition
 */
static void
xmlSchemaVErrMemory(xmlSchemaValidCtxtPtr ctxt,
                    const char *extra, xmlNodePtr node)
{
    if (ctxt != NULL) {
        ctxt->nberrors++;
        ctxt->err = XML_SCHEMAV_INTERNAL;
    }
    __xmlSimpleError(XML_FROM_SCHEMASV, XML_ERR_NO_MEMORY, node, NULL,
                     extra);
}

static void
xmlSchemaPSimpleInternalErr(xmlNodePtr node,
                            const char *msg, const xmlChar *str)
{
     __xmlSimpleError(XML_FROM_SCHEMASP, XML_SCHEMAP_INTERNAL, node,
         msg, (const char *) str);
}

#define WXS_ERROR_TYPE_ERROR 1
#define WXS_ERROR_TYPE_WARNING 2
/**
 * xmlSchemaErr3:
 * @ctxt: the validation context
 * @node: the context node
 * @error: the error code
 * @msg: the error message
 * @str1: extra data
 * @str2: extra data
 * @str3: extra data
 * 
 * Handle a validation error
 */
static void
xmlSchemaErr4Line(xmlSchemaAbstractCtxtPtr ctxt,
                  xmlErrorLevel errorLevel,
                  int error, xmlNodePtr node, int line, const char *msg,
                  const xmlChar *str1, const xmlChar *str2,
                  const xmlChar *str3, const xmlChar *str4)
{
    xmlStructuredErrorFunc schannel = NULL;
    xmlGenericErrorFunc channel = NULL;
    void *data = NULL;    
    
    if (ctxt != NULL) {
        if (ctxt->type == XML_SCHEMA_CTXT_VALIDATOR) {
            xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) ctxt;
            const char *file = NULL;
            if (errorLevel != XML_ERR_WARNING) {
                vctxt->nberrors++;
                vctxt->err = error;
                channel = vctxt->error;         
            } else {
                channel = vctxt->warning;
            }
            schannel = vctxt->serror;
            data = vctxt->errCtxt;

            /*
            * Error node. If we specify a line number, then
            * do not channel any node to the error function.
            */
            if (line == 0) {
                if ((node == NULL) &&
                    (vctxt->depth >= 0) &&
                    (vctxt->inode != NULL)) {
                    node = vctxt->inode->node;
                }
                /*
                * Get filename and line if no node-tree.
                */
                if ((node == NULL) &&
                    (vctxt->parserCtxt != NULL) &&
                    (vctxt->parserCtxt->input != NULL)) {
                    file = vctxt->parserCtxt->input->filename;
                    line = vctxt->parserCtxt->input->line;
                }
            } else {
                /*
                * Override the given node's (if any) position
                * and channel only the given line number.
                */
                node = NULL;
                /*
                * Get filename.
                */
                if (vctxt->doc != NULL)
                    file = (const char *) vctxt->doc->URL;
                else if ((vctxt->parserCtxt != NULL) &&
                    (vctxt->parserCtxt->input != NULL))
                    file = vctxt->parserCtxt->input->filename;
            }          
            __xmlRaiseError(schannel, channel, data, ctxt,
                node, XML_FROM_SCHEMASV,
                error, errorLevel, file, line,
                (const char *) str1, (const char *) str2,
                (const char *) str3, 0, 0, msg, str1, str2, str3, str4);

        } else if (ctxt->type == XML_SCHEMA_CTXT_PARSER) {
            xmlSchemaParserCtxtPtr pctxt = (xmlSchemaParserCtxtPtr) ctxt;
            if (errorLevel != XML_ERR_WARNING) {
                pctxt->nberrors++;
                pctxt->err = error;
                channel = pctxt->error;         
            } else {
                channel = pctxt->warning;
            }
            schannel = pctxt->serror;
            data = pctxt->errCtxt;
            __xmlRaiseError(schannel, channel, data, ctxt,
                node, XML_FROM_SCHEMASP, error,
                errorLevel, NULL, 0,
                (const char *) str1, (const char *) str2,
                (const char *) str3, 0, 0, msg, str1, str2, str3, str4);
        } else {
            TODO
        }
    }
}

/**
 * xmlSchemaErr3:
 * @ctxt: the validation context
 * @node: the context node
 * @error: the error code
 * @msg: the error message
 * @str1: extra data
 * @str2: extra data
 * @str3: extra data
 * 
 * Handle a validation error
 */
static void
xmlSchemaErr3(xmlSchemaAbstractCtxtPtr actxt,  
              int error, xmlNodePtr node, const char *msg,
              const xmlChar *str1, const xmlChar *str2, const xmlChar *str3)
{
    xmlSchemaErr4Line(actxt, XML_ERR_ERROR, error, node, 0,
        msg, str1, str2, str3, NULL);
}

static void
xmlSchemaErr4(xmlSchemaAbstractCtxtPtr actxt,  
              int error, xmlNodePtr node, const char *msg,
              const xmlChar *str1, const xmlChar *str2,
              const xmlChar *str3, const xmlChar *str4)
{
    xmlSchemaErr4Line(actxt, XML_ERR_ERROR, error, node, 0,
        msg, str1, str2, str3, str4);
}

static void
xmlSchemaErr(xmlSchemaAbstractCtxtPtr actxt,
             int error, xmlNodePtr node, const char *msg,
             const xmlChar *str1, const xmlChar *str2)
{
    xmlSchemaErr4(actxt, error, node, msg, str1, str2, NULL, NULL);
}

static xmlChar *
xmlSchemaFormatNodeForError(xmlChar ** msg,
                            xmlSchemaAbstractCtxtPtr actxt,
                            xmlNodePtr node)
{
    xmlChar *str = NULL;

    *msg = NULL;
    if ((node != NULL) &&
        (node->type != XML_ELEMENT_NODE) &&
        (node->type != XML_ATTRIBUTE_NODE))
    {
        /* 
        * Don't try to format other nodes than element and
        * attribute nodes.
        * Play save and return an empty string.
        */
        *msg = xmlStrdup(BAD_CAST "");
        return(*msg);
    }
    if (node != NULL) {
        /*
        * Work on tree nodes.
        */
        if (node->type == XML_ATTRIBUTE_NODE) {
            xmlNodePtr elem = node->parent;
            
            *msg = xmlStrdup(BAD_CAST "Element '");
            if (elem->ns != NULL)
                *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
                    elem->ns->href, elem->name));
            else
                *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
                    NULL, elem->name));
            FREE_AND_NULL(str);
            *msg = xmlStrcat(*msg, BAD_CAST "', ");
            *msg = xmlStrcat(*msg, BAD_CAST "attribute '");         
        } else {
            *msg = xmlStrdup(BAD_CAST "Element '");
        }
        if (node->ns != NULL)
            *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
            node->ns->href, node->name));
        else
            *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
            NULL, node->name));
        FREE_AND_NULL(str);
        *msg = xmlStrcat(*msg, BAD_CAST "': ");
    } else if (actxt->type == XML_SCHEMA_CTXT_VALIDATOR) {
        xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) actxt;
        /*
        * Work on node infos.
        */      
        if (vctxt->inode->nodeType == XML_ATTRIBUTE_NODE) {
            xmlSchemaNodeInfoPtr ielem =
                vctxt->elemInfos[vctxt->depth];

            *msg = xmlStrdup(BAD_CAST "Element '");
            *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
                ielem->nsName, ielem->localName));
            FREE_AND_NULL(str);
            *msg = xmlStrcat(*msg, BAD_CAST "', ");
            *msg = xmlStrcat(*msg, BAD_CAST "attribute '");         
        } else {
            *msg = xmlStrdup(BAD_CAST "Element '");
        }
        *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
            vctxt->inode->nsName, vctxt->inode->localName));
        FREE_AND_NULL(str);
        *msg = xmlStrcat(*msg, BAD_CAST "': ");
    } else if (actxt->type == XML_SCHEMA_CTXT_PARSER) {
        /* 
        * Hmm, no node while parsing?
        * Return an empty string, in case NULL will break something.
        */
        *msg = xmlStrdup(BAD_CAST "");
    } else {
        TODO
        return (NULL);
    }
    /*
    * VAL TODO: The output of the given schema component is currently
    * disabled.
    */
#if 0
    if ((type != NULL) && (xmlSchemaIsGlobalItem(type))) {
        *msg = xmlStrcat(*msg, BAD_CAST " [");
        *msg = xmlStrcat(*msg, xmlSchemaFormatItemForReport(&str,
            NULL, type, NULL, 0));
        FREE_AND_NULL(str)
        *msg = xmlStrcat(*msg, BAD_CAST "]");
    }
#endif
    return (*msg);
}

static void
xmlSchemaInternalErr2(xmlSchemaAbstractCtxtPtr actxt,
                     const char *funcName,
                     const char *message,
                     const xmlChar *str1,
                     const xmlChar *str2)
{
    xmlChar *msg = NULL;

    if (actxt == NULL)
        return;
    msg = xmlStrdup(BAD_CAST "Internal error: ");
    msg = xmlStrcat(msg, BAD_CAST funcName);
    msg = xmlStrcat(msg, BAD_CAST ", ");    
    msg = xmlStrcat(msg, BAD_CAST message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");

    if (actxt->type == XML_SCHEMA_CTXT_VALIDATOR)
        xmlSchemaErr(actxt, XML_SCHEMAV_INTERNAL, NULL,
            (const char *) msg, str1, str2);

    else if (actxt->type == XML_SCHEMA_CTXT_PARSER)     
        xmlSchemaErr(actxt, XML_SCHEMAP_INTERNAL, NULL,
            (const char *) msg, str1, str2);

    FREE_AND_NULL(msg)
}

static void
xmlSchemaInternalErr(xmlSchemaAbstractCtxtPtr actxt,
                     const char *funcName,
                     const char *message)
{
    xmlSchemaInternalErr2(actxt, funcName, message, NULL, NULL);
}

#if 0
static void
xmlSchemaPInternalErr(xmlSchemaParserCtxtPtr pctxt,
                     const char *funcName,
                     const char *message,
                     const xmlChar *str1,
                     const xmlChar *str2)
{
    xmlSchemaInternalErr2(ACTXT_CAST pctxt, funcName, message,
        str1, str2);
}
#endif

static void
xmlSchemaCustomErr4(xmlSchemaAbstractCtxtPtr actxt,
                   xmlParserErrors error,
                   xmlNodePtr node,
                   xmlSchemaBasicItemPtr item,
                   const char *message,
                   const xmlChar *str1, const xmlChar *str2,
                   const xmlChar *str3, const xmlChar *str4)
{
    xmlChar *msg = NULL;

    if ((node == NULL) && (item != NULL) &&
        (actxt->type == XML_SCHEMA_CTXT_PARSER)) {
        node = WXS_ITEM_NODE(item);
        xmlSchemaFormatItemForReport(&msg, NULL, item, NULL);
        msg = xmlStrcat(msg, BAD_CAST ": ");
    } else
        xmlSchemaFormatNodeForError(&msg, actxt, node);
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");   
    xmlSchemaErr4(actxt, error, node,
        (const char *) msg, str1, str2, str3, str4);
    FREE_AND_NULL(msg)
}

static void
xmlSchemaCustomErr(xmlSchemaAbstractCtxtPtr actxt,
                   xmlParserErrors error,
                   xmlNodePtr node,
                   xmlSchemaBasicItemPtr item,
                   const char *message,
                   const xmlChar *str1,
                   const xmlChar *str2)
{
    xmlSchemaCustomErr4(actxt, error, node, item,
        message, str1, str2, NULL, NULL);    
}



static void
xmlSchemaCustomWarning(xmlSchemaAbstractCtxtPtr actxt,
                   xmlParserErrors error,
                   xmlNodePtr node,
                   xmlSchemaTypePtr type ATTRIBUTE_UNUSED,
                   const char *message,
                   const xmlChar *str1,
                   const xmlChar *str2,
                   const xmlChar *str3)
{
    xmlChar *msg = NULL;

    xmlSchemaFormatNodeForError(&msg, actxt, node);
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n"); 
    
    /* URGENT TODO: Set the error code to something sane. */
    xmlSchemaErr4Line(actxt, XML_ERR_WARNING, error, node, 0,
        (const char *) msg, str1, str2, str3, NULL);

    FREE_AND_NULL(msg)
}



static void
xmlSchemaKeyrefErr(xmlSchemaValidCtxtPtr vctxt,
                   xmlParserErrors error,
                   xmlSchemaPSVIIDCNodePtr idcNode,
                   xmlSchemaTypePtr type ATTRIBUTE_UNUSED,
                   const char *message,
                   const xmlChar *str1,
                   const xmlChar *str2)
{
    xmlChar *msg = NULL, *qname = NULL;
    
    msg = xmlStrdup(BAD_CAST "Element '%s': ");        
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    xmlSchemaErr4Line(ACTXT_CAST vctxt, XML_ERR_ERROR,
        error, NULL, idcNode->nodeLine, (const char *) msg,
        xmlSchemaFormatQName(&qname,
            vctxt->nodeQNames->items[idcNode->nodeQNameID +1],
            vctxt->nodeQNames->items[idcNode->nodeQNameID]), 
        str1, str2, NULL);
    FREE_AND_NULL(qname);
    FREE_AND_NULL(msg);
}

static int
xmlSchemaEvalErrorNodeType(xmlSchemaAbstractCtxtPtr actxt,
                           xmlNodePtr node)
{
    if (node != NULL)
        return (node->type);
    if ((actxt->type == XML_SCHEMA_CTXT_VALIDATOR) &&
        (((xmlSchemaValidCtxtPtr) actxt)->inode != NULL))
        return ( ((xmlSchemaValidCtxtPtr) actxt)->inode->nodeType);
    return (-1);
}

static int
xmlSchemaIsGlobalItem(xmlSchemaTypePtr item)
{
    switch (item->type) {
        case XML_SCHEMA_TYPE_COMPLEX:
        case XML_SCHEMA_TYPE_SIMPLE:
            if (item->flags & XML_SCHEMAS_TYPE_GLOBAL)
                return(1);
            break;
        case XML_SCHEMA_TYPE_GROUP:
            return (1);
        case XML_SCHEMA_TYPE_ELEMENT:
            if ( ((xmlSchemaElementPtr) item)->flags &
                XML_SCHEMAS_ELEM_GLOBAL)
                return(1);
            break;
        case XML_SCHEMA_TYPE_ATTRIBUTE:
            if ( ((xmlSchemaAttributePtr) item)->flags &
                XML_SCHEMAS_ATTR_GLOBAL)
                return(1);
            break;
        /* Note that attribute groups are always global. */
        default:
            return(1);
    }
    return (0);
}

static void
xmlSchemaSimpleTypeErr(xmlSchemaAbstractCtxtPtr actxt,
                       xmlParserErrors error,
                       xmlNodePtr node,
                       const xmlChar *value,
                       xmlSchemaTypePtr type,
                       int displayValue)
{
    xmlChar *msg = NULL;

    xmlSchemaFormatNodeForError(&msg, actxt, node);

    if (displayValue || (xmlSchemaEvalErrorNodeType(actxt, node) ==
            XML_ATTRIBUTE_NODE))
        msg = xmlStrcat(msg, BAD_CAST "'%s' is not a valid value of ");
    else
        msg = xmlStrcat(msg, BAD_CAST "The character content is not a valid "
            "value of ");

    if (! xmlSchemaIsGlobalItem(type))
        msg = xmlStrcat(msg, BAD_CAST "the local ");
    else
        msg = xmlStrcat(msg, BAD_CAST "the ");

    if (WXS_IS_ATOMIC(type))
        msg = xmlStrcat(msg, BAD_CAST "atomic type");
    else if (WXS_IS_LIST(type))
        msg = xmlStrcat(msg, BAD_CAST "list type");
    else if (WXS_IS_UNION(type))
        msg = xmlStrcat(msg, BAD_CAST "union type");

    if (xmlSchemaIsGlobalItem(type)) {
        xmlChar *str = NULL;
        msg = xmlStrcat(msg, BAD_CAST " '");
        if (type->builtInType != 0) {
            msg = xmlStrcat(msg, BAD_CAST "xs:");
            msg = xmlStrcat(msg, type->name);
        } else 
            msg = xmlStrcat(msg,
                xmlSchemaFormatQName(&str,
                    type->targetNamespace, type->name));
        msg = xmlStrcat(msg, BAD_CAST "'");
        FREE_AND_NULL(str);
    }
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    if (displayValue || (xmlSchemaEvalErrorNodeType(actxt, node) ==
            XML_ATTRIBUTE_NODE))
        xmlSchemaErr(actxt, error, node, (const char *) msg, value, NULL);
    else
        xmlSchemaErr(actxt, error, node, (const char *) msg, NULL, NULL);
    FREE_AND_NULL(msg)
}

static const xmlChar *
xmlSchemaFormatErrorNodeQName(xmlChar ** str,
                              xmlSchemaNodeInfoPtr ni,
                              xmlNodePtr node)
{
    if (node != NULL) {
        if (node->ns != NULL)
            return (xmlSchemaFormatQName(str, node->ns->href, node->name));
        else
            return (xmlSchemaFormatQName(str, NULL, node->name));
    } else if (ni != NULL)
        return (xmlSchemaFormatQName(str, ni->nsName, ni->localName));
    return (NULL);
}

static void
xmlSchemaIllegalAttrErr(xmlSchemaAbstractCtxtPtr actxt,
                        xmlParserErrors error,
                        xmlSchemaAttrInfoPtr ni,
                        xmlNodePtr node)
{
    xmlChar *msg = NULL, *str = NULL;
    
    xmlSchemaFormatNodeForError(&msg, actxt, node);
    msg = xmlStrcat(msg, BAD_CAST "The attribute '%s' is not allowed.\n");
    xmlSchemaErr(actxt, error, node, (const char *) msg,
        xmlSchemaFormatErrorNodeQName(&str, (xmlSchemaNodeInfoPtr) ni, node),
        NULL);        
    FREE_AND_NULL(str)
    FREE_AND_NULL(msg)
}

static void
xmlSchemaComplexTypeErr(xmlSchemaAbstractCtxtPtr actxt,
                        xmlParserErrors error,
                        xmlNodePtr node,
                        xmlSchemaTypePtr type ATTRIBUTE_UNUSED,
                        const char *message,
                        int nbval,
                        int nbneg,
                        xmlChar **values)
{
    xmlChar *str = NULL, *msg = NULL;
    xmlChar *localName, *nsName;
    const xmlChar *cur, *end;
    int i;
    
    xmlSchemaFormatNodeForError(&msg, actxt, node);
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".");
    /*
    * Note that is does not make sense to report that we have a
    * wildcard here, since the wildcard might be unfolded into
    * multiple transitions.
    */
    if (nbval + nbneg > 0) {
        if (nbval + nbneg > 1) {
            str = xmlStrdup(BAD_CAST " Expected is one of ( ");
        } else
            str = xmlStrdup(BAD_CAST " Expected is ( ");
        nsName = NULL;
            
        for (i = 0; i < nbval + nbneg; i++) {
            cur = values[i];
            if (cur == NULL)
                continue;
            if ((cur[0] == 'n') && (cur[1] == 'o') && (cur[2] == 't') &&
                (cur[3] == ' ')) {
                cur += 4;
                str = xmlStrcat(str, BAD_CAST "##other");
            }
            /*
            * Get the local name.
            */
            localName = NULL;
            
            end = cur;
            if (*end == '*') {
                localName = xmlStrdup(BAD_CAST "*");
                end++;
            } else {
                while ((*end != 0) && (*end != '|'))
                    end++;
                localName = xmlStrncat(localName, BAD_CAST cur, end - cur);
            }           
            if (*end != 0) {                
                end++;
                /*
                * Skip "*|*" if they come with negated expressions, since
                * they represent the same negated wildcard.
                */
                if ((nbneg == 0) || (*end != '*') || (*localName != '*')) {
                    /*
                    * Get the namespace name.
                    */
                    cur = end;
                    if (*end == '*') {
                        nsName = xmlStrdup(BAD_CAST "{*}");
                    } else {
                        while (*end != 0)
                            end++;
                        
                        if (i >= nbval)
                            nsName = xmlStrdup(BAD_CAST "{##other:");
                        else
                            nsName = xmlStrdup(BAD_CAST "{");
                        
                        nsName = xmlStrncat(nsName, BAD_CAST cur, end - cur);
                        nsName = xmlStrcat(nsName, BAD_CAST "}");
                    }
                    str = xmlStrcat(str, BAD_CAST nsName);
                    FREE_AND_NULL(nsName)
                } else {
                    FREE_AND_NULL(localName);
                    continue;
                }
            }           
            str = xmlStrcat(str, BAD_CAST localName);
            FREE_AND_NULL(localName);
                
            if (i < nbval + nbneg -1)
                str = xmlStrcat(str, BAD_CAST ", ");
        }       
        str = xmlStrcat(str, BAD_CAST " ).\n");
        msg = xmlStrcat(msg, BAD_CAST str);
        FREE_AND_NULL(str)
    } else
      msg = xmlStrcat(msg, BAD_CAST "\n");
    xmlSchemaErr(actxt, error, node, (const char *) msg, NULL, NULL);
    xmlFree(msg);
}

static void
xmlSchemaFacetErr(xmlSchemaAbstractCtxtPtr actxt,
                  xmlParserErrors error,
                  xmlNodePtr node,
                  const xmlChar *value,
                  unsigned long length,
                  xmlSchemaTypePtr type,
                  xmlSchemaFacetPtr facet,
                  const char *message,
                  const xmlChar *str1,
                  const xmlChar *str2)
{
    xmlChar *str = NULL, *msg = NULL;
    xmlSchemaTypeType facetType;
    int nodeType = xmlSchemaEvalErrorNodeType(actxt, node);

    xmlSchemaFormatNodeForError(&msg, actxt, node);
    if (error == XML_SCHEMAV_CVC_ENUMERATION_VALID) {
        facetType = XML_SCHEMA_FACET_ENUMERATION;
        /*
        * If enumerations are validated, one must not expect the
        * facet to be given.
        */      
    } else      
        facetType = facet->type;
    msg = xmlStrcat(msg, BAD_CAST "[");
    msg = xmlStrcat(msg, BAD_CAST "facet '");
    msg = xmlStrcat(msg, xmlSchemaFacetTypeToString(facetType));
    msg = xmlStrcat(msg, BAD_CAST "'] ");
    if (message == NULL) {
        /*
        * Use a default message.
        */
        if ((facetType == XML_SCHEMA_FACET_LENGTH) ||
            (facetType == XML_SCHEMA_FACET_MINLENGTH) ||
            (facetType == XML_SCHEMA_FACET_MAXLENGTH)) {

            char len[25], actLen[25];

            /* FIXME, TODO: What is the max expected string length of the
            * this value?
            */
            if (nodeType == XML_ATTRIBUTE_NODE)
                msg = xmlStrcat(msg, BAD_CAST "The value '%s' has a length of '%s'; ");
            else
                msg = xmlStrcat(msg, BAD_CAST "The value has a length of '%s'; ");

            snprintf(len, 24, "%lu", xmlSchemaGetFacetValueAsULong(facet));
            snprintf(actLen, 24, "%lu", length);

            if (facetType == XML_SCHEMA_FACET_LENGTH)
                msg = xmlStrcat(msg, 
                BAD_CAST "this differs from the allowed length of '%s'.\n");     
            else if (facetType == XML_SCHEMA_FACET_MAXLENGTH)
                msg = xmlStrcat(msg, 
                BAD_CAST "this exceeds the allowed maximum length of '%s'.\n");
            else if (facetType == XML_SCHEMA_FACET_MINLENGTH)
                msg = xmlStrcat(msg, 
                BAD_CAST "this underruns the allowed minimum length of '%s'.\n");
            
            if (nodeType == XML_ATTRIBUTE_NODE)
                xmlSchemaErr3(actxt, error, node, (const char *) msg,
                    value, (const xmlChar *) actLen, (const xmlChar *) len);
            else 
                xmlSchemaErr(actxt, error, node, (const char *) msg,
                    (const xmlChar *) actLen, (const xmlChar *) len);
        
        } else if (facetType == XML_SCHEMA_FACET_ENUMERATION) {
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' is not an element "
                "of the set {%s}.\n");
            xmlSchemaErr(actxt, error, node, (const char *) msg, value, 
                xmlSchemaFormatFacetEnumSet(actxt, &str, type));
        } else if (facetType == XML_SCHEMA_FACET_PATTERN) {
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' is not accepted "
                "by the pattern '%s'.\n");
            xmlSchemaErr(actxt, error, node, (const char *) msg, value, 
                facet->value);
        } else if (facetType == XML_SCHEMA_FACET_MININCLUSIVE) {
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' is less than the "
                "minimum value allowed ('%s').\n");
            xmlSchemaErr(actxt, error, node, (const char *) msg, value,
                facet->value);
        } else if (facetType == XML_SCHEMA_FACET_MAXINCLUSIVE) {
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' is greater than the "
                "maximum value allowed ('%s').\n");
            xmlSchemaErr(actxt, error, node, (const char *) msg, value,
                facet->value);
        } else if (facetType == XML_SCHEMA_FACET_MINEXCLUSIVE) {
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' must be greater than "
                "'%s'.\n");
            xmlSchemaErr(actxt, error, node, (const char *) msg, value,
                facet->value);
        } else if (facetType == XML_SCHEMA_FACET_MAXEXCLUSIVE) {
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' must be less than "
                "'%s'.\n");
            xmlSchemaErr(actxt, error, node, (const char *) msg, value,
                facet->value);
        } else if (facetType == XML_SCHEMA_FACET_TOTALDIGITS) {
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' has more "
                "digits than are allowed ('%s').\n");
            xmlSchemaErr(actxt, error, node, (const char*) msg, value,
                facet->value);
        } else if (facetType == XML_SCHEMA_FACET_FRACTIONDIGITS) {
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' has more fractional "
                "digits than are allowed ('%s').\n");
            xmlSchemaErr(actxt, error, node, (const char*) msg, value,
                facet->value);
        } else if (nodeType == XML_ATTRIBUTE_NODE) {            
            msg = xmlStrcat(msg, BAD_CAST "The value '%s' is not facet-valid.\n");
            xmlSchemaErr(actxt, error, node, (const char *) msg, value, NULL);  
        } else {            
            msg = xmlStrcat(msg, BAD_CAST "The value is not facet-valid.\n");
            xmlSchemaErr(actxt, error, node, (const char *) msg, NULL, NULL);
        }
    } else {
        msg = xmlStrcat(msg, (const xmlChar *) message);
        msg = xmlStrcat(msg, BAD_CAST ".\n");
        xmlSchemaErr(actxt, error, node, (const char *) msg, str1, str2);
    }        
    FREE_AND_NULL(str)
    xmlFree(msg);
}

#define VERROR(err, type, msg) \
    xmlSchemaCustomErr(ACTXT_CAST vctxt, err, NULL, type, msg, NULL, NULL);

#define VERROR_INT(func, msg) xmlSchemaInternalErr(ACTXT_CAST vctxt, func, msg);

#define PERROR_INT(func, msg) xmlSchemaInternalErr(ACTXT_CAST pctxt, func, msg);
#define PERROR_INT2(func, msg) xmlSchemaInternalErr(ACTXT_CAST ctxt, func, msg);

#define AERROR_INT(func, msg) xmlSchemaInternalErr(actxt, func, msg);


/**
 * xmlSchemaPMissingAttrErr:
 * @ctxt: the schema validation context
 * @ownerDes: the designation of  the owner
 * @ownerName: the name of the owner
 * @ownerItem: the owner as a schema object
 * @ownerElem: the owner as an element node
 * @node: the parent element node of the missing attribute node
 * @type: the corresponding type of the attribute node
 *
 * Reports an illegal attribute.
 */
static void
xmlSchemaPMissingAttrErr(xmlSchemaParserCtxtPtr ctxt,
                         xmlParserErrors error,
                         xmlSchemaBasicItemPtr ownerItem,
                         xmlNodePtr ownerElem,
                         const char *name,
                         const char *message)
{
    xmlChar *des = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, ownerItem, ownerElem);

    if (message != NULL)
        xmlSchemaPErr(ctxt, ownerElem, error, "%s: %s.\n", BAD_CAST des, BAD_CAST message);
    else
        xmlSchemaPErr(ctxt, ownerElem, error,
            "%s: The attribute '%s' is required but missing.\n",
            BAD_CAST des, BAD_CAST name);
    FREE_AND_NULL(des);
}


/**
 * xmlSchemaPResCompAttrErr:
 * @ctxt: the schema validation context
 * @error: the error code
 * @ownerDes: the designation of  the owner
 * @ownerItem: the owner as a schema object
 * @ownerElem: the owner as an element node
 * @name: the name of the attribute holding the QName
 * @refName: the referenced local name
 * @refURI: the referenced namespace URI
 * @message: optional message
 *
 * Used to report QName attribute values that failed to resolve
 * to schema components.
 */
static void
xmlSchemaPResCompAttrErr(xmlSchemaParserCtxtPtr ctxt,
                         xmlParserErrors error,
                         xmlSchemaBasicItemPtr ownerItem,
                         xmlNodePtr ownerElem,
                         const char *name,
                         const xmlChar *refName,
                         const xmlChar *refURI,
                         xmlSchemaTypeType refType,
                         const char *refTypeStr)
{
    xmlChar *des = NULL, *strA = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, ownerItem, ownerElem);
    if (refTypeStr == NULL)
        refTypeStr = (const char *) xmlSchemaItemTypeToStr(refType);
        xmlSchemaPErrExt(ctxt, ownerElem, error,
            NULL, NULL, NULL,
            "%s, attribute '%s': The QName value '%s' does not resolve to a(n) "
            "%s.\n", BAD_CAST des, BAD_CAST name,
            xmlSchemaFormatQName(&strA, refURI, refName),
            BAD_CAST refTypeStr, NULL);
    FREE_AND_NULL(des)
    FREE_AND_NULL(strA)
}

/**
 * xmlSchemaPCustomAttrErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @ownerDes: the designation of the owner
 * @ownerItem: the owner as a schema object
 * @attr: the illegal attribute node
 *
 * Reports an illegal attribute during the parse.
 */
static void
xmlSchemaPCustomAttrErr(xmlSchemaParserCtxtPtr ctxt,
                        xmlParserErrors error,
                        xmlChar **ownerDes,
                        xmlSchemaBasicItemPtr ownerItem,
                        xmlAttrPtr attr,
                        const char *msg)
{
    xmlChar *des = NULL;

    if (ownerDes == NULL)
        xmlSchemaFormatItemForReport(&des, NULL, ownerItem, attr->parent);
    else if (*ownerDes == NULL) {
        xmlSchemaFormatItemForReport(ownerDes, NULL, ownerItem, attr->parent);
        des = *ownerDes;
    } else
        des = *ownerDes;
    if (attr == NULL) {
        xmlSchemaPErrExt(ctxt, NULL, error, NULL, NULL, NULL,
            "%s, attribute '%s': %s.\n",
            BAD_CAST des, (const xmlChar *) "Unknown",
            (const xmlChar *) msg, NULL, NULL);
    } else {
        xmlSchemaPErrExt(ctxt, (xmlNodePtr) attr, error, NULL, NULL, NULL,
            "%s, attribute '%s': %s.\n",
            BAD_CAST des, attr->name, (const xmlChar *) msg, NULL, NULL);
    }
    if (ownerDes == NULL)
        FREE_AND_NULL(des);
}

/**
 * xmlSchemaPIllegalAttrErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @ownerDes: the designation of the attribute's owner
 * @ownerItem: the attribute's owner item
 * @attr: the illegal attribute node
 *
 * Reports an illegal attribute during the parse.
 */
static void
xmlSchemaPIllegalAttrErr(xmlSchemaParserCtxtPtr ctxt,
                         xmlParserErrors error,
                         xmlSchemaBasicItemPtr ownerComp ATTRIBUTE_UNUSED,
                         xmlAttrPtr attr)
{
    xmlChar *strA = NULL, *strB = NULL;

    xmlSchemaFormatNodeForError(&strA, ACTXT_CAST ctxt, attr->parent);
    xmlSchemaErr4(ACTXT_CAST ctxt, error, (xmlNodePtr) attr,
        "%sThe attribute '%s' is not allowed.\n", BAD_CAST strA,
        xmlSchemaFormatQNameNs(&strB, attr->ns, attr->name),
        NULL, NULL);
    FREE_AND_NULL(strA);
    FREE_AND_NULL(strB);
}

/**
 * xmlSchemaPCustomErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @itemDes: the designation of the schema item
 * @item: the schema item
 * @itemElem: the node of the schema item
 * @message: the error message
 * @str1: an optional param for the error message
 * @str2: an optional param for the error message
 * @str3: an optional param for the error message
 *
 * Reports an error during parsing.
 */
static void
xmlSchemaPCustomErrExt(xmlSchemaParserCtxtPtr ctxt,
                    xmlParserErrors error,
                    xmlSchemaBasicItemPtr item,
                    xmlNodePtr itemElem,
                    const char *message,
                    const xmlChar *str1,
                    const xmlChar *str2,
                    const xmlChar *str3)
{
    xmlChar *des = NULL, *msg = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, item, itemElem);
    msg = xmlStrdup(BAD_CAST "%s: ");
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    if ((itemElem == NULL) && (item != NULL))
        itemElem = WXS_ITEM_NODE(item);
    xmlSchemaPErrExt(ctxt, itemElem, error, NULL, NULL, NULL,
        (const char *) msg, BAD_CAST des, str1, str2, str3, NULL);
    FREE_AND_NULL(des);
    FREE_AND_NULL(msg);
}

/**
 * xmlSchemaPCustomErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @itemDes: the designation of the schema item
 * @item: the schema item
 * @itemElem: the node of the schema item
 * @message: the error message
 * @str1: the optional param for the error message
 *
 * Reports an error during parsing.
 */
static void
xmlSchemaPCustomErr(xmlSchemaParserCtxtPtr ctxt,
                    xmlParserErrors error,
                    xmlSchemaBasicItemPtr item,
                    xmlNodePtr itemElem,
                    const char *message,
                    const xmlChar *str1)
{
    xmlSchemaPCustomErrExt(ctxt, error, item, itemElem, message,
        str1, NULL, NULL);
}

/**
 * xmlSchemaPAttrUseErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @itemDes: the designation of the schema type
 * @item: the schema type
 * @itemElem: the node of the schema type
 * @attr: the invalid schema attribute
 * @message: the error message
 * @str1: the optional param for the error message
 *
 * Reports an attribute use error during parsing.
 */
static void
xmlSchemaPAttrUseErr4(xmlSchemaParserCtxtPtr ctxt,
                    xmlParserErrors error,
                    xmlNodePtr node,
                    xmlSchemaBasicItemPtr ownerItem,
                    const xmlSchemaAttributeUsePtr attruse,
                    const char *message,
                    const xmlChar *str1, const xmlChar *str2,
                    const xmlChar *str3,const xmlChar *str4)
{
    xmlChar *str = NULL, *msg = NULL;
    
    xmlSchemaFormatItemForReport(&msg, NULL, ownerItem, NULL);
    msg = xmlStrcat(msg, BAD_CAST ", ");    
    msg = xmlStrcat(msg,
        BAD_CAST xmlSchemaFormatItemForReport(&str, NULL,
        WXS_BASIC_CAST attruse, NULL));
    FREE_AND_NULL(str);
    msg = xmlStrcat(msg, BAD_CAST ": ");
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    xmlSchemaErr4(ACTXT_CAST ctxt, error, node, 
        (const char *) msg, str1, str2, str3, str4);
    xmlFree(msg);
}

/**
 * xmlSchemaPIllegalFacetAtomicErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @type: the schema type
 * @baseType: the base type of type
 * @facet: the illegal facet
 *
 * Reports an illegal facet for atomic simple types.
 */
static void
xmlSchemaPIllegalFacetAtomicErr(xmlSchemaParserCtxtPtr ctxt,
                          xmlParserErrors error,
                          xmlSchemaTypePtr type,
                          xmlSchemaTypePtr baseType,
                          xmlSchemaFacetPtr facet)
{
    xmlChar *des = NULL, *strT = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, WXS_BASIC_CAST type, type->node);
    xmlSchemaPErrExt(ctxt, type->node, error, NULL, NULL, NULL,
        "%s: The facet '%s' is not allowed on types derived from the "
        "type %s.\n",
        BAD_CAST des, xmlSchemaFacetTypeToString(facet->type),
        xmlSchemaFormatItemForReport(&strT, NULL, WXS_BASIC_CAST baseType, NULL),
        NULL, NULL);
    FREE_AND_NULL(des);
    FREE_AND_NULL(strT);
}

/**
 * xmlSchemaPIllegalFacetListUnionErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @itemDes: the designation of the schema item involved
 * @item: the schema item involved
 * @facet: the illegal facet
 *
 * Reports an illegal facet for <list> and <union>.
 */
static void
xmlSchemaPIllegalFacetListUnionErr(xmlSchemaParserCtxtPtr ctxt,
                          xmlParserErrors error,
                          xmlSchemaTypePtr type,
                          xmlSchemaFacetPtr facet)
{
    xmlChar *des = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, WXS_BASIC_CAST type,
        type->node);
    xmlSchemaPErr(ctxt, type->node, error,
        "%s: The facet '%s' is not allowed.\n",
        BAD_CAST des, xmlSchemaFacetTypeToString(facet->type));
    FREE_AND_NULL(des);
}

/**
 * xmlSchemaPMutualExclAttrErr:
 * @ctxt: the schema validation context
 * @error: the error code
 * @elemDes: the designation of the parent element node
 * @attr: the bad attribute node
 * @type: the corresponding type of the attribute node
 *
 * Reports an illegal attribute.
 */
static void
xmlSchemaPMutualExclAttrErr(xmlSchemaParserCtxtPtr ctxt,
                         xmlParserErrors error,
                         xmlSchemaBasicItemPtr ownerItem,
                         xmlAttrPtr attr,
                         const char *name1,
                         const char *name2)
{
    xmlChar *des = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, WXS_BASIC_CAST ownerItem, attr->parent);
    xmlSchemaPErrExt(ctxt, (xmlNodePtr) attr, error, NULL, NULL, NULL,
        "%s: The attributes '%s' and '%s' are mutually exclusive.\n",
        BAD_CAST des, BAD_CAST name1, BAD_CAST name2, NULL, NULL);
    FREE_AND_NULL(des);
}

/**
 * xmlSchemaPSimpleTypeErr:
 * @ctxt:  the schema validation context
 * @error: the error code
 * @type: the type specifier
 * @ownerDes: the designation of the owner
 * @ownerItem: the schema object if existent 
 * @node: the validated node
 * @value: the validated value
 *
 * Reports a simple type validation error.
 * TODO: Should this report the value of an element as well?
 */
static void
xmlSchemaPSimpleTypeErr(xmlSchemaParserCtxtPtr ctxt, 
                        xmlParserErrors error,
                        xmlSchemaBasicItemPtr ownerItem ATTRIBUTE_UNUSED,
                        xmlNodePtr node,
                        xmlSchemaTypePtr type,
                        const char *expected,
                        const xmlChar *value,
                        const char *message,
                        const xmlChar *str1,
                        const xmlChar *str2)
{
    xmlChar *msg = NULL;
    
    xmlSchemaFormatNodeForError(&msg, ACTXT_CAST ctxt, node);
    if (message == NULL) {
        /*
        * Use default messages.
        */      
        if (type != NULL) {
            if (node->type == XML_ATTRIBUTE_NODE)
                msg = xmlStrcat(msg, BAD_CAST "'%s' is not a valid value of ");
            else
                msg = xmlStrcat(msg, BAD_CAST "The character content is not a "
                "valid value of ");     
            if (! xmlSchemaIsGlobalItem(type))
                msg = xmlStrcat(msg, BAD_CAST "the local ");
            else
                msg = xmlStrcat(msg, BAD_CAST "the ");
            
            if (WXS_IS_ATOMIC(type))
                msg = xmlStrcat(msg, BAD_CAST "atomic type");
            else if (WXS_IS_LIST(type))
                msg = xmlStrcat(msg, BAD_CAST "list type");
            else if (WXS_IS_UNION(type))
                msg = xmlStrcat(msg, BAD_CAST "union type");
            
            if (xmlSchemaIsGlobalItem(type)) {
                xmlChar *str = NULL;
                msg = xmlStrcat(msg, BAD_CAST " '");
                if (type->builtInType != 0) {
                    msg = xmlStrcat(msg, BAD_CAST "xs:");
                    msg = xmlStrcat(msg, type->name);
                } else 
                    msg = xmlStrcat(msg,
                        xmlSchemaFormatQName(&str,
                            type->targetNamespace, type->name));
                msg = xmlStrcat(msg, BAD_CAST "'.");
                FREE_AND_NULL(str);
            }
        } else {
            if (node->type == XML_ATTRIBUTE_NODE)
                msg = xmlStrcat(msg, BAD_CAST "The value '%s' is not valid.");
            else
                msg = xmlStrcat(msg, BAD_CAST "The character content is not "
                "valid.");
        }       
        if (expected) {
            msg = xmlStrcat(msg, BAD_CAST " Expected is '");
            msg = xmlStrcat(msg, BAD_CAST expected);
            msg = xmlStrcat(msg, BAD_CAST "'.\n");
        } else
            msg = xmlStrcat(msg, BAD_CAST "\n");
        if (node->type == XML_ATTRIBUTE_NODE)
            xmlSchemaPErr(ctxt, node, error, (const char *) msg, value, NULL);
        else
            xmlSchemaPErr(ctxt, node, error, (const char *) msg, NULL, NULL);
    } else {
        msg = xmlStrcat(msg, BAD_CAST message);
        msg = xmlStrcat(msg, BAD_CAST ".\n");
        xmlSchemaPErrExt(ctxt, node, error, NULL, NULL, NULL,
             (const char*) msg, str1, str2, NULL, NULL, NULL);
    }
    /* Cleanup. */    
    FREE_AND_NULL(msg)
}

/**
 * xmlSchemaPContentErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @onwerDes: the designation of the holder of the content
 * @ownerItem: the owner item of the holder of the content
 * @ownerElem: the node of the holder of the content
 * @child: the invalid child node
 * @message: the optional error message
 * @content: the optional string describing the correct content
 *
 * Reports an error concerning the content of a schema element.
 */
static void
xmlSchemaPContentErr(xmlSchemaParserCtxtPtr ctxt,
                     xmlParserErrors error,
                     xmlSchemaBasicItemPtr ownerItem,
                     xmlNodePtr ownerElem,
                     xmlNodePtr child,
                     const char *message,
                     const char *content)
{
    xmlChar *des = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, ownerItem, ownerElem);
    if (message != NULL)
        xmlSchemaPErr2(ctxt, ownerElem, child, error,
            "%s: %s.\n",
            BAD_CAST des, BAD_CAST message);
    else {
        if (content != NULL) {
            xmlSchemaPErr2(ctxt, ownerElem, child, error,
                "%s: The content is not valid. Expected is %s.\n",
                BAD_CAST des, BAD_CAST content);
        } else {
            xmlSchemaPErr2(ctxt, ownerElem, child, error,
                "%s: The content is not valid.\n",
                BAD_CAST des, NULL);
        }
    }
    FREE_AND_NULL(des)
}

/************************************************************************
 *                                                                      *
 *                      Streamable error functions                      *
 *                                                                      *
 ************************************************************************/




/************************************************************************
 *                                                                      *
 *                      Validation helper functions                     *
 *                                                                      *
 ************************************************************************/


/************************************************************************
 *                                                                      *
 *                      Allocation functions                            *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSchemaNewSchemaForParserCtxt:
 * @ctxt:  a schema validation context
 *
 * Allocate a new Schema structure.
 *
 * Returns the newly allocated structure or NULL in case or error
 */
static xmlSchemaPtr
xmlSchemaNewSchema(xmlSchemaParserCtxtPtr ctxt)
{
    xmlSchemaPtr ret;

    ret = (xmlSchemaPtr) xmlMalloc(sizeof(xmlSchema));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating schema", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchema));
    ret->dict = ctxt->dict;
    xmlDictReference(ret->dict);

    return (ret);
}

/**
 * xmlSchemaNewFacet:
 *
 * Allocate a new Facet structure.
 *
 * Returns the newly allocated structure or NULL in case or error
 */
xmlSchemaFacetPtr
xmlSchemaNewFacet(void)
{
    xmlSchemaFacetPtr ret;

    ret = (xmlSchemaFacetPtr) xmlMalloc(sizeof(xmlSchemaFacet));
    if (ret == NULL) {
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaFacet));

    return (ret);
}

/**
 * xmlSchemaNewAnnot:
 * @ctxt:  a schema validation context
 * @node:  a node
 *
 * Allocate a new annotation structure.
 *
 * Returns the newly allocated structure or NULL in case or error
 */
static xmlSchemaAnnotPtr
xmlSchemaNewAnnot(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node)
{
    xmlSchemaAnnotPtr ret;

    ret = (xmlSchemaAnnotPtr) xmlMalloc(sizeof(xmlSchemaAnnot));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating annotation", node);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAnnot));
    ret->content = node;
    return (ret);
}

static xmlSchemaItemListPtr
xmlSchemaItemListCreate(void)
{
    xmlSchemaItemListPtr ret;

    ret = xmlMalloc(sizeof(xmlSchemaItemList));
    if (ret == NULL) {
        xmlSchemaPErrMemory(NULL,
            "allocating an item list structure", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaItemList));
    return (ret);
}

static void
xmlSchemaItemListClear(xmlSchemaItemListPtr list)
{
    if (list->items != NULL) {
        xmlFree(list->items);
        list->items = NULL;
    }
    list->nbItems = 0;
    list->sizeItems = 0;
}

static int
xmlSchemaItemListAdd(xmlSchemaItemListPtr list, void *item)
{
    if (list->items == NULL) {
        list->items = (void **) xmlMalloc(
            20 * sizeof(void *));
        if (list->items == NULL) {
            xmlSchemaPErrMemory(NULL, "allocating new item list", NULL);
            return(-1);
        }
        list->sizeItems = 20;
    } else if (list->sizeItems <= list->nbItems) {
        list->sizeItems *= 2;
        list->items = (void **) xmlRealloc(list->items,
            list->sizeItems * sizeof(void *));
        if (list->items == NULL) {
            xmlSchemaPErrMemory(NULL, "growing item list", NULL);
            list->sizeItems = 0;
            return(-1);
        }
    }
    list->items[list->nbItems++] = item;
    return(0);
}

static int
xmlSchemaItemListAddSize(xmlSchemaItemListPtr list,
                         int initialSize,
                         void *item)
{
    if (list->items == NULL) {
        if (initialSize <= 0)
            initialSize = 1;
        list->items = (void **) xmlMalloc(
            initialSize * sizeof(void *));
        if (list->items == NULL) {
            xmlSchemaPErrMemory(NULL, "allocating new item list", NULL);
            return(-1);
        }
        list->sizeItems = initialSize;
    } else if (list->sizeItems <= list->nbItems) {
        list->sizeItems *= 2;
        list->items = (void **) xmlRealloc(list->items,
            list->sizeItems * sizeof(void *));
        if (list->items == NULL) {
            xmlSchemaPErrMemory(NULL, "growing item list", NULL);
            list->sizeItems = 0;
            return(-1);
        }
    }
    list->items[list->nbItems++] = item;
    return(0);
}

static int
xmlSchemaItemListInsert(xmlSchemaItemListPtr list, void *item, int idx)
{    
    if (list->items == NULL) {
        list->items = (void **) xmlMalloc(
            20 * sizeof(void *));
        if (list->items == NULL) {
            xmlSchemaPErrMemory(NULL, "allocating new item list", NULL);
            return(-1);
        }
        list->sizeItems = 20;
    } else if (list->sizeItems <= list->nbItems) {
        list->sizeItems *= 2;
        list->items = (void **) xmlRealloc(list->items,
            list->sizeItems * sizeof(void *));
        if (list->items == NULL) {
            xmlSchemaPErrMemory(NULL, "growing item list", NULL);
            list->sizeItems = 0;
            return(-1);
        }
    }
    /*
    * Just append if the index is greater/equal than the item count.
    */
    if (idx >= list->nbItems) {
        list->items[list->nbItems++] = item;
    } else {
        int i;
        for (i = list->nbItems; i > idx; i--)
            list->items[i] = list->items[i-1];
        list->items[idx] = item;
        list->nbItems++;
    }
    return(0);
}

#if 0 /* enable if ever needed */
static int
xmlSchemaItemListInsertSize(xmlSchemaItemListPtr list,
                            int initialSize,
                            void *item,
                            int idx)
{    
    if (list->items == NULL) {
        if (initialSize <= 0)
            initialSize = 1;
        list->items = (void **) xmlMalloc(
            initialSize * sizeof(void *));
        if (list->items == NULL) {
            xmlSchemaPErrMemory(NULL, "allocating new item list", NULL);
            return(-1);
        }
        list->sizeItems = initialSize;
    } else if (list->sizeItems <= list->nbItems) {
        list->sizeItems *= 2;
        list->items = (void **) xmlRealloc(list->items,
            list->sizeItems * sizeof(void *));
        if (list->items == NULL) {
            xmlSchemaPErrMemory(NULL, "growing item list", NULL);
            list->sizeItems = 0;
            return(-1);
        }
    }
    /*
    * Just append if the index is greater/equal than the item count.
    */
    if (idx >= list->nbItems) {
        list->items[list->nbItems++] = item;
    } else {
        int i;
        for (i = list->nbItems; i > idx; i--)
            list->items[i] = list->items[i-1];
        list->items[idx] = item;
        list->nbItems++;
    }
    return(0);
}
#endif

static int
xmlSchemaItemListRemove(xmlSchemaItemListPtr list, int idx)
{
    int i;
    if ((list->items == NULL) || (idx >= list->nbItems)) {
        xmlSchemaPSimpleErr("Internal error: xmlSchemaItemListRemove, "
            "index error.\n");
        return(-1);
    }

    if (list->nbItems == 1) {
        /* TODO: Really free the list? */
        xmlFree(list->items);
        list->items = NULL;
        list->nbItems = 0;
        list->sizeItems = 0;
    } else if (list->nbItems -1 == idx) {
        list->nbItems--;
    } else {    
        for (i = idx; i < list->nbItems -1; i++)
            list->items[i] = list->items[i+1];
        list->nbItems--;
    }
    return(0);
}

/**
 * xmlSchemaItemListFree:
 * @annot:  a schema type structure
 *
 * Deallocate a annotation structure
 */
static void
xmlSchemaItemListFree(xmlSchemaItemListPtr list)
{
    if (list == NULL)
        return;
    if (list->items != NULL)
        xmlFree(list->items);
    xmlFree(list);
}

static void
xmlSchemaBucketFree(xmlSchemaBucketPtr bucket)
{
    if (bucket == NULL)
        return;
    if (bucket->globals != NULL) {
        xmlSchemaComponentListFree(bucket->globals);
        xmlSchemaItemListFree(bucket->globals);
    }
    if (bucket->locals != NULL) {
        xmlSchemaComponentListFree(bucket->locals);
        xmlSchemaItemListFree(bucket->locals);  
    }
    if (bucket->relations != NULL) {
        xmlSchemaSchemaRelationPtr prev, cur = bucket->relations;
        do {
            prev = cur;     
            cur = cur->next;
            xmlFree(prev);
        } while (cur != NULL);
    }
    if ((! bucket->preserveDoc) && (bucket->doc != NULL)) {
        xmlFreeDoc(bucket->doc);
    } 
    if (bucket->type == XML_SCHEMA_SCHEMA_IMPORT) {
        if (WXS_IMPBUCKET(bucket)->schema != NULL)
            xmlSchemaFree(WXS_IMPBUCKET(bucket)->schema);
    }
    xmlFree(bucket);
}

static xmlSchemaBucketPtr
xmlSchemaBucketCreate(xmlSchemaParserCtxtPtr pctxt,
                         int type, const xmlChar *targetNamespace)
{
    xmlSchemaBucketPtr ret;
    int size;
    xmlSchemaPtr mainSchema;

    if (WXS_CONSTRUCTOR(pctxt)->mainSchema == NULL) {
        PERROR_INT("xmlSchemaBucketCreate",
            "no main schema on constructor");
        return(NULL);
    }
    mainSchema = WXS_CONSTRUCTOR(pctxt)->mainSchema;
    /* Create the schema bucket. */
    if (WXS_IS_BUCKET_INCREDEF(type))
        size = sizeof(xmlSchemaInclude);
    else
        size = sizeof(xmlSchemaImport);
    ret = (xmlSchemaBucketPtr) xmlMalloc(size);
    if (ret == NULL) {
        xmlSchemaPErrMemory(NULL, "allocating schema bucket", NULL);
        return(NULL);
    }
    memset(ret, 0, size);
    ret->targetNamespace = targetNamespace;
    ret->type = type;
    ret->globals = xmlSchemaItemListCreate();
    if (ret->globals == NULL) {
        xmlFree(ret);
        return(NULL);
    }
    ret->locals = xmlSchemaItemListCreate();
    if (ret->locals == NULL) {
        xmlFree(ret);
        return(NULL);
    }
    /* 
    * The following will assure that only the first bucket is marked as
    * XML_SCHEMA_SCHEMA_MAIN and it points to the *main* schema.
    * For each following import buckets an xmlSchema will be created.
    * An xmlSchema will be created for every distinct targetNamespace.
    * We assign the targetNamespace to the schemata here.
    */
    if (! WXS_HAS_BUCKETS(pctxt)) {
        if (WXS_IS_BUCKET_INCREDEF(type)) {
            PERROR_INT("xmlSchemaBucketCreate",
                "first bucket but it's an include or redefine");
            xmlSchemaBucketFree(ret);
            return(NULL);
        }
        /* Force the type to be XML_SCHEMA_SCHEMA_MAIN. */ 
        ret->type = XML_SCHEMA_SCHEMA_MAIN;
        /* Point to the *main* schema. */
        WXS_CONSTRUCTOR(pctxt)->mainBucket = ret;
        WXS_IMPBUCKET(ret)->schema = mainSchema;
        /*
        * Ensure that the main schema gets a targetNamespace.
        */
        mainSchema->targetNamespace = targetNamespace;
    } else {
        if (type == XML_SCHEMA_SCHEMA_MAIN) {       
            PERROR_INT("xmlSchemaBucketCreate",
                "main bucket but it's not the first one");
            xmlSchemaBucketFree(ret);
            return(NULL);
        } else if (type == XML_SCHEMA_SCHEMA_IMPORT) {      
            /*
            * Create a schema for imports and assign the
            * targetNamespace.
            */
            WXS_IMPBUCKET(ret)->schema = xmlSchemaNewSchema(pctxt);
            if (WXS_IMPBUCKET(ret)->schema == NULL) {
                xmlSchemaBucketFree(ret);
                return(NULL);
            }
            WXS_IMPBUCKET(ret)->schema->targetNamespace = targetNamespace;
        }
    }    
    if (WXS_IS_BUCKET_IMPMAIN(type)) {
        int res;
        /*
        * Imports go into the "schemasImports" slot of the main *schema*.
        * Note that we create an import entry for the main schema as well; i.e.,
        * even if there's only one schema, we'll get an import.
        */
        if (mainSchema->schemasImports == NULL) {
            mainSchema->schemasImports = xmlHashCreateDict(5,
                WXS_CONSTRUCTOR(pctxt)->dict);
            if (mainSchema->schemasImports == NULL) {
                xmlSchemaBucketFree(ret);
                return(NULL);
            }
        }
        if (targetNamespace == NULL)
            res = xmlHashAddEntry(mainSchema->schemasImports,
                XML_SCHEMAS_NO_NAMESPACE, ret);
        else
            res = xmlHashAddEntry(mainSchema->schemasImports,
                targetNamespace, ret);
        if (res != 0) {
            PERROR_INT("xmlSchemaBucketCreate",
                "failed to add the schema bucket to the hash");
            xmlSchemaBucketFree(ret);
            return(NULL);
        }
    } else {
        /* Set the @ownerImport of an include bucket. */
        if (WXS_IS_BUCKET_IMPMAIN(WXS_CONSTRUCTOR(pctxt)->bucket->type))
            WXS_INCBUCKET(ret)->ownerImport =
                WXS_IMPBUCKET(WXS_CONSTRUCTOR(pctxt)->bucket);
        else
            WXS_INCBUCKET(ret)->ownerImport =
                WXS_INCBUCKET(WXS_CONSTRUCTOR(pctxt)->bucket)->ownerImport;

        /* Includes got into the "includes" slot of the *main* schema. */
        if (mainSchema->includes == NULL) {
            mainSchema->includes = xmlSchemaItemListCreate();
            if (mainSchema->includes == NULL) {
                xmlSchemaBucketFree(ret);
                return(NULL);
            }       
        }
        xmlSchemaItemListAdd(mainSchema->includes, ret);
    }
    /* 
    * Add to list of all buckets; this is used for lookup
    * during schema construction time only.
    */
    if (xmlSchemaItemListAdd(WXS_CONSTRUCTOR(pctxt)->buckets, ret) == -1)
        return(NULL);
    return(ret);
}

static int
xmlSchemaAddItemSize(xmlSchemaItemListPtr *list, int initialSize, void *item)
{
    if (*list == NULL) {
        *list = xmlSchemaItemListCreate();
        if (*list == NULL)
            return(-1);
    }
    xmlSchemaItemListAddSize(*list, initialSize, item);
    return(0);
}

/**
 * xmlSchemaFreeAnnot:
 * @annot:  a schema type structure
 *
 * Deallocate a annotation structure
 */
static void
xmlSchemaFreeAnnot(xmlSchemaAnnotPtr annot)
{
    if (annot == NULL)
        return;
    if (annot->next == NULL) {
        xmlFree(annot);
    } else {
        xmlSchemaAnnotPtr prev;

        do {
            prev = annot;
            annot = annot->next;
            xmlFree(prev);
        } while (annot != NULL);
    }
}

/**
 * xmlSchemaFreeNotation:
 * @schema:  a schema notation structure
 *
 * Deallocate a Schema Notation structure.
 */
static void
xmlSchemaFreeNotation(xmlSchemaNotationPtr nota)
{
    if (nota == NULL)
        return;
    xmlFree(nota);
}

/**
 * xmlSchemaFreeAttribute:
 * @attr:  an attribute declaration
 *
 * Deallocates an attribute declaration structure.
 */
static void
xmlSchemaFreeAttribute(xmlSchemaAttributePtr attr)
{
    if (attr == NULL)
        return;
    if (attr->annot != NULL)
        xmlSchemaFreeAnnot(attr->annot);
    if (attr->defVal != NULL)
        xmlSchemaFreeValue(attr->defVal);
    xmlFree(attr);
}

/**
 * xmlSchemaFreeAttributeUse:
 * @use:  an attribute use
 *
 * Deallocates an attribute use structure.
 */
static void
xmlSchemaFreeAttributeUse(xmlSchemaAttributeUsePtr use)
{
    if (use == NULL)
        return;
    if (use->annot != NULL)
        xmlSchemaFreeAnnot(use->annot);
    if (use->defVal != NULL)
        xmlSchemaFreeValue(use->defVal);
    xmlFree(use);
}

/**
 * xmlSchemaFreeAttributeUseProhib:
 * @prohib:  an attribute use prohibition
 *
 * Deallocates an attribute use structure.
 */
static void
xmlSchemaFreeAttributeUseProhib(xmlSchemaAttributeUseProhibPtr prohib)
{
    if (prohib == NULL)
        return;
    xmlFree(prohib);
}

/**
 * xmlSchemaFreeWildcardNsSet:
 * set:  a schema wildcard namespace
 *
 * Deallocates a list of wildcard constraint structures.
 */
static void
xmlSchemaFreeWildcardNsSet(xmlSchemaWildcardNsPtr set)
{
    xmlSchemaWildcardNsPtr next;

    while (set != NULL) {
        next = set->next;
        xmlFree(set);
        set = next;
    }
}

/**
 * xmlSchemaFreeWildcard:
 * @wildcard:  a wildcard structure
 *
 * Deallocates a wildcard structure.
 */
void
xmlSchemaFreeWildcard(xmlSchemaWildcardPtr wildcard)
{
    if (wildcard == NULL)
        return;
    if (wildcard->annot != NULL)
        xmlSchemaFreeAnnot(wildcard->annot);
    if (wildcard->nsSet != NULL)
        xmlSchemaFreeWildcardNsSet(wildcard->nsSet);
    if (wildcard->negNsSet != NULL)
        xmlFree(wildcard->negNsSet);
    xmlFree(wildcard);
}

/**
 * xmlSchemaFreeAttributeGroup:
 * @schema:  a schema attribute group structure
 *
 * Deallocate a Schema Attribute Group structure.
 */
static void
xmlSchemaFreeAttributeGroup(xmlSchemaAttributeGroupPtr attrGr)
{
    if (attrGr == NULL)
        return;
    if (attrGr->annot != NULL)
        xmlSchemaFreeAnnot(attrGr->annot);
    if (attrGr->attrUses != NULL)
        xmlSchemaItemListFree(WXS_LIST_CAST attrGr->attrUses);
    xmlFree(attrGr);
}

/**
 * xmlSchemaFreeQNameRef:
 * @item: a QName reference structure
 *
 * Deallocatea a QName reference structure.
 */
static void
xmlSchemaFreeQNameRef(xmlSchemaQNameRefPtr item)
{
    xmlFree(item);
}

/**
 * xmlSchemaFreeTypeLinkList:
 * @alink: a type link
 *
 * Deallocate a list of types.
 */
static void
xmlSchemaFreeTypeLinkList(xmlSchemaTypeLinkPtr link)
{
    xmlSchemaTypeLinkPtr next;

    while (link != NULL) {
        next = link->next;
        xmlFree(link);
        link = next;
    }
}

static void
xmlSchemaFreeIDCStateObjList(xmlSchemaIDCStateObjPtr sto)
{
    xmlSchemaIDCStateObjPtr next;
    while (sto != NULL) {
        next = sto->next;
        if (sto->history != NULL)
            xmlFree(sto->history);
        if (sto->xpathCtxt != NULL)
            xmlFreeStreamCtxt((xmlStreamCtxtPtr) sto->xpathCtxt);
        xmlFree(sto);
        sto = next;
    }
}

/**
 * xmlSchemaFreeIDC:
 * @idc: a identity-constraint definition
 *
 * Deallocates an identity-constraint definition.
 */
static void
xmlSchemaFreeIDC(xmlSchemaIDCPtr idcDef)
{
    xmlSchemaIDCSelectPtr cur, prev;

    if (idcDef == NULL)
        return;
    if (idcDef->annot != NULL)
        xmlSchemaFreeAnnot(idcDef->annot);
    /* Selector */
    if (idcDef->selector != NULL) {
        if (idcDef->selector->xpathComp != NULL)
            xmlFreePattern((xmlPatternPtr) idcDef->selector->xpathComp);
        xmlFree(idcDef->selector);
    }
    /* Fields */
    if (idcDef->fields != NULL) {
        cur = idcDef->fields;
        do {
            prev = cur;
            cur = cur->next;
            if (prev->xpathComp != NULL)
                xmlFreePattern((xmlPatternPtr) prev->xpathComp);
            xmlFree(prev);
        } while (cur != NULL);
    }
    xmlFree(idcDef);
}

/**
 * xmlSchemaFreeElement:
 * @schema:  a schema element structure
 *
 * Deallocate a Schema Element structure.
 */
static void
xmlSchemaFreeElement(xmlSchemaElementPtr elem)
{
    if (elem == NULL)
        return;
    if (elem->annot != NULL)
        xmlSchemaFreeAnnot(elem->annot);
    if (elem->contModel != NULL)
        xmlRegFreeRegexp(elem->contModel);
    if (elem->defVal != NULL)
        xmlSchemaFreeValue(elem->defVal);
    xmlFree(elem);
}

/**
 * xmlSchemaFreeFacet:
 * @facet:  a schema facet structure
 *
 * Deallocate a Schema Facet structure.
 */
void
xmlSchemaFreeFacet(xmlSchemaFacetPtr facet)
{
    if (facet == NULL)
        return;
    if (facet->val != NULL)
        xmlSchemaFreeValue(facet->val);
    if (facet->regexp != NULL)
        xmlRegFreeRegexp(facet->regexp);
    if (facet->annot != NULL)
        xmlSchemaFreeAnnot(facet->annot);
    xmlFree(facet);
}

/**
 * xmlSchemaFreeType:
 * @type:  a schema type structure
 *
 * Deallocate a Schema Type structure.
 */
void
xmlSchemaFreeType(xmlSchemaTypePtr type)
{
    if (type == NULL)
        return;
    if (type->annot != NULL)
        xmlSchemaFreeAnnot(type->annot);
    if (type->facets != NULL) {
        xmlSchemaFacetPtr facet, next;

        facet = type->facets;
        while (facet != NULL) {
            next = facet->next;
            xmlSchemaFreeFacet(facet);
            facet = next;
        }
    }
    if (type->attrUses != NULL)
        xmlSchemaItemListFree((xmlSchemaItemListPtr) type->attrUses);
    if (type->memberTypes != NULL)
        xmlSchemaFreeTypeLinkList(type->memberTypes);
    if (type->facetSet != NULL) {
        xmlSchemaFacetLinkPtr next, link;

        link = type->facetSet;
        do {
            next = link->next;
            xmlFree(link);
            link = next;
        } while (link != NULL);
    }
    if (type->contModel != NULL)
        xmlRegFreeRegexp(type->contModel);
    xmlFree(type);
}

/**
 * xmlSchemaFreeModelGroupDef:
 * @item:  a schema model group definition
 *
 * Deallocates a schema model group definition.
 */
static void
xmlSchemaFreeModelGroupDef(xmlSchemaModelGroupDefPtr item)
{
    if (item->annot != NULL)
        xmlSchemaFreeAnnot(item->annot);
    xmlFree(item);
}

/**
 * xmlSchemaFreeModelGroup:
 * @item:  a schema model group
 *
 * Deallocates a schema model group structure.
 */
static void
xmlSchemaFreeModelGroup(xmlSchemaModelGroupPtr item)
{
    if (item->annot != NULL)
        xmlSchemaFreeAnnot(item->annot);
    xmlFree(item);
}

static void
xmlSchemaComponentListFree(xmlSchemaItemListPtr list)
{
    if ((list == NULL) || (list->nbItems == 0))
        return;
    {
        xmlSchemaTreeItemPtr item;
        xmlSchemaTreeItemPtr *items = (xmlSchemaTreeItemPtr *) list->items;
        int i;

        for (i = 0; i < list->nbItems; i++) {
            item = items[i];
            if (item == NULL)
                continue;           
            switch (item->type) {
                case XML_SCHEMA_TYPE_SIMPLE:
                case XML_SCHEMA_TYPE_COMPLEX:
                    xmlSchemaFreeType((xmlSchemaTypePtr) item);
                    break;
                case XML_SCHEMA_TYPE_ATTRIBUTE:
                    xmlSchemaFreeAttribute((xmlSchemaAttributePtr) item);
                    break;
                case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
                    xmlSchemaFreeAttributeUse((xmlSchemaAttributeUsePtr) item);
                    break;
                case XML_SCHEMA_EXTRA_ATTR_USE_PROHIB:
                    xmlSchemaFreeAttributeUseProhib(
                        (xmlSchemaAttributeUseProhibPtr) item);
                    break;
                case XML_SCHEMA_TYPE_ELEMENT:
                    xmlSchemaFreeElement((xmlSchemaElementPtr) item);
                    break;
                case XML_SCHEMA_TYPE_PARTICLE:
                    if (item->annot != NULL)
                        xmlSchemaFreeAnnot(item->annot);
                    xmlFree(item);
                    break;
                case XML_SCHEMA_TYPE_SEQUENCE:
                case XML_SCHEMA_TYPE_CHOICE:
                case XML_SCHEMA_TYPE_ALL:
                    xmlSchemaFreeModelGroup((xmlSchemaModelGroupPtr) item);
                    break;
                case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
                    xmlSchemaFreeAttributeGroup(
                        (xmlSchemaAttributeGroupPtr) item);
                    break;
                case XML_SCHEMA_TYPE_GROUP:
                    xmlSchemaFreeModelGroupDef(
                        (xmlSchemaModelGroupDefPtr) item);
                    break;
                case XML_SCHEMA_TYPE_ANY:
                case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
                    xmlSchemaFreeWildcard((xmlSchemaWildcardPtr) item);
                    break;
                case XML_SCHEMA_TYPE_IDC_KEY:
                case XML_SCHEMA_TYPE_IDC_UNIQUE:
                case XML_SCHEMA_TYPE_IDC_KEYREF:
                    xmlSchemaFreeIDC((xmlSchemaIDCPtr) item);
                    break;
                case XML_SCHEMA_TYPE_NOTATION:
                    xmlSchemaFreeNotation((xmlSchemaNotationPtr) item);
                    break;
                case XML_SCHEMA_EXTRA_QNAMEREF:
                    xmlSchemaFreeQNameRef((xmlSchemaQNameRefPtr) item);
                    break;
                default: {
                    /* TODO: This should never be hit. */
                    xmlSchemaPSimpleInternalErr(NULL,
                        "Internal error: xmlSchemaComponentListFree, "
                        "unexpected component type '%s'\n",
                        (const xmlChar *) WXS_ITEM_TYPE_NAME(item));
                         }
                    break;
            }
        }
        list->nbItems = 0;
    }
}

/**
 * xmlSchemaFree:
 * @schema:  a schema structure
 *
 * Deallocate a Schema structure.
 */
void
xmlSchemaFree(xmlSchemaPtr schema)
{
    if (schema == NULL)
        return;
    /* @volatiles is not used anymore :-/ */
    if (schema->volatiles != NULL)
        TODO
    /*
    * Note that those slots are not responsible for freeing
    * schema components anymore; this will now be done by
    * the schema buckets.
    */
    if (schema->notaDecl != NULL)
        xmlHashFree(schema->notaDecl, NULL);
    if (schema->attrDecl != NULL)
        xmlHashFree(schema->attrDecl, NULL);
    if (schema->attrgrpDecl != NULL)
        xmlHashFree(schema->attrgrpDecl, NULL);
    if (schema->elemDecl != NULL)
        xmlHashFree(schema->elemDecl, NULL);
    if (schema->typeDecl != NULL)
        xmlHashFree(schema->typeDecl, NULL);
    if (schema->groupDecl != NULL)
        xmlHashFree(schema->groupDecl, NULL);
    if (schema->idcDef != NULL)
        xmlHashFree(schema->idcDef, NULL);

    if (schema->schemasImports != NULL)
        xmlHashFree(schema->schemasImports,
                    (xmlHashDeallocator) xmlSchemaBucketFree);
    if (schema->includes != NULL) {
        xmlSchemaItemListPtr list = (xmlSchemaItemListPtr) schema->includes;
        int i;
        for (i = 0; i < list->nbItems; i++) {
            xmlSchemaBucketFree((xmlSchemaBucketPtr) list->items[i]);   
        }
        xmlSchemaItemListFree(list);
    }
    if (schema->annot != NULL)
        xmlSchemaFreeAnnot(schema->annot);
    /* Never free the doc here, since this will be done by the buckets. */

    xmlDictFree(schema->dict);
    xmlFree(schema);
}

/************************************************************************
 *                                                                      *
 *                      Debug functions                                 *
 *                                                                      *
 ************************************************************************/

#ifdef LIBXML_OUTPUT_ENABLED

static void
xmlSchemaTypeDump(xmlSchemaTypePtr type, FILE * output); /* forward */

/**
 * xmlSchemaElementDump:
 * @elem:  an element
 * @output:  the file output
 *
 * Dump the element
 */
static void
xmlSchemaElementDump(xmlSchemaElementPtr elem, FILE * output,
                     const xmlChar * name ATTRIBUTE_UNUSED,
                     const xmlChar * namespace ATTRIBUTE_UNUSED,
                     const xmlChar * context ATTRIBUTE_UNUSED)
{
    if (elem == NULL)
        return;


    fprintf(output, "Element");
    if (elem->flags & XML_SCHEMAS_ELEM_GLOBAL)
        fprintf(output, " (global)");
    fprintf(output, ": '%s' ", elem->name);
    if (namespace != NULL)
        fprintf(output, "ns '%s'", namespace);
    fprintf(output, "\n");
#if 0
    if ((elem->minOccurs != 1) || (elem->maxOccurs != 1)) {
        fprintf(output, "  min %d ", elem->minOccurs);
        if (elem->maxOccurs >= UNBOUNDED)
            fprintf(output, "max: unbounded\n");
        else if (elem->maxOccurs != 1)
            fprintf(output, "max: %d\n", elem->maxOccurs);
        else
            fprintf(output, "\n");
    }
#endif
    /*
    * Misc other properties.
    */
    if ((elem->flags & XML_SCHEMAS_ELEM_NILLABLE) ||
        (elem->flags & XML_SCHEMAS_ELEM_ABSTRACT) ||
        (elem->flags & XML_SCHEMAS_ELEM_FIXED) ||
        (elem->flags & XML_SCHEMAS_ELEM_DEFAULT)) {
        fprintf(output, "  props: ");
        if (elem->flags & XML_SCHEMAS_ELEM_FIXED)
            fprintf(output, "[fixed] ");
        if (elem->flags & XML_SCHEMAS_ELEM_DEFAULT)
            fprintf(output, "[default] ");
        if (elem->flags & XML_SCHEMAS_ELEM_ABSTRACT)
            fprintf(output, "[abstract] ");
        if (elem->flags & XML_SCHEMAS_ELEM_NILLABLE)
            fprintf(output, "[nillable] ");
        fprintf(output, "\n");
    }
    /*
    * Default/fixed value.
    */
    if (elem->value != NULL)
        fprintf(output, "  value: '%s'\n", elem->value);
    /*
    * Type.
    */
    if (elem->namedType != NULL) {
        fprintf(output, "  type: '%s' ", elem->namedType);
        if (elem->namedTypeNs != NULL)
            fprintf(output, "ns '%s'\n", elem->namedTypeNs);
        else
            fprintf(output, "\n");
    } else if (elem->subtypes != NULL) {
        /*
        * Dump local types.
        */
        xmlSchemaTypeDump(elem->subtypes, output);
    }
    /*
    * Substitution group.
    */
    if (elem->substGroup != NULL) {
        fprintf(output, "  substitutionGroup: '%s' ", elem->substGroup);
        if (elem->substGroupNs != NULL)
            fprintf(output, "ns '%s'\n", elem->substGroupNs);
        else
            fprintf(output, "\n");
    }
}

/**
 * xmlSchemaAnnotDump:
 * @output:  the file output
 * @annot:  a annotation
 *
 * Dump the annotation
 */
static void
xmlSchemaAnnotDump(FILE * output, xmlSchemaAnnotPtr annot)
{
    xmlChar *content;

    if (annot == NULL)
        return;

    content = xmlNodeGetContent(annot->content);
    if (content != NULL) {
        fprintf(output, "  Annot: %s\n", content);
        xmlFree(content);
    } else
        fprintf(output, "  Annot: empty\n");
}

/**
 * xmlSchemaContentModelDump:
 * @particle: the schema particle
 * @output: the file output
 * @depth: the depth used for intentation
 *
 * Dump a SchemaType structure
 */
static void
xmlSchemaContentModelDump(xmlSchemaParticlePtr particle, FILE * output, int depth)
{
    xmlChar *str = NULL;
    xmlSchemaTreeItemPtr term;
    char shift[100];
    int i;

    if (particle == NULL)
        return;
    for (i = 0;((i < depth) && (i < 25));i++)
        shift[2 * i] = shift[2 * i + 1] = ' ';
    shift[2 * i] = shift[2 * i + 1] = 0;
    fprintf(output, shift);
    if (particle->children == NULL) {
        fprintf(output, "MISSING particle term\n");
        return;
    }
    term = particle->children;
    if (term == NULL) {
        fprintf(output, "(NULL)");
    } else {
        switch (term->type) {
            case XML_SCHEMA_TYPE_ELEMENT:
                fprintf(output, "ELEM '%s'", xmlSchemaFormatQName(&str,
                    ((xmlSchemaElementPtr)term)->targetNamespace,
                    ((xmlSchemaElementPtr)term)->name));
                FREE_AND_NULL(str);
                break;
            case XML_SCHEMA_TYPE_SEQUENCE:
                fprintf(output, "SEQUENCE");
                break;
            case XML_SCHEMA_TYPE_CHOICE:
                fprintf(output, "CHOICE");
                break;
            case XML_SCHEMA_TYPE_ALL:
                fprintf(output, "ALL");
                break;
            case XML_SCHEMA_TYPE_ANY:
                fprintf(output, "ANY");
                break;
            default:
                fprintf(output, "UNKNOWN\n");
                return;
        }
    }
    if (particle->minOccurs != 1)
        fprintf(output, " min: %d", particle->minOccurs);
    if (particle->maxOccurs >= UNBOUNDED)
        fprintf(output, " max: unbounded");
    else if (particle->maxOccurs != 1)
        fprintf(output, " max: %d", particle->maxOccurs);
    fprintf(output, "\n");
    if (term &&
        ((term->type == XML_SCHEMA_TYPE_SEQUENCE) ||
         (term->type == XML_SCHEMA_TYPE_CHOICE) ||
         (term->type == XML_SCHEMA_TYPE_ALL)) &&
         (term->children != NULL)) {
        xmlSchemaContentModelDump((xmlSchemaParticlePtr) term->children,
            output, depth +1);
    }
    if (particle->next != NULL)
        xmlSchemaContentModelDump((xmlSchemaParticlePtr) particle->next,
                output, depth);
}

/**
 * xmlSchemaAttrUsesDump:
 * @uses:  attribute uses list
 * @output:  the file output 
 *
 * Dumps a list of attribute use components.
 */
static void
xmlSchemaAttrUsesDump(xmlSchemaItemListPtr uses, FILE * output)
{
    xmlSchemaAttributeUsePtr use;
    xmlSchemaAttributeUseProhibPtr prohib;
    xmlSchemaQNameRefPtr ref;
    const xmlChar *name, *tns;
    xmlChar *str = NULL;
    int i;

    if ((uses == NULL) || (uses->nbItems == 0))
        return;

    fprintf(output, "  attributes:\n");    
    for (i = 0; i < uses->nbItems; i++) {
        use = uses->items[i];
        if (use->type == XML_SCHEMA_EXTRA_ATTR_USE_PROHIB) {
            fprintf(output, "  [prohibition] ");
            prohib = (xmlSchemaAttributeUseProhibPtr) use;
            name = prohib->name;
            tns = prohib->targetNamespace;
        } else if (use->type == XML_SCHEMA_EXTRA_QNAMEREF) {
            fprintf(output, "  [reference] ");
            ref = (xmlSchemaQNameRefPtr) use;
            name = ref->name;
            tns = ref->targetNamespace;
        } else {
            fprintf(output, "  [use] ");
            name = WXS_ATTRUSE_DECL_NAME(use);
            tns = WXS_ATTRUSE_DECL_TNS(use);
        }
        fprintf(output, "'%s'\n",
            (const char *) xmlSchemaFormatQName(&str, tns, name));
        FREE_AND_NULL(str);
    }
}

/**
 * xmlSchemaTypeDump:
 * @output:  the file output
 * @type:  a type structure
 *
 * Dump a SchemaType structure
 */
static void
xmlSchemaTypeDump(xmlSchemaTypePtr type, FILE * output)
{
    if (type == NULL) {
        fprintf(output, "Type: NULL\n");
        return;
    }
    fprintf(output, "Type: ");
    if (type->name != NULL)
        fprintf(output, "'%s' ", type->name);
    else
        fprintf(output, "(no name) ");
    if (type->targetNamespace != NULL)
        fprintf(output, "ns '%s' ", type->targetNamespace);
    switch (type->type) {
        case XML_SCHEMA_TYPE_BASIC:
            fprintf(output, "[basic] ");
            break;
        case XML_SCHEMA_TYPE_SIMPLE:
            fprintf(output, "[simple] ");
            break;
        case XML_SCHEMA_TYPE_COMPLEX:
            fprintf(output, "[complex] ");
            break;
        case XML_SCHEMA_TYPE_SEQUENCE:
            fprintf(output, "[sequence] ");
            break;
        case XML_SCHEMA_TYPE_CHOICE:
            fprintf(output, "[choice] ");
            break;
        case XML_SCHEMA_TYPE_ALL:
            fprintf(output, "[all] ");
            break;
        case XML_SCHEMA_TYPE_UR:
            fprintf(output, "[ur] ");
            break;
        case XML_SCHEMA_TYPE_RESTRICTION:
            fprintf(output, "[restriction] ");
            break;
        case XML_SCHEMA_TYPE_EXTENSION:
            fprintf(output, "[extension] ");
            break;
        default:
            fprintf(output, "[unknown type %d] ", type->type);
            break;
    }
    fprintf(output, "content: ");
    switch (type->contentType) {
        case XML_SCHEMA_CONTENT_UNKNOWN:
            fprintf(output, "[unknown] ");
            break;
        case XML_SCHEMA_CONTENT_EMPTY:
            fprintf(output, "[empty] ");
            break;
        case XML_SCHEMA_CONTENT_ELEMENTS:
            fprintf(output, "[element] ");
            break;
        case XML_SCHEMA_CONTENT_MIXED:
            fprintf(output, "[mixed] ");
            break;
        case XML_SCHEMA_CONTENT_MIXED_OR_ELEMENTS:
        /* not used. */
            break;
        case XML_SCHEMA_CONTENT_BASIC:
            fprintf(output, "[basic] ");
            break;
        case XML_SCHEMA_CONTENT_SIMPLE:
            fprintf(output, "[simple] ");
            break;
        case XML_SCHEMA_CONTENT_ANY:
            fprintf(output, "[any] ");
            break;
    }
    fprintf(output, "\n");
    if (type->base != NULL) {
        fprintf(output, "  base type: '%s'", type->base);
        if (type->baseNs != NULL)
            fprintf(output, " ns '%s'\n", type->baseNs);
        else
            fprintf(output, "\n");
    }
    if (type->attrUses != NULL)
        xmlSchemaAttrUsesDump(type->attrUses, output);
    if (type->annot != NULL)
        xmlSchemaAnnotDump(output, type->annot);
#ifdef DUMP_CONTENT_MODEL
    if ((type->type == XML_SCHEMA_TYPE_COMPLEX) &&
        (type->subtypes != NULL)) {
        xmlSchemaContentModelDump((xmlSchemaParticlePtr) type->subtypes,
            output, 1);
    }
#endif
}

/**
 * xmlSchemaDump:
 * @output:  the file output
 * @schema:  a schema structure
 *
 * Dump a Schema structure.
 */
void
xmlSchemaDump(FILE * output, xmlSchemaPtr schema)
{
    if (output == NULL)
        return;
    if (schema == NULL) {
        fprintf(output, "Schemas: NULL\n");
        return;
    }
    fprintf(output, "Schemas: ");
    if (schema->name != NULL)
        fprintf(output, "%s, ", schema->name);
    else
        fprintf(output, "no name, ");
    if (schema->targetNamespace != NULL)
        fprintf(output, "%s", (const char *) schema->targetNamespace);
    else
        fprintf(output, "no target namespace");
    fprintf(output, "\n");
    if (schema->annot != NULL)
        xmlSchemaAnnotDump(output, schema->annot);
    xmlHashScan(schema->typeDecl, (xmlHashScanner) xmlSchemaTypeDump,
                output);
    xmlHashScanFull(schema->elemDecl,
                    (xmlHashScannerFull) xmlSchemaElementDump, output);
}

#ifdef DEBUG_IDC_NODE_TABLE
/**
 * xmlSchemaDebugDumpIDCTable:
 * @vctxt: the WXS validation context
 *
 * Displays the current IDC table for debug purposes.
 */
static void
xmlSchemaDebugDumpIDCTable(FILE * output,
                           const xmlChar *namespaceName,
                           const xmlChar *localName,
                           xmlSchemaPSVIIDCBindingPtr bind)
{
    xmlChar *str = NULL;
    const xmlChar *value;
    xmlSchemaPSVIIDCNodePtr tab;
    xmlSchemaPSVIIDCKeyPtr key;
    int i, j, res;

    fprintf(output, "IDC: TABLES on '%s'\n",
        xmlSchemaFormatQName(&str, namespaceName, localName));
    FREE_AND_NULL(str)

    if (bind == NULL)
        return;
    do {
        fprintf(output, "IDC:   BINDING '%s' (%d)\n",
            xmlSchemaGetComponentQName(&str, 
                bind->definition), bind->nbNodes);
        FREE_AND_NULL(str)
        for (i = 0; i < bind->nbNodes; i++) {
            tab = bind->nodeTable[i];
            fprintf(output, "         ( ");
            for (j = 0; j < bind->definition->nbFields; j++) {
                key = tab->keys[j];
                if ((key != NULL) && (key->val != NULL)) {
                    res = xmlSchemaGetCanonValue(key->val, &value);
                    if (res >= 0)
                        fprintf(output, "'%s' ", value);
                    else
                        fprintf(output, "CANON-VALUE-FAILED ");
                    if (res == 0)
                        FREE_AND_NULL(value)
                } else if (key != NULL)
                    fprintf(output, "(no val), ");
                else
                    fprintf(output, "(key missing), ");
            }
            fprintf(output, ")\n");
        }
        if (bind->dupls && bind->dupls->nbItems) {
            fprintf(output, "IDC:     dupls (%d):\n", bind->dupls->nbItems);
            for (i = 0; i < bind->dupls->nbItems; i++) {
                tab = bind->dupls->items[i];
                fprintf(output, "         ( ");
                for (j = 0; j < bind->definition->nbFields; j++) {
                    key = tab->keys[j];
                    if ((key != NULL) && (key->val != NULL)) {
                        res = xmlSchemaGetCanonValue(key->val, &value);
                        if (res >= 0)
                            fprintf(output, "'%s' ", value);
                        else
                            fprintf(output, "CANON-VALUE-FAILED ");
                        if (res == 0)
                            FREE_AND_NULL(value)
                    } else if (key != NULL)
                    fprintf(output, "(no val), ");
                        else
                            fprintf(output, "(key missing), ");
                }
                fprintf(output, ")\n");
            }
        }
        bind = bind->next;
    } while (bind != NULL);
}
#endif /* DEBUG_IDC */
#endif /* LIBXML_OUTPUT_ENABLED */

/************************************************************************
 *                                                                      *
 *                      Utilities                                       *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSchemaGetPropNode:
 * @node: the element node
 * @name: the name of the attribute
 *
 * Seeks an attribute with a name of @name in
 * no namespace.
 *
 * Returns the attribute or NULL if not present.
 */
static xmlAttrPtr
xmlSchemaGetPropNode(xmlNodePtr node, const char *name)
{
    xmlAttrPtr prop;

    if ((node == NULL) || (name == NULL))
        return(NULL);
    prop = node->properties;
    while (prop != NULL) {
        if ((prop->ns == NULL) && xmlStrEqual(prop->name, BAD_CAST name))
            return(prop);
        prop = prop->next;
    }
    return (NULL);
}

/**
 * xmlSchemaGetPropNodeNs:
 * @node: the element node
 * @uri: the uri
 * @name: the name of the attribute
 *
 * Seeks an attribute with a local name of @name and
 * a namespace URI of @uri.
 *
 * Returns the attribute or NULL if not present.
 */
static xmlAttrPtr
xmlSchemaGetPropNodeNs(xmlNodePtr node, const char *uri, const char *name)
{
    xmlAttrPtr prop;

    if ((node == NULL) || (name == NULL))
        return(NULL);    
    prop = node->properties;
    while (prop != NULL) {
        if ((prop->ns != NULL) &&
            xmlStrEqual(prop->name, BAD_CAST name) &&
            xmlStrEqual(prop->ns->href, BAD_CAST uri))
            return(prop);
        prop = prop->next;
    }
    return (NULL);
}

static const xmlChar *
xmlSchemaGetNodeContent(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node)
{
    xmlChar *val;
    const xmlChar *ret;

    val = xmlNodeGetContent(node);
    if (val == NULL)
        val = xmlStrdup((xmlChar *)"");
    ret = xmlDictLookup(ctxt->dict, val, -1);
    xmlFree(val);
    return(ret);
}

static const xmlChar *
xmlSchemaGetNodeContentNoDict(xmlNodePtr node)
{
    return((const xmlChar*) xmlNodeGetContent(node));
}

/**
 * xmlSchemaGetProp:
 * @ctxt: the parser context
 * @node: the node
 * @name: the property name
 *
 * Read a attribute value and internalize the string
 *
 * Returns the string or NULL if not present.
 */
static const xmlChar *
xmlSchemaGetProp(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node,
                 const char *name)
{
    xmlChar *val;
    const xmlChar *ret;

    val = xmlGetNoNsProp(node, BAD_CAST name);
    if (val == NULL)
        return(NULL);
    ret = xmlDictLookup(ctxt->dict, val, -1);
    xmlFree(val);
    return(ret);
}

/************************************************************************
 *                                                                      *
 *                      Parsing functions                               *
 *                                                                      *
 ************************************************************************/

#define WXS_FIND_GLOBAL_ITEM(slot)                      \
    if (xmlStrEqual(nsName, schema->targetNamespace)) { \
        ret = xmlHashLookup(schema->slot, name); \
        if (ret != NULL) goto exit; \
    } \
    if (xmlHashSize(schema->schemasImports) > 1) { \
        xmlSchemaImportPtr import; \
        if (nsName == NULL) \
            import = xmlHashLookup(schema->schemasImports, \
                XML_SCHEMAS_NO_NAMESPACE); \
        else \
            import = xmlHashLookup(schema->schemasImports, nsName); \
        if (import == NULL) \
            goto exit; \
        ret = xmlHashLookup(import->schema->slot, name); \
    }

/**
 * xmlSchemaGetElem:
 * @schema:  the schema context
 * @name:  the element name
 * @ns:  the element namespace
 *
 * Lookup a global element declaration in the schema.
 *
 * Returns the element declaration or NULL if not found.
 */
static xmlSchemaElementPtr
xmlSchemaGetElem(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaElementPtr ret = NULL;
    
    if ((name == NULL) || (schema == NULL))
        return(NULL);
    if (schema != NULL) {
        WXS_FIND_GLOBAL_ITEM(elemDecl)
    }   
exit:
#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup element decl. %s", name);
        else
            fprintf(stderr, "Unable to lookup element decl. %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

/**
 * xmlSchemaGetType:
 * @schema:  the main schema
 * @name:  the type's name
 * nsName:  the type's namespace
 *
 * Lookup a type in the schemas or the predefined types
 *
 * Returns the group definition or NULL if not found.
 */
static xmlSchemaTypePtr
xmlSchemaGetType(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaTypePtr ret = NULL;

    if (name == NULL)
        return (NULL);    
    /* First try the built-in types. */
    if ((nsName != NULL) && xmlStrEqual(nsName, xmlSchemaNs)) { 
        ret = xmlSchemaGetPredefinedType(name, nsName);
        if (ret != NULL)
            goto exit;
        /*
        * Note that we try the parsed schemas as well here
        * since one might have parsed the S4S, which contain more
        * than the built-in types.
        * TODO: Can we optimize this?
        */
    }
    if (schema != NULL) {
        WXS_FIND_GLOBAL_ITEM(typeDecl)
    } 
exit:

#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup type %s", name);
        else
            fprintf(stderr, "Unable to lookup type %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

/**
 * xmlSchemaGetAttributeDecl:
 * @schema:  the context of the schema
 * @name:  the name of the attribute
 * @ns:  the target namespace of the attribute
 *
 * Lookup a an attribute in the schema or imported schemas
 *
 * Returns the attribute declaration or NULL if not found.
 */
static xmlSchemaAttributePtr
xmlSchemaGetAttributeDecl(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaAttributePtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
        WXS_FIND_GLOBAL_ITEM(attrDecl)
    }
exit:
#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup attribute %s", name);
        else
            fprintf(stderr, "Unable to lookup attribute %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

/**
 * xmlSchemaGetAttributeGroup:
 * @schema:  the context of the schema
 * @name:  the name of the attribute group
 * @ns:  the target namespace of the attribute group
 *
 * Lookup a an attribute group in the schema or imported schemas
 *
 * Returns the attribute group definition or NULL if not found.
 */
static xmlSchemaAttributeGroupPtr
xmlSchemaGetAttributeGroup(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaAttributeGroupPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
        WXS_FIND_GLOBAL_ITEM(attrgrpDecl)
    }
exit:
    /* TODO:
    if ((ret != NULL) && (ret->redef != NULL)) {
        * Return the last redefinition. *
        ret = ret->redef;
    }
    */
#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup attribute group %s", name);
        else
            fprintf(stderr, "Unable to lookup attribute group %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

/**
 * xmlSchemaGetGroup:
 * @schema:  the context of the schema
 * @name:  the name of the group
 * @ns:  the target namespace of the group
 *
 * Lookup a group in the schema or imported schemas
 *
 * Returns the group definition or NULL if not found.
 */
static xmlSchemaModelGroupDefPtr
xmlSchemaGetGroup(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaModelGroupDefPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
        WXS_FIND_GLOBAL_ITEM(groupDecl)
    }
exit:
    
#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup group %s", name);
        else
            fprintf(stderr, "Unable to lookup group %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

static xmlSchemaNotationPtr
xmlSchemaGetNotation(xmlSchemaPtr schema,
                     const xmlChar *name,
                     const xmlChar *nsName)
{
    xmlSchemaNotationPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
        WXS_FIND_GLOBAL_ITEM(notaDecl)
    }
exit:
    return (ret);
}

static xmlSchemaIDCPtr
xmlSchemaGetIDC(xmlSchemaPtr schema,
                const xmlChar *name,
                const xmlChar *nsName)
{
    xmlSchemaIDCPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
        WXS_FIND_GLOBAL_ITEM(idcDef)
    }
exit:
    return (ret);
}

/**
 * xmlSchemaGetNamedComponent:
 * @schema:  the schema
 * @name:  the name of the group
 * @ns:  the target namespace of the group
 *
 * Lookup a group in the schema or imported schemas
 *
 * Returns the group definition or NULL if not found.
 */
static xmlSchemaBasicItemPtr
xmlSchemaGetNamedComponent(xmlSchemaPtr schema,
                           xmlSchemaTypeType itemType,
                           const xmlChar *name,
                           const xmlChar *targetNs)
{
    switch (itemType) {
        case XML_SCHEMA_TYPE_GROUP:
            return ((xmlSchemaBasicItemPtr) xmlSchemaGetGroup(schema,
                name, targetNs));
        case XML_SCHEMA_TYPE_ELEMENT:
            return ((xmlSchemaBasicItemPtr) xmlSchemaGetElem(schema,
                name, targetNs));
        default:
            TODO
            return (NULL);
    }
}

/************************************************************************
 *                                                                      *
 *                      Parsing functions                               *
 *                                                                      *
 ************************************************************************/

#define IS_BLANK_NODE(n)                                                \
    (((n)->type == XML_TEXT_NODE) && (xmlSchemaIsBlank((n)->content, -1)))

/**
 * xmlSchemaIsBlank:
 * @str:  a string
 * @len: the length of the string or -1
 *
 * Check if a string is ignorable
 *
 * Returns 1 if the string is NULL or made of blanks chars, 0 otherwise
 */
static int
xmlSchemaIsBlank(xmlChar * str, int len)
{
    if (str == NULL)
        return (1);
    if (len < 0) {
        while (*str != 0) {
            if (!(IS_BLANK_CH(*str)))
                return (0);
            str++;
        }
    } else while ((*str != 0) && (len != 0)) {
        if (!(IS_BLANK_CH(*str)))
            return (0);
        str++;
        len--;
    }
    
    return (1);
}

#define WXS_COMP_NAME(c, t) ((t) (c))->name
#define WXS_COMP_TNS(c, t) ((t) (c))->targetNamespace
/*
* xmlSchemaFindRedefCompInGraph:
* ATTENTION TODO: This uses pointer comp. for strings.
*/
static xmlSchemaBasicItemPtr
xmlSchemaFindRedefCompInGraph(xmlSchemaBucketPtr bucket,
                              xmlSchemaTypeType type,
                              const xmlChar *name,
                              const xmlChar *nsName)
{
    xmlSchemaBasicItemPtr ret;
    int i;

    if ((bucket == NULL) || (name == NULL))
        return(NULL);
    if ((bucket->globals == NULL) ||
        (bucket->globals->nbItems == 0))
        goto subschemas;
    /*
    * Search in global components.
    */
    for (i = 0; i < bucket->globals->nbItems; i++) {
        ret = bucket->globals->items[i];
        if (ret->type == type) {
            switch (type) {
                case XML_SCHEMA_TYPE_COMPLEX:
                case XML_SCHEMA_TYPE_SIMPLE:
                    if ((WXS_COMP_NAME(ret, xmlSchemaTypePtr) == name) &&
                        (WXS_COMP_TNS(ret, xmlSchemaTypePtr) ==
                        nsName))
                    {
                        return(ret);
                    }
                    break;
                case XML_SCHEMA_TYPE_GROUP:
                    if ((WXS_COMP_NAME(ret,
                            xmlSchemaModelGroupDefPtr) == name) &&
                        (WXS_COMP_TNS(ret,
                            xmlSchemaModelGroupDefPtr) == nsName))
                    {
                        return(ret);
                    }
                    break;
                case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
                    if ((WXS_COMP_NAME(ret,
                            xmlSchemaAttributeGroupPtr) == name) &&
                        (WXS_COMP_TNS(ret,
                            xmlSchemaAttributeGroupPtr) == nsName))
                    {
                        return(ret);
                    }
                    break;
                default:
                    /* Should not be hit. */
                    return(NULL);
            }           
        }
    }
subschemas:
    /*
    * Process imported/included schemas.
    */
    if (bucket->relations != NULL) {
        xmlSchemaSchemaRelationPtr rel = bucket->relations;

        /*
        * TODO: Marking the bucket will not avoid multiple searches
        * in the same schema, but avoids at least circularity.
        */
        bucket->flags |= XML_SCHEMA_BUCKET_MARKED;
        do {
            if ((rel->bucket != NULL) &&
                ((rel->bucket->flags & XML_SCHEMA_BUCKET_MARKED) == 0)) {
                ret = xmlSchemaFindRedefCompInGraph(rel->bucket,
                    type, name, nsName);
                if (ret != NULL)
                    return(ret);
            }
            rel = rel->next;
        } while (rel != NULL);
         bucket->flags ^= XML_SCHEMA_BUCKET_MARKED;
    }
    return(NULL);
}

/**
 * xmlSchemaAddNotation:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 *
 * Add an XML schema annotation declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaNotationPtr
xmlSchemaAddNotation(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                     const xmlChar *name, const xmlChar *nsName,
                     xmlNodePtr node ATTRIBUTE_UNUSED)
{
    xmlSchemaNotationPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaNotationPtr) xmlMalloc(sizeof(xmlSchemaNotation));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "add annotation", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaNotation));
    ret->type = XML_SCHEMA_TYPE_NOTATION;
    ret->name = name;
    ret->targetNamespace = nsName;
    /* TODO: do we need the node to be set?
    * ret->node = node;*/
    WXS_ADD_GLOBAL(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddAttribute:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 * @namespace:  the namespace
 *
 * Add an XML schema Attrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaAttributePtr
xmlSchemaAddAttribute(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                      const xmlChar * name, const xmlChar * nsName,
                      xmlNodePtr node, int topLevel)
{
    xmlSchemaAttributePtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL))
        return (NULL);

    ret = (xmlSchemaAttributePtr) xmlMalloc(sizeof(xmlSchemaAttribute));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating attribute", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAttribute));
    ret->type = XML_SCHEMA_TYPE_ATTRIBUTE;
    ret->node = node;
    ret->name = name;
    ret->targetNamespace = nsName;

    if (topLevel)
        WXS_ADD_GLOBAL(ctxt, ret);
    else
        WXS_ADD_LOCAL(ctxt, ret);
    WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddAttributeUse:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 * @namespace:  the namespace
 *
 * Add an XML schema Attrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaAttributeUsePtr
xmlSchemaAddAttributeUse(xmlSchemaParserCtxtPtr pctxt,
                         xmlNodePtr node)
{
    xmlSchemaAttributeUsePtr ret = NULL;

    if (pctxt == NULL)
        return (NULL);

    ret = (xmlSchemaAttributeUsePtr) xmlMalloc(sizeof(xmlSchemaAttributeUse));
    if (ret == NULL) {
        xmlSchemaPErrMemory(pctxt, "allocating attribute", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAttributeUse));
    ret->type = XML_SCHEMA_TYPE_ATTRIBUTE_USE;
    ret->node = node;

    WXS_ADD_LOCAL(pctxt, ret);
    return (ret);
}

/*
* xmlSchemaAddRedef:
*
* Adds a redefinition information. This is used at a later stage to:
* resolve references to the redefined components and to check constraints.
*/
static xmlSchemaRedefPtr
xmlSchemaAddRedef(xmlSchemaParserCtxtPtr pctxt,           
                  xmlSchemaBucketPtr targetBucket,
                  void *item,
                  const xmlChar *refName,
                  const xmlChar *refTargetNs)
{
    xmlSchemaRedefPtr ret;

    ret = (xmlSchemaRedefPtr)
        xmlMalloc(sizeof(xmlSchemaRedef));
    if (ret == NULL) {
        xmlSchemaPErrMemory(pctxt,
            "allocating redefinition info", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaRedef));
    ret->item = item;
    ret->targetBucket = targetBucket;
    ret->refName = refName;
    ret->refTargetNs = refTargetNs;
    if (WXS_CONSTRUCTOR(pctxt)->redefs == NULL)
        WXS_CONSTRUCTOR(pctxt)->redefs = ret;
    else
        WXS_CONSTRUCTOR(pctxt)->lastRedef->next = ret;
    WXS_CONSTRUCTOR(pctxt)->lastRedef = ret;

    return (ret);
}

/**
 * xmlSchemaAddAttributeGroupDefinition:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 * @nsName:  the target namespace
 * @node: the corresponding node
 *
 * Add an XML schema Attrribute Group definition.
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaAttributeGroupPtr
xmlSchemaAddAttributeGroupDefinition(xmlSchemaParserCtxtPtr pctxt,
                           xmlSchemaPtr schema ATTRIBUTE_UNUSED,
                           const xmlChar *name,
                           const xmlChar *nsName,
                           xmlNodePtr node)
{
    xmlSchemaAttributeGroupPtr ret = NULL;

    if ((pctxt == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaAttributeGroupPtr)
        xmlMalloc(sizeof(xmlSchemaAttributeGroup));
    if (ret == NULL) {
        xmlSchemaPErrMemory(pctxt, "allocating attribute group", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAttributeGroup));
    ret->type = XML_SCHEMA_TYPE_ATTRIBUTEGROUP;
    ret->name = name;
    ret->targetNamespace = nsName;
    ret->node = node;   

    /* TODO: Remove the flag. */
    ret->flags |= XML_SCHEMAS_ATTRGROUP_GLOBAL;
    if (pctxt->isRedefine) {
        pctxt->redef = xmlSchemaAddRedef(pctxt, pctxt->redefined,
            ret, name, nsName);
        if (pctxt->redef == NULL) {
            xmlFree(ret);
            return(NULL);
        }           
        pctxt->redefCounter = 0;
    }
    WXS_ADD_GLOBAL(pctxt, ret);
    WXS_ADD_PENDING(pctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddElement:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the type name
 * @namespace:  the type namespace
 *
 * Add an XML schema Element declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaElementPtr
xmlSchemaAddElement(xmlSchemaParserCtxtPtr ctxt,
                    const xmlChar * name, const xmlChar * nsName,
                    xmlNodePtr node, int topLevel)
{
    xmlSchemaElementPtr ret = NULL;

    if ((ctxt == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaElementPtr) xmlMalloc(sizeof(xmlSchemaElement));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating element", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaElement));
    ret->type = XML_SCHEMA_TYPE_ELEMENT;
    ret->name = name;
    ret->targetNamespace = nsName;
    ret->node = node;

    if (topLevel)
        WXS_ADD_GLOBAL(ctxt, ret);
    else
        WXS_ADD_LOCAL(ctxt, ret);
    WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddType:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 * @namespace:  the namespace
 *
 * Add an XML schema item
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaTypePtr
xmlSchemaAddType(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                 xmlSchemaTypeType type,
                 const xmlChar * name, const xmlChar * nsName,
                 xmlNodePtr node, int topLevel)
{
    xmlSchemaTypePtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL))
        return (NULL);

    ret = (xmlSchemaTypePtr) xmlMalloc(sizeof(xmlSchemaType));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating type", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaType));
    ret->type = type;
    ret->name = name;
    ret->targetNamespace = nsName;
    ret->node = node;
    if (topLevel) {
        if (ctxt->isRedefine) {
            ctxt->redef = xmlSchemaAddRedef(ctxt, ctxt->redefined,
                ret, name, nsName);
            if (ctxt->redef == NULL) {
                xmlFree(ret);
                return(NULL);
            }       
            ctxt->redefCounter = 0;
        }
        WXS_ADD_GLOBAL(ctxt, ret);
    } else
        WXS_ADD_LOCAL(ctxt, ret);
    WXS_ADD_PENDING(ctxt, ret);    
    return (ret);
}

static xmlSchemaQNameRefPtr
xmlSchemaNewQNameRef(xmlSchemaParserCtxtPtr pctxt,
                     xmlSchemaTypeType refType,
                     const xmlChar *refName,
                     const xmlChar *refNs)
{
    xmlSchemaQNameRefPtr ret;

    ret = (xmlSchemaQNameRefPtr)
        xmlMalloc(sizeof(xmlSchemaQNameRef));
    if (ret == NULL) {
        xmlSchemaPErrMemory(pctxt,
            "allocating QName reference item", NULL);
        return (NULL);
    }
    ret->node = NULL;
    ret->type = XML_SCHEMA_EXTRA_QNAMEREF;
    ret->name = refName;
    ret->targetNamespace = refNs;
    ret->item = NULL;
    ret->itemType = refType;
    /*
    * Store the reference item in the schema.
    */
    WXS_ADD_LOCAL(pctxt, ret);
    return (ret);
}

static xmlSchemaAttributeUseProhibPtr
xmlSchemaAddAttributeUseProhib(xmlSchemaParserCtxtPtr pctxt)
{
    xmlSchemaAttributeUseProhibPtr ret;

    ret = (xmlSchemaAttributeUseProhibPtr)
        xmlMalloc(sizeof(xmlSchemaAttributeUseProhib));
    if (ret == NULL) {
        xmlSchemaPErrMemory(pctxt,
            "allocating attribute use prohibition", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAttributeUseProhib));
    ret->type = XML_SCHEMA_EXTRA_ATTR_USE_PROHIB;
    WXS_ADD_LOCAL(pctxt, ret);
    return (ret);
}


/**
 * xmlSchemaAddModelGroup:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @type: the "compositor" type of the model group
 * @node: the node in the schema doc
 *
 * Adds a schema model group
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaModelGroupPtr
xmlSchemaAddModelGroup(xmlSchemaParserCtxtPtr ctxt,
                       xmlSchemaPtr schema,
                       xmlSchemaTypeType type,
                       xmlNodePtr node)
{
    xmlSchemaModelGroupPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL))
        return (NULL);

    ret = (xmlSchemaModelGroupPtr)
        xmlMalloc(sizeof(xmlSchemaModelGroup));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating model group component",
            NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaModelGroup));
    ret->type = type;
    ret->node = node;
    WXS_ADD_LOCAL(ctxt, ret);
    if ((type == XML_SCHEMA_TYPE_SEQUENCE) ||
        (type == XML_SCHEMA_TYPE_CHOICE))
        WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}


/**
 * xmlSchemaAddParticle:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @node: the corresponding node in the schema doc
 * @min: the minOccurs
 * @max: the maxOccurs
 *
 * Adds an XML schema particle component.
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaParticlePtr
xmlSchemaAddParticle(xmlSchemaParserCtxtPtr ctxt,
                     xmlNodePtr node, int min, int max)
{
    xmlSchemaParticlePtr ret = NULL;
    if (ctxt == NULL)
        return (NULL);

#ifdef DEBUG
    fprintf(stderr, "Adding particle component\n");
#endif
    ret = (xmlSchemaParticlePtr)
        xmlMalloc(sizeof(xmlSchemaParticle));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating particle component",
            NULL);
        return (NULL);
    }
    ret->type = XML_SCHEMA_TYPE_PARTICLE;
    ret->annot = NULL;
    ret->node = node;
    ret->minOccurs = min;
    ret->maxOccurs = max;
    ret->next = NULL;
    ret->children = NULL;

    WXS_ADD_LOCAL(ctxt, ret);
    /* 
    * Note that addition to pending components will be done locally
    * to the specific parsing function, since the most particles
    * need not to be fixed up (i.e. the reference to be resolved).
    * REMOVED: WXS_ADD_PENDING(ctxt, ret);
    */
    return (ret);
}

/**
 * xmlSchemaAddModelGroupDefinition:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @name:  the group name
 *
 * Add an XML schema Group definition
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaModelGroupDefPtr
xmlSchemaAddModelGroupDefinition(xmlSchemaParserCtxtPtr ctxt,
                                 xmlSchemaPtr schema,
                                 const xmlChar *name,
                                 const xmlChar *nsName,
                                 xmlNodePtr node)
{
    xmlSchemaModelGroupDefPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaModelGroupDefPtr)
        xmlMalloc(sizeof(xmlSchemaModelGroupDef));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "adding group", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaModelGroupDef));
    ret->name = name;
    ret->type = XML_SCHEMA_TYPE_GROUP;
    ret->node = node;
    ret->targetNamespace = nsName;

    if (ctxt->isRedefine) {
        ctxt->redef = xmlSchemaAddRedef(ctxt, ctxt->redefined,
            ret, name, nsName);
        if (ctxt->redef == NULL) {
            xmlFree(ret);
            return(NULL);
        }           
        ctxt->redefCounter = 0;
    }
    WXS_ADD_GLOBAL(ctxt, ret);
    WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaNewWildcardNs:
 * @ctxt:  a schema validation context
 *
 * Creates a new wildcard namespace constraint.
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaWildcardNsPtr
xmlSchemaNewWildcardNsConstraint(xmlSchemaParserCtxtPtr ctxt)
{
    xmlSchemaWildcardNsPtr ret;

    ret = (xmlSchemaWildcardNsPtr)
        xmlMalloc(sizeof(xmlSchemaWildcardNs));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "creating wildcard namespace constraint", NULL);
        return (NULL);
    }
    ret->value = NULL;
    ret->next = NULL;
    return (ret);
}

static xmlSchemaIDCPtr
xmlSchemaAddIDC(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                  const xmlChar *name, const xmlChar *nsName,
                  int category, xmlNodePtr node)
{
    xmlSchemaIDCPtr ret = NULL;    

    if ((ctxt == NULL) || (schema == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaIDCPtr) xmlMalloc(sizeof(xmlSchemaIDC));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt,
            "allocating an identity-constraint definition", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaIDC));
    /* The target namespace of the parent element declaration. */
    ret->targetNamespace = nsName;
    ret->name = name;
    ret->type = category;
    ret->node = node;        
    
    WXS_ADD_GLOBAL(ctxt, ret);
    /*
    * Only keyrefs need to be fixup up.
    */
    if (category == XML_SCHEMA_TYPE_IDC_KEYREF)
        WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddWildcard:
 * @ctxt:  a schema validation context
 * @schema: a schema
 *
 * Adds a wildcard.
 * It corresponds to a xsd:anyAttribute and xsd:any.
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaWildcardPtr
xmlSchemaAddWildcard(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                     xmlSchemaTypeType type, xmlNodePtr node)
{
    xmlSchemaWildcardPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL))
        return (NULL);

    ret = (xmlSchemaWildcardPtr) xmlMalloc(sizeof(xmlSchemaWildcard));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "adding wildcard", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaWildcard));
    ret->type = type;
    ret->node = node;    
    WXS_ADD_LOCAL(ctxt, ret);
    return (ret);
}

static void
xmlSchemaSubstGroupFree(xmlSchemaSubstGroupPtr group)
{
    if (group == NULL)
        return;
    if (group->members != NULL)
        xmlSchemaItemListFree(group->members);
    xmlFree(group);
}

static xmlSchemaSubstGroupPtr
xmlSchemaSubstGroupAdd(xmlSchemaParserCtxtPtr pctxt,
                       xmlSchemaElementPtr head)
{
    xmlSchemaSubstGroupPtr ret;

    /* Init subst group hash. */
    if (WXS_SUBST_GROUPS(pctxt) == NULL) {
        WXS_SUBST_GROUPS(pctxt) = xmlHashCreateDict(10, pctxt->dict);
        if (WXS_SUBST_GROUPS(pctxt) == NULL)
            return(NULL);
    }
    /* Create a new substitution group. */
    ret = (xmlSchemaSubstGroupPtr) xmlMalloc(sizeof(xmlSchemaSubstGroup));
    if (ret == NULL) {
        xmlSchemaPErrMemory(NULL,
            "allocating a substitution group container", NULL);
        return(NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaSubstGroup));
    ret->head = head;
    /* Create list of members. */
    ret->members = xmlSchemaItemListCreate();
    if (ret->members == NULL) {
        xmlSchemaSubstGroupFree(ret);
        return(NULL);
    }
    /* Add subst group to hash. */
    if (xmlHashAddEntry2(WXS_SUBST_GROUPS(pctxt),
        head->name, head->targetNamespace, ret) != 0) {
        PERROR_INT("xmlSchemaSubstGroupAdd",
            "failed to add a new substitution container");
        xmlSchemaSubstGroupFree(ret);
        return(NULL);
    }
    return(ret);
}

static xmlSchemaSubstGroupPtr
xmlSchemaSubstGroupGet(xmlSchemaParserCtxtPtr pctxt,
                       xmlSchemaElementPtr head)
{   
    if (WXS_SUBST_GROUPS(pctxt) == NULL)
        return(NULL);
    return(xmlHashLookup2(WXS_SUBST_GROUPS(pctxt),
        head->name, head->targetNamespace));

}

/**
 * xmlSchemaAddElementSubstitutionMember:
 * @pctxt:  a schema parser context
 * @head:  the head of the substitution group
 * @member: the new member of the substitution group
 *
 * Allocate a new annotation structure.
 *
 * Returns the newly allocated structure or NULL in case or error
 */
static int
xmlSchemaAddElementSubstitutionMember(xmlSchemaParserCtxtPtr pctxt,
                                      xmlSchemaElementPtr head,
                                      xmlSchemaElementPtr member)
{
    xmlSchemaSubstGroupPtr substGroup = NULL;

    if ((pctxt == NULL) || (head == NULL) || (member == NULL))
        return (-1);

    substGroup = xmlSchemaSubstGroupGet(pctxt, head);
    if (substGroup == NULL)
        substGroup = xmlSchemaSubstGroupAdd(pctxt, head);
    if (substGroup == NULL)
        return(-1);
    if (xmlSchemaItemListAdd(substGroup->members, member) == -1)
        return(-1);
    return(0);
}

/************************************************************************
 *                                                                      *
 *              Utilities for parsing                                   *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSchemaPValAttrNodeQNameValue:
 * @ctxt:  a schema parser context
 * @schema: the schema context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the parent as a schema object
 * @value:  the QName value
 * @local: the resulting local part if found, the attribute value otherwise
 * @uri:  the resulting namespace URI if found
 *
 * Extracts the local name and the URI of a QName value and validates it.
 * This one is intended to be used on attribute values that
 * should resolve to schema components.
 *
 * Returns 0, in case the QName is valid, a positive error code
 * if not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaPValAttrNodeQNameValue(xmlSchemaParserCtxtPtr ctxt,
                                       xmlSchemaPtr schema,
                                       xmlSchemaBasicItemPtr ownerItem,
                                       xmlAttrPtr attr,
                                       const xmlChar *value,
                                       const xmlChar **uri,
                                       const xmlChar **local)
{
    const xmlChar *pref;
    xmlNsPtr ns;
    int len, ret;

    *uri = NULL;
    *local = NULL;
    ret = xmlValidateQName(value, 1);
    if (ret > 0) {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            ownerItem, (xmlNodePtr) attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_QNAME),
            NULL, value, NULL, NULL, NULL);
        *local = value;
        return (ctxt->err);
    } else if (ret < 0)
        return (-1);

    if (!strchr((char *) value, ':')) {
        ns = xmlSearchNs(attr->doc, attr->parent, NULL);
        if (ns)
            *uri = xmlDictLookup(ctxt->dict, ns->href, -1);
        else if (schema->flags & XML_SCHEMAS_INCLUDING_CONVERT_NS) {
            /* TODO: move XML_SCHEMAS_INCLUDING_CONVERT_NS to the
            * parser context. */
            /*
            * This one takes care of included schemas with no
            * target namespace.
            */
            *uri = ctxt->targetNamespace;
        }
        *local = xmlDictLookup(ctxt->dict, value, -1);
        return (0);
    }
    /*
    * At this point xmlSplitQName3 has to return a local name.
    */
    *local = xmlSplitQName3(value, &len);
    *local = xmlDictLookup(ctxt->dict, *local, -1);
    pref = xmlDictLookup(ctxt->dict, value, len);
    ns = xmlSearchNs(attr->doc, attr->parent, pref);
    if (ns == NULL) {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            ownerItem, (xmlNodePtr) attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_QNAME), NULL, value,
            "The value '%s' of simple type 'xs:QName' has no "
            "corresponding namespace declaration in scope", value, NULL);
        return (ctxt->err);
    } else {
        *uri = xmlDictLookup(ctxt->dict, ns->href, -1);
    }
    return (0);
}

/**
 * xmlSchemaPValAttrNodeQName:
 * @ctxt:  a schema parser context
 * @schema: the schema context
 * @ownerDes: the designation of the owner element
 * @ownerItem: the owner as a schema object
 * @attr:  the attribute node
 * @local: the resulting local part if found, the attribute value otherwise
 * @uri:  the resulting namespace URI if found
 *
 * Extracts and validates the QName of an attribute value.
 * This one is intended to be used on attribute values that
 * should resolve to schema components.
 *
 * Returns 0, in case the QName is valid, a positive error code
 * if not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaPValAttrNodeQName(xmlSchemaParserCtxtPtr ctxt,
                                       xmlSchemaPtr schema,
                                       xmlSchemaBasicItemPtr ownerItem,
                                       xmlAttrPtr attr,
                                       const xmlChar **uri,
                                       const xmlChar **local)
{
    const xmlChar *value;

    value = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
    return (xmlSchemaPValAttrNodeQNameValue(ctxt, schema,
        ownerItem, attr, value, uri, local));
}

/**
 * xmlSchemaPValAttrQName:
 * @ctxt:  a schema parser context
 * @schema: the schema context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the owner as a schema object
 * @ownerElem:  the parent node of the attribute
 * @name:  the name of the attribute
 * @local: the resulting local part if found, the attribute value otherwise
 * @uri:  the resulting namespace URI if found
 *
 * Extracts and validates the QName of an attribute value.
 *
 * Returns 0, in case the QName is valid, a positive error code
 * if not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaPValAttrQName(xmlSchemaParserCtxtPtr ctxt,
                                   xmlSchemaPtr schema,
                                   xmlSchemaBasicItemPtr ownerItem,
                                   xmlNodePtr ownerElem,
                                   const char *name,
                                   const xmlChar **uri,
                                   const xmlChar **local)
{
    xmlAttrPtr attr;

    attr = xmlSchemaGetPropNode(ownerElem, name);
    if (attr == NULL) {
        *local = NULL;
        *uri = NULL;
        return (0);
    }
    return (xmlSchemaPValAttrNodeQName(ctxt, schema,
        ownerItem, attr, uri, local));
}

/**
 * xmlSchemaPValAttrID:
 * @ctxt:  a schema parser context
 * @schema: the schema context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the owner as a schema object
 * @ownerElem:  the parent node of the attribute
 * @name:  the name of the attribute
 *
 * Extracts and validates the ID of an attribute value.
 *
 * Returns 0, in case the ID is valid, a positive error code
 * if not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaPValAttrNodeID(xmlSchemaParserCtxtPtr ctxt, xmlAttrPtr attr)
{
    int ret;
    const xmlChar *value;

    if (attr == NULL)
        return(0);
    value = xmlSchemaGetNodeContentNoDict((xmlNodePtr) attr);
    ret = xmlValidateNCName(value, 1);
    if (ret == 0) {
        /*
        * NOTE: the IDness might have already be declared in the DTD
        */
        if (attr->atype != XML_ATTRIBUTE_ID) {
            xmlIDPtr res;
            xmlChar *strip;

            /*
            * TODO: Use xmlSchemaStrip here; it's not exported at this
            * moment.
            */
            strip = xmlSchemaCollapseString(value);
            if (strip != NULL) {
                xmlFree((xmlChar *) value);
                value = strip;
            }
            res = xmlAddID(NULL, attr->doc, value, attr);
            if (res == NULL) {
                ret = XML_SCHEMAP_S4S_ATTR_INVALID_VALUE;
                xmlSchemaPSimpleTypeErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                    NULL, (xmlNodePtr) attr,
                    xmlSchemaGetBuiltInType(XML_SCHEMAS_ID),
                    NULL, NULL, "Duplicate value '%s' of simple "
                    "type 'xs:ID'", value, NULL);
            } else
                attr->atype = XML_ATTRIBUTE_ID;
        }
    } else if (ret > 0) {
        ret = XML_SCHEMAP_S4S_ATTR_INVALID_VALUE;
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            NULL, (xmlNodePtr) attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_ID),
            NULL, NULL, "The value '%s' of simple type 'xs:ID' is "
            "not a valid 'xs:NCName'",
            value, NULL);
    }
    if (value != NULL)
        xmlFree((xmlChar *)value);

    return (ret);
}

static int
xmlSchemaPValAttrID(xmlSchemaParserCtxtPtr ctxt,
                    xmlNodePtr ownerElem,
                    const xmlChar *name)
{
    xmlAttrPtr attr;

    attr = xmlSchemaGetPropNode(ownerElem, (const char *) name);
    if (attr == NULL)
        return(0);
    return(xmlSchemaPValAttrNodeID(ctxt, attr));

}

/**
 * xmlGetMaxOccurs:
 * @ctxt:  a schema validation context
 * @node:  a subtree containing XML Schema informations
 *
 * Get the maxOccurs property
 *
 * Returns the default if not found, or the value
 */
static int
xmlGetMaxOccurs(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node,
                int min, int max, int def, const char *expected)
{
    const xmlChar *val, *cur;
    int ret = 0;
    xmlAttrPtr attr;

    attr = xmlSchemaGetPropNode(node, "maxOccurs");
    if (attr == NULL)
        return (def);
    val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);

    if (xmlStrEqual(val, (const xmlChar *) "unbounded")) {
        if (max != UNBOUNDED) {
            xmlSchemaPSimpleTypeErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                /* XML_SCHEMAP_INVALID_MINOCCURS, */
                NULL, (xmlNodePtr) attr, NULL, expected,
                val, NULL, NULL, NULL);
            return (def);
        } else
            return (UNBOUNDED);  /* encoding it with -1 might be another option */
    }

    cur = val;
    while (IS_BLANK_CH(*cur))
        cur++;
    if (*cur == 0) {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            /* XML_SCHEMAP_INVALID_MINOCCURS, */
            NULL, (xmlNodePtr) attr, NULL, expected,
            val, NULL, NULL, NULL);
        return (def);
    }
    while ((*cur >= '0') && (*cur <= '9')) {
        ret = ret * 10 + (*cur - '0');
        cur++;
    }
    while (IS_BLANK_CH(*cur))
        cur++;
    /*
    * TODO: Restrict the maximal value to Integer.
    */
    if ((*cur != 0) || (ret < min) || ((max != -1) && (ret > max))) {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            /* XML_SCHEMAP_INVALID_MINOCCURS, */
            NULL, (xmlNodePtr) attr, NULL, expected,
            val, NULL, NULL, NULL);
        return (def);
    }
    return (ret);
}

/**
 * xmlGetMinOccurs:
 * @ctxt:  a schema validation context
 * @node:  a subtree containing XML Schema informations
 *
 * Get the minOccurs property
 *
 * Returns the default if not found, or the value
 */
static int
xmlGetMinOccurs(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node,
                int min, int max, int def, const char *expected)
{
    const xmlChar *val, *cur;
    int ret = 0;
    xmlAttrPtr attr;

    attr = xmlSchemaGetPropNode(node, "minOccurs");
    if (attr == NULL)
        return (def);
    val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
    cur = val;
    while (IS_BLANK_CH(*cur))
        cur++;
    if (*cur == 0) {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            /* XML_SCHEMAP_INVALID_MINOCCURS, */
            NULL, (xmlNodePtr) attr, NULL, expected,
            val, NULL, NULL, NULL);
        return (def);
    }
    while ((*cur >= '0') && (*cur <= '9')) {
        ret = ret * 10 + (*cur - '0');
        cur++;
    }
    while (IS_BLANK_CH(*cur))
        cur++;
    /*
    * TODO: Restrict the maximal value to Integer.
    */
    if ((*cur != 0) || (ret < min) || ((max != -1) && (ret > max))) {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            /* XML_SCHEMAP_INVALID_MINOCCURS, */
            NULL, (xmlNodePtr) attr, NULL, expected,
            val, NULL, NULL, NULL);
        return (def);
    }
    return (ret);
}

/**
 * xmlSchemaPGetBoolNodeValue:
 * @ctxt:  a schema validation context
 * @ownerDes:  owner designation
 * @ownerItem:  the owner as a schema item
 * @node: the node holding the value
 *
 * Converts a boolean string value into 1 or 0.
 *
 * Returns 0 or 1.
 */
static int
xmlSchemaPGetBoolNodeValue(xmlSchemaParserCtxtPtr ctxt,
                           xmlSchemaBasicItemPtr ownerItem,
                           xmlNodePtr node)
{
    xmlChar *value = NULL;
    int res = 0;

    value = xmlNodeGetContent(node);
    /*
    * 3.2.2.1 Lexical representation
    * An instance of a datatype that is defined as ·boolean·
    * can have the following legal literals {true, false, 1, 0}.
    */
    if (xmlStrEqual(BAD_CAST value, BAD_CAST "true"))
        res = 1;
    else if (xmlStrEqual(BAD_CAST value, BAD_CAST "false"))
        res = 0;
    else if (xmlStrEqual(BAD_CAST value, BAD_CAST "1"))
        res = 1;
    else if (xmlStrEqual(BAD_CAST value, BAD_CAST "0"))
        res = 0;
    else {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_INVALID_BOOLEAN,
            ownerItem, node,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_BOOLEAN),
            NULL, BAD_CAST value,
            NULL, NULL, NULL);
    }
    if (value != NULL)
        xmlFree(value);
    return (res);
}

/**
 * xmlGetBooleanProp:
 * @ctxt:  a schema validation context
 * @node:  a subtree containing XML Schema informations
 * @name:  the attribute name
 * @def:  the default value
 *
 * Evaluate if a boolean property is set
 *
 * Returns the default if not found, 0 if found to be false,
 * 1 if found to be true
 */
static int
xmlGetBooleanProp(xmlSchemaParserCtxtPtr ctxt,
                  xmlNodePtr node,
                  const char *name, int def)
{
    const xmlChar *val;

    val = xmlSchemaGetProp(ctxt, node, name);
    if (val == NULL)
        return (def);
    /*
    * 3.2.2.1 Lexical representation
    * An instance of a datatype that is defined as ·boolean·
    * can have the following legal literals {true, false, 1, 0}.
    */
    if (xmlStrEqual(val, BAD_CAST "true"))
        def = 1;
    else if (xmlStrEqual(val, BAD_CAST "false"))
        def = 0;
    else if (xmlStrEqual(val, BAD_CAST "1"))
        def = 1;
    else if (xmlStrEqual(val, BAD_CAST "0"))
        def = 0;
    else {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_INVALID_BOOLEAN,
            NULL,
            (xmlNodePtr) xmlSchemaGetPropNode(node, name),
            xmlSchemaGetBuiltInType(XML_SCHEMAS_BOOLEAN),
            NULL, val, NULL, NULL, NULL);
    }
    return (def);
}

/************************************************************************
 *                                                                      *
 *              Shema extraction from an Infoset                        *
 *                                                                      *
 ************************************************************************/
static xmlSchemaTypePtr xmlSchemaParseSimpleType(xmlSchemaParserCtxtPtr
                                                 ctxt, xmlSchemaPtr schema,
                                                 xmlNodePtr node,
                                                 int topLevel);
static xmlSchemaTypePtr xmlSchemaParseComplexType(xmlSchemaParserCtxtPtr
                                                  ctxt,
                                                  xmlSchemaPtr schema,
                                                  xmlNodePtr node,
                                                  int topLevel);
static xmlSchemaTypePtr xmlSchemaParseRestriction(xmlSchemaParserCtxtPtr
                                                  ctxt,
                                                  xmlSchemaPtr schema,
                                                  xmlNodePtr node,
                                                  xmlSchemaTypeType parentType);
static xmlSchemaBasicItemPtr
xmlSchemaParseLocalAttribute(xmlSchemaParserCtxtPtr pctxt,
                             xmlSchemaPtr schema,
                             xmlNodePtr node,
                             xmlSchemaItemListPtr uses,
                             int parentType);
static xmlSchemaTypePtr xmlSchemaParseList(xmlSchemaParserCtxtPtr ctxt,
                                           xmlSchemaPtr schema,
                                           xmlNodePtr node);
static xmlSchemaWildcardPtr
xmlSchemaParseAnyAttribute(xmlSchemaParserCtxtPtr ctxt,
                           xmlSchemaPtr schema, xmlNodePtr node);

/**
 * xmlSchemaPValAttrNodeValue:
 *
 * @ctxt:  a schema parser context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the schema object owner if existent
 * @attr:  the schema attribute node being validated
 * @value: the value
 * @type: the built-in type to be validated against
 *
 * Validates a value against the given built-in type.
 * This one is intended to be used internally for validation
 * of schema attribute values during parsing of the schema.
 *
 * Returns 0 if the value is valid, a positive error code
 * number otherwise and -1 in case of an internal or API error.
 */
static int
xmlSchemaPValAttrNodeValue(xmlSchemaParserCtxtPtr pctxt,
                           xmlSchemaBasicItemPtr ownerItem,
                           xmlAttrPtr attr,
                           const xmlChar *value,
                           xmlSchemaTypePtr type)
{

    int ret = 0;

    /*
    * NOTE: Should we move this to xmlschematypes.c? Hmm, but this
    * one is really meant to be used internally, so better not.
    */
    if ((pctxt == NULL) || (type == NULL) || (attr == NULL))
        return (-1);
    if (type->type != XML_SCHEMA_TYPE_BASIC) {
        PERROR_INT("xmlSchemaPValAttrNodeValue",
            "the given type is not a built-in type");
        return (-1);
    }
    switch (type->builtInType) {
        case XML_SCHEMAS_NCNAME:
        case XML_SCHEMAS_QNAME:
        case XML_SCHEMAS_ANYURI:
        case XML_SCHEMAS_TOKEN:
        case XML_SCHEMAS_LANGUAGE:
            ret = xmlSchemaValPredefTypeNode(type, value, NULL,
                (xmlNodePtr) attr);
            break;
        default: {
            PERROR_INT("xmlSchemaPValAttrNodeValue",
                "validation using the given type is not supported while "
                "parsing a schema");
            return (-1);
        }
    }
    /*
    * TODO: Should we use the S4S error codes instead?
    */
    if (ret < 0) {
        PERROR_INT("xmlSchemaPValAttrNodeValue",
            "failed to validate a schema attribute value");
        return (-1);
    } else if (ret > 0) {
        if (WXS_IS_LIST(type))
            ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_2;
        else
            ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_1;
        xmlSchemaPSimpleTypeErr(pctxt, 
            ret, ownerItem, (xmlNodePtr) attr,
            type, NULL, value, NULL, NULL, NULL);
    }
    return (ret);
}

/**
 * xmlSchemaPValAttrNode:
 *
 * @ctxt:  a schema parser context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the schema object owner if existent
 * @attr:  the schema attribute node being validated
 * @type: the built-in type to be validated against
 * @value: the resulting value if any
 *
 * Extracts and validates a value against the given built-in type.
 * This one is intended to be used internally for validation
 * of schema attribute values during parsing of the schema.
 *
 * Returns 0 if the value is valid, a positive error code
 * number otherwise and -1 in case of an internal or API error.
 */
static int
xmlSchemaPValAttrNode(xmlSchemaParserCtxtPtr ctxt,
                           xmlSchemaBasicItemPtr ownerItem,
                           xmlAttrPtr attr,
                           xmlSchemaTypePtr type,
                           const xmlChar **value)
{
    const xmlChar *val;

    if ((ctxt == NULL) || (type == NULL) || (attr == NULL))
        return (-1);

    val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
    if (value != NULL)
        *value = val;

    return (xmlSchemaPValAttrNodeValue(ctxt, ownerItem, attr,
        val, type));
}

/**
 * xmlSchemaPValAttr:
 *
 * @ctxt:  a schema parser context
 * @node: the element node of the attribute
 * @ownerDes: the designation of the parent element
 * @ownerItem: the schema object owner if existent
 * @ownerElem: the owner element node
 * @name:  the name of the schema attribute node
 * @type: the built-in type to be validated against
 * @value: the resulting value if any
 *
 * Extracts and validates a value against the given built-in type.
 * This one is intended to be used internally for validation
 * of schema attribute values during parsing of the schema.
 *
 * Returns 0 if the value is valid, a positive error code
 * number otherwise and -1 in case of an internal or API error.
 */
static int
xmlSchemaPValAttr(xmlSchemaParserCtxtPtr ctxt,                 
                       xmlSchemaBasicItemPtr ownerItem,
                       xmlNodePtr ownerElem,
                       const char *name,
                       xmlSchemaTypePtr type,
                       const xmlChar **value)
{
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (type == NULL)) {
        if (value != NULL)
            *value = NULL;
        return (-1);
    }
    if (type->type != XML_SCHEMA_TYPE_BASIC) {
        if (value != NULL)
            *value = NULL;
        xmlSchemaPErr(ctxt, ownerElem,
            XML_SCHEMAP_INTERNAL,
            "Internal error: xmlSchemaPValAttr, the given "
            "type '%s' is not a built-in type.\n",
            type->name, NULL);
        return (-1);
    }
    attr = xmlSchemaGetPropNode(ownerElem, name);
    if (attr == NULL) {
        if (value != NULL)
            *value = NULL;
        return (0);
    }
    return (xmlSchemaPValAttrNode(ctxt, ownerItem, attr,
        type, value));
}

static int
xmlSchemaCheckReference(xmlSchemaParserCtxtPtr pctxt,
                  xmlSchemaPtr schema ATTRIBUTE_UNUSED,
                  xmlNodePtr node,
                  xmlAttrPtr attr,
                  const xmlChar *namespaceName)
{
    /* TODO: Pointer comparison instead? */
    if (xmlStrEqual(pctxt->targetNamespace, namespaceName))
        return (0);
    if (xmlStrEqual(xmlSchemaNs, namespaceName))
        return (0);
    /*
    * Check if the referenced namespace was <import>ed.
    */
    if (WXS_BUCKET(pctxt)->relations != NULL) {
        xmlSchemaSchemaRelationPtr rel;

        rel = WXS_BUCKET(pctxt)->relations;
        do {
            if (WXS_IS_BUCKET_IMPMAIN(rel->type) &&
                xmlStrEqual(namespaceName, rel->importNamespace))
                return (0);
            rel = rel->next;
        } while (rel != NULL);
    }
    /*
    * No matching <import>ed namespace found.
    */
    {
        xmlNodePtr n = (attr != NULL) ? (xmlNodePtr) attr : node;

        if (namespaceName == NULL)
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                XML_SCHEMAP_SRC_RESOLVE, n, NULL,
                "References from this schema to components in no "
                "namespace are not allowed, since not indicated by an "
                "import statement", NULL, NULL);
        else
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                XML_SCHEMAP_SRC_RESOLVE, n, NULL,
                "References from this schema to components in the "
                "namespace '%s' are not allowed, since not indicated by an "
                "import statement", namespaceName, NULL);
    }
    return (XML_SCHEMAP_SRC_RESOLVE);
}

/**
 * xmlSchemaParseLocalAttributes:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 * @type:  the hosting type where the attributes will be anchored
 *
 * Parses attribute uses and attribute declarations and
 * attribute group references. 
 */
static int
xmlSchemaParseLocalAttributes(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                        xmlNodePtr *child, xmlSchemaItemListPtr *list,
                        int parentType, int *hasRefs)
{
    void *item;

    while ((IS_SCHEMA((*child), "attribute")) ||
           (IS_SCHEMA((*child), "attributeGroup"))) {
        if (IS_SCHEMA((*child), "attribute")) {
            item = xmlSchemaParseLocalAttribute(ctxt, schema, *child,
                *list, parentType);
        } else {
            item = xmlSchemaParseAttributeGroupRef(ctxt, schema, *child);
            if ((item != NULL) && (hasRefs != NULL))
                *hasRefs = 1;
        }
        if (item != NULL) {
            if (*list == NULL) {
                /* TODO: Customize grow factor. */
                *list = xmlSchemaItemListCreate();
                if (*list == NULL)
                    return(-1);
            }
            if (xmlSchemaItemListAddSize(*list, 2, item) == -1)
                return(-1);
        }
        *child = (*child)->next;
    }
    return (0);
}

/**
 * xmlSchemaParseAnnotation:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Attrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 *         1 in case of success.
 */
static xmlSchemaAnnotPtr
xmlSchemaParseAnnotation(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node, int needed)
{
    xmlSchemaAnnotPtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    int barked = 0;

    /*
    * INFO: S4S completed.
    */
    /*
    * id = ID
    * {any attributes with non-schema namespace . . .}>
    * Content: (appinfo | documentation)*
    */
    if ((ctxt == NULL) || (node == NULL))
        return (NULL);
    if (needed)
        ret = xmlSchemaNewAnnot(ctxt, node);
    else
        ret = NULL;
    attr = node->properties;
    while (attr != NULL) {
        if (((attr->ns == NULL) &&
            (!xmlStrEqual(attr->name, BAD_CAST "id"))) ||
            ((attr->ns != NULL) &&
            xmlStrEqual(attr->ns->href, xmlSchemaNs))) {

            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    while (child != NULL) {
        if (IS_SCHEMA(child, "appinfo")) {
            /* TODO: make available the content of "appinfo". */
            /*
            * source = anyURI
            * {any attributes with non-schema namespace . . .}>
            * Content: ({any})*
            */
            attr = child->properties;
            while (attr != NULL) {
                if (((attr->ns == NULL) &&
                     (!xmlStrEqual(attr->name, BAD_CAST "source"))) ||
                     ((attr->ns != NULL) &&
                      xmlStrEqual(attr->ns->href, xmlSchemaNs))) {

                    xmlSchemaPIllegalAttrErr(ctxt,
                        XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                }
                attr = attr->next;
            }
            xmlSchemaPValAttr(ctxt, NULL, child, "source",
                xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI), NULL);
            child = child->next;
        } else if (IS_SCHEMA(child, "documentation")) {
            /* TODO: make available the content of "documentation". */
            /*
            * source = anyURI
            * {any attributes with non-schema namespace . . .}>
            * Content: ({any})*
            */
            attr = child->properties;
            while (attr != NULL) {
                if (attr->ns == NULL) {
                    if (!xmlStrEqual(attr->name, BAD_CAST "source")) {
                        xmlSchemaPIllegalAttrErr(ctxt,
                            XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                    }
                } else {
                    if (xmlStrEqual(attr->ns->href, xmlSchemaNs) ||
                        (xmlStrEqual(attr->name, BAD_CAST "lang") &&
                        (!xmlStrEqual(attr->ns->href, XML_XML_NAMESPACE)))) {

                        xmlSchemaPIllegalAttrErr(ctxt,
                            XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                    }
                }
                attr = attr->next;
            }
            /*
            * Attribute "xml:lang".
            */
            attr = xmlSchemaGetPropNodeNs(child, (const char *) XML_XML_NAMESPACE, "lang");
            if (attr != NULL)
                xmlSchemaPValAttrNode(ctxt, NULL, attr,
                xmlSchemaGetBuiltInType(XML_SCHEMAS_LANGUAGE), NULL);
            child = child->next;
        } else {
            if (!barked)
                xmlSchemaPContentErr(ctxt,
                    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                    NULL, node, child, NULL, "(appinfo | documentation)*");
            barked = 1;
            child = child->next;
        }
    }

    return (ret);
}

/**
 * xmlSchemaParseFacet:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Facet declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new type structure or NULL in case of error
 */
static xmlSchemaFacetPtr
xmlSchemaParseFacet(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                    xmlNodePtr node)
{
    xmlSchemaFacetPtr facet;
    xmlNodePtr child = NULL;
    const xmlChar *value;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    facet = xmlSchemaNewFacet();
    if (facet == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating facet", node);
        return (NULL);
    }
    facet->node = node;
    value = xmlSchemaGetProp(ctxt, node, "value");
    if (value == NULL) {
        xmlSchemaPErr2(ctxt, node, child, XML_SCHEMAP_FACET_NO_VALUE,
                       "Facet %s has no value\n", node->name, NULL);
        xmlSchemaFreeFacet(facet);
        return (NULL);
    }
    if (IS_SCHEMA(node, "minInclusive")) {
        facet->type = XML_SCHEMA_FACET_MININCLUSIVE;
    } else if (IS_SCHEMA(node, "minExclusive")) {
        facet->type = XML_SCHEMA_FACET_MINEXCLUSIVE;
    } else if (IS_SCHEMA(node, "maxInclusive")) {
        facet->type = XML_SCHEMA_FACET_MAXINCLUSIVE;
    } else if (IS_SCHEMA(node, "maxExclusive")) {
        facet->type = XML_SCHEMA_FACET_MAXEXCLUSIVE;
    } else if (IS_SCHEMA(node, "totalDigits")) {
        facet->type = XML_SCHEMA_FACET_TOTALDIGITS;
    } else if (IS_SCHEMA(node, "fractionDigits")) {
        facet->type = XML_SCHEMA_FACET_FRACTIONDIGITS;
    } else if (IS_SCHEMA(node, "pattern")) {
        facet->type = XML_SCHEMA_FACET_PATTERN;
    } else if (IS_SCHEMA(node, "enumeration")) {
        facet->type = XML_SCHEMA_FACET_ENUMERATION;
    } else if (IS_SCHEMA(node, "whiteSpace")) {
        facet->type = XML_SCHEMA_FACET_WHITESPACE;
    } else if (IS_SCHEMA(node, "length")) {
        facet->type = XML_SCHEMA_FACET_LENGTH;
    } else if (IS_SCHEMA(node, "maxLength")) {
        facet->type = XML_SCHEMA_FACET_MAXLENGTH;
    } else if (IS_SCHEMA(node, "minLength")) {
        facet->type = XML_SCHEMA_FACET_MINLENGTH;
    } else {
        xmlSchemaPErr2(ctxt, node, child, XML_SCHEMAP_UNKNOWN_FACET_TYPE,
                       "Unknown facet type %s\n", node->name, NULL);
        xmlSchemaFreeFacet(facet);
        return (NULL);
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    facet->value = value;
    if ((facet->type != XML_SCHEMA_FACET_PATTERN) &&
        (facet->type != XML_SCHEMA_FACET_ENUMERATION)) {
        const xmlChar *fixed;

        fixed = xmlSchemaGetProp(ctxt, node, "fixed");
        if (fixed != NULL) {
            if (xmlStrEqual(fixed, BAD_CAST "true"))
                facet->fixed = 1;
        }
    }
    child = node->children;

    if (IS_SCHEMA(child, "annotation")) {
        facet->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPErr2(ctxt, node, child, XML_SCHEMAP_UNKNOWN_FACET_CHILD,
                       "Facet %s has unexpected child content\n",
                       node->name, NULL);
    }
    return (facet);
}

/**
 * xmlSchemaParseWildcardNs:
 * @ctxt:  a schema parser context
 * @wildc:  the wildcard, already created
 * @node:  a subtree containing XML Schema informations
 *
 * Parses the attribute "processContents" and "namespace"
 * of a xsd:anyAttribute and xsd:any.
 * *WARNING* this interface is highly subject to change
 *
 * Returns 0 if everything goes fine, a positive error code
 * if something is not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaParseWildcardNs(xmlSchemaParserCtxtPtr ctxt,
                         xmlSchemaPtr schema ATTRIBUTE_UNUSED,
                         xmlSchemaWildcardPtr wildc,
                         xmlNodePtr node)
{
    const xmlChar *pc, *ns, *dictnsItem;
    int ret = 0;
    xmlChar *nsItem;
    xmlSchemaWildcardNsPtr tmp, lastNs = NULL;
    xmlAttrPtr attr;

    pc = xmlSchemaGetProp(ctxt, node, "processContents");
    if ((pc == NULL)
        || (xmlStrEqual(pc, (const xmlChar *) "strict"))) {
        wildc->processContents = XML_SCHEMAS_ANY_STRICT;
    } else if (xmlStrEqual(pc, (const xmlChar *) "skip")) {
        wildc->processContents = XML_SCHEMAS_ANY_SKIP;
    } else if (xmlStrEqual(pc, (const xmlChar *) "lax")) {
        wildc->processContents = XML_SCHEMAS_ANY_LAX;
    } else {
        xmlSchemaPSimpleTypeErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            NULL, node,
            NULL, "(strict | skip | lax)", pc,
            NULL, NULL, NULL);
        wildc->processContents = XML_SCHEMAS_ANY_STRICT;
        ret = XML_SCHEMAP_S4S_ATTR_INVALID_VALUE;
    }
    /*
     * Build the namespace constraints.
     */
    attr = xmlSchemaGetPropNode(node, "namespace");
    ns = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
    if ((attr == NULL) || (xmlStrEqual(ns, BAD_CAST "##any")))
        wildc->any = 1;
    else if (xmlStrEqual(ns, BAD_CAST "##other")) {
        wildc->negNsSet = xmlSchemaNewWildcardNsConstraint(ctxt);
        if (wildc->negNsSet == NULL) {
            return (-1);
        }
        wildc->negNsSet->value = ctxt->targetNamespace;
    } else {
        const xmlChar *end, *cur;

        cur = ns;
        do {
            while (IS_BLANK_CH(*cur))
                cur++;
            end = cur;
            while ((*end != 0) && (!(IS_BLANK_CH(*end))))
                end++;
            if (end == cur)
                break;
            nsItem = xmlStrndup(cur, end - cur);
            if ((xmlStrEqual(nsItem, BAD_CAST "##other")) ||
                    (xmlStrEqual(nsItem, BAD_CAST "##any"))) {
                xmlSchemaPSimpleTypeErr(ctxt,
                    XML_SCHEMAP_WILDCARD_INVALID_NS_MEMBER,
                    NULL, (xmlNodePtr) attr,
                    NULL,
                    "((##any | ##other) | List of (xs:anyURI | "
                    "(##targetNamespace | ##local)))",
                    nsItem, NULL, NULL, NULL);
                ret = XML_SCHEMAP_WILDCARD_INVALID_NS_MEMBER;
            } else {
                if (xmlStrEqual(nsItem, BAD_CAST "##targetNamespace")) {
                    dictnsItem = ctxt->targetNamespace;
                } else if (xmlStrEqual(nsItem, BAD_CAST "##local")) {
                    dictnsItem = NULL;
                } else {
                    /*
                    * Validate the item (anyURI).
                    */
                    xmlSchemaPValAttrNodeValue(ctxt, NULL, attr,
                        nsItem, xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI));
                    dictnsItem = xmlDictLookup(ctxt->dict, nsItem, -1);
                }
                /*
                * Avoid dublicate namespaces.
                */
                tmp = wildc->nsSet;
                while (tmp != NULL) {
                    if (dictnsItem == tmp->value)
                        break;
                    tmp = tmp->next;
                }
                if (tmp == NULL) {
                    tmp = xmlSchemaNewWildcardNsConstraint(ctxt);
                    if (tmp == NULL) {
                        xmlFree(nsItem);
                        return (-1);
                    }
                    tmp->value = dictnsItem;
                    tmp->next = NULL;
                    if (wildc->nsSet == NULL)
                        wildc->nsSet = tmp;
                    else
                        lastNs->next = tmp;
                    lastNs = tmp;
                }

            }
            xmlFree(nsItem);
            cur = end;
        } while (*cur != 0);
    }
    return (ret);
}

static int
xmlSchemaPCheckParticleCorrect_2(xmlSchemaParserCtxtPtr ctxt,
                                 xmlSchemaParticlePtr item ATTRIBUTE_UNUSED,
                                 xmlNodePtr node,
                                 int minOccurs,
                                 int maxOccurs) {

    if ((maxOccurs == 0) && ( minOccurs == 0))
        return (0);
    if (maxOccurs != UNBOUNDED) {
        /*
        * TODO: Maybe we should better not create the particle,
        * if min/max is invalid, since it could confuse the build of the
        * content model.
        */
        /*
        * 3.9.6 Schema Component Constraint: Particle Correct
        *
        */
        if (maxOccurs < 1) {
            /*
            * 2.2 {max occurs} must be greater than or equal to 1.
            */
            xmlSchemaPCustomAttrErr(ctxt,
                XML_SCHEMAP_P_PROPS_CORRECT_2_2,
                NULL, NULL,
                xmlSchemaGetPropNode(node, "maxOccurs"),
                "The value must be greater than or equal to 1");
            return (XML_SCHEMAP_P_PROPS_CORRECT_2_2);
        } else if (minOccurs > maxOccurs) {
            /*
            * 2.1 {min occurs} must not be greater than {max occurs}.
            */
            xmlSchemaPCustomAttrErr(ctxt,
                XML_SCHEMAP_P_PROPS_CORRECT_2_1,
                NULL, NULL,
                xmlSchemaGetPropNode(node, "minOccurs"),
                "The value must not be greater than the value of 'maxOccurs'");
            return (XML_SCHEMAP_P_PROPS_CORRECT_2_1);
        }
    }
    return (0);
}

/**
 * xmlSchemaParseAny:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parsea a XML schema <any> element. A particle and wildcard
 * will be created (except if minOccurs==maxOccurs==0, in this case
 * nothing will be created).
 * *WARNING* this interface is highly subject to change
 *
 * Returns the particle or NULL in case of error or if minOccurs==maxOccurs==0
 */
static xmlSchemaParticlePtr
xmlSchemaParseAny(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                  xmlNodePtr node)
{
    xmlSchemaParticlePtr particle;
    xmlNodePtr child = NULL;
    xmlSchemaWildcardPtr wild;
    int min, max;
    xmlAttrPtr attr;
    xmlSchemaAnnotPtr annot = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "minOccurs")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "maxOccurs")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "namespace")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "processContents"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * minOccurs/maxOccurs.
    */
    max = xmlGetMaxOccurs(ctxt, node, 0, UNBOUNDED, 1,
        "(xs:nonNegativeInteger | unbounded)");
    min = xmlGetMinOccurs(ctxt, node, 0, -1, 1,
        "xs:nonNegativeInteger");
    xmlSchemaPCheckParticleCorrect_2(ctxt, NULL, node, min, max);
    /*
    * Create & parse the wildcard.
    */
    wild = xmlSchemaAddWildcard(ctxt, schema, XML_SCHEMA_TYPE_ANY, node);
    if (wild == NULL)
        return (NULL);
    xmlSchemaParseWildcardNs(ctxt, schema, wild, node);
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child,
            NULL, "(annotation?)");
    }
    /*
    * No component if minOccurs==maxOccurs==0.
    */
    if ((min == 0) && (max == 0)) {
        /* Don't free the wildcard, since it's already on the list. */
        return (NULL);
    }
    /*
    * Create the particle.
    */
    particle = xmlSchemaAddParticle(ctxt, node, min, max);
    if (particle == NULL)
        return (NULL);
    particle->annot = annot;
    particle->children = (xmlSchemaTreeItemPtr) wild;

    return (particle);
}

/**
 * xmlSchemaParseNotation:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Notation declaration
 *
 * Returns the new structure or NULL in case of error
 */
static xmlSchemaNotationPtr
xmlSchemaParseNotation(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                       xmlNodePtr node)
{
    const xmlChar *name;
    xmlSchemaNotationPtr ret;
    xmlNodePtr child = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    name = xmlSchemaGetProp(ctxt, node, "name");
    if (name == NULL) {
        xmlSchemaPErr2(ctxt, node, child, XML_SCHEMAP_NOTATION_NO_NAME,
                       "Notation has no name\n", NULL, NULL);
        return (NULL);
    }
    ret = xmlSchemaAddNotation(ctxt, schema, name,
        ctxt->targetNamespace, node);
    if (ret == NULL)
        return (NULL);
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");

    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        ret->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child,
            NULL, "(annotation?)");
    }

    return (ret);
}

/**
 * xmlSchemaParseAnyAttribute:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema AnyAttrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns a wildcard or NULL.
 */
static xmlSchemaWildcardPtr
xmlSchemaParseAnyAttribute(xmlSchemaParserCtxtPtr ctxt,
                           xmlSchemaPtr schema, xmlNodePtr node)
{
    xmlSchemaWildcardPtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    ret = xmlSchemaAddWildcard(ctxt, schema, XML_SCHEMA_TYPE_ANY_ATTRIBUTE,
        node);
    if (ret == NULL) {
        return (NULL);
    }
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "namespace")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "processContents"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * Parse the namespace list.
    */
    if (xmlSchemaParseWildcardNs(ctxt, schema, ret, node) != 0)
        return (NULL);
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        ret->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child,
            NULL, "(annotation?)");
    }

    return (ret);
}


/**
 * xmlSchemaParseAttribute:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Attrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the attribute declaration.
 */
static xmlSchemaBasicItemPtr
xmlSchemaParseLocalAttribute(xmlSchemaParserCtxtPtr pctxt,
                             xmlSchemaPtr schema,
                             xmlNodePtr node,
                             xmlSchemaItemListPtr uses,
                             int parentType)
{
    const xmlChar *attrValue, *name = NULL, *ns = NULL;
    xmlSchemaAttributeUsePtr use = NULL;    
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *tmpNs = NULL, *tmpName = NULL, *defValue = NULL;
    int isRef = 0, occurs = XML_SCHEMAS_ATTR_USE_OPTIONAL;
    int nberrors, hasForm = 0, defValueType = 0;

#define WXS_ATTR_DEF_VAL_DEFAULT 1
#define WXS_ATTR_DEF_VAL_FIXED 2

    /*
     * 3.2.3 Constraints on XML Representations of Attribute Declarations
     */

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    attr = xmlSchemaGetPropNode(node, "ref");
    if (attr != NULL) {
        if (xmlSchemaPValAttrNodeQName(pctxt, schema,
            NULL, attr, &tmpNs, &tmpName) != 0) {
            return (NULL);
        }
        if (xmlSchemaCheckReference(pctxt, schema, node, attr, tmpNs) != 0)
            return(NULL);
        isRef = 1;
    }
    nberrors = pctxt->nberrors;
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if (isRef) {
                if (xmlStrEqual(attr->name, BAD_CAST "id")) {
                    xmlSchemaPValAttrNodeID(pctxt, attr);
                    goto attr_next;
                } else if (xmlStrEqual(attr->name, BAD_CAST "ref")) {
                    goto attr_next;
                }
            } else {
                if (xmlStrEqual(attr->name, BAD_CAST "name")) {
                    goto attr_next;
                } else if (xmlStrEqual(attr->name, BAD_CAST "id")) {
                    xmlSchemaPValAttrNodeID(pctxt, attr);
                    goto attr_next;
                } else if (xmlStrEqual(attr->name, BAD_CAST "type")) {
                    xmlSchemaPValAttrNodeQName(pctxt, schema, NULL,
                        attr, &tmpNs, &tmpName);
                    goto attr_next;
                } else if (xmlStrEqual(attr->name, BAD_CAST "form")) {
                    /*
                    * Evaluate the target namespace
                    */
                    hasForm = 1;                    
                    attrValue = xmlSchemaGetNodeContent(pctxt,
                        (xmlNodePtr) attr);
                    if (xmlStrEqual(attrValue, BAD_CAST "qualified")) {
                        ns = pctxt->targetNamespace;
                    } else if (!xmlStrEqual(attrValue, BAD_CAST "unqualified"))
                    {
                        xmlSchemaPSimpleTypeErr(pctxt,
                            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                            NULL, (xmlNodePtr) attr,
                            NULL, "(qualified | unqualified)",
                            attrValue, NULL, NULL, NULL);
                    }
                    goto attr_next;
                }
            }
            if (xmlStrEqual(attr->name, BAD_CAST "use")) {

                attrValue = xmlSchemaGetNodeContent(pctxt, (xmlNodePtr) attr);
                /* TODO: Maybe we need to normalize the value beforehand. */
                if (xmlStrEqual(attrValue, BAD_CAST "optional"))
                    occurs = XML_SCHEMAS_ATTR_USE_OPTIONAL;
                else if (xmlStrEqual(attrValue, BAD_CAST "prohibited"))
                    occurs = XML_SCHEMAS_ATTR_USE_PROHIBITED;
                else if (xmlStrEqual(attrValue, BAD_CAST "required"))
                    occurs = XML_SCHEMAS_ATTR_USE_REQUIRED;
                else {
                    xmlSchemaPSimpleTypeErr(pctxt,
                        XML_SCHEMAP_INVALID_ATTR_USE,
                        NULL, (xmlNodePtr) attr,
                        NULL, "(optional | prohibited | required)",
                        attrValue, NULL, NULL, NULL);
                }
                goto attr_next;
            } else if (xmlStrEqual(attr->name, BAD_CAST "default")) {
                /*
                * 3.2.3 : 1
                * default and fixed must not both be present.
                */
                if (defValue) {
                    xmlSchemaPMutualExclAttrErr(pctxt,
                        XML_SCHEMAP_SRC_ATTRIBUTE_1,
                        NULL, attr, "default", "fixed");
                } else {
                    defValue = xmlSchemaGetNodeContent(pctxt, (xmlNodePtr) attr);
                    defValueType = WXS_ATTR_DEF_VAL_DEFAULT;
                }
                goto attr_next;
            } else if (xmlStrEqual(attr->name, BAD_CAST "fixed")) {
                /*
                * 3.2.3 : 1
                * default and fixed must not both be present.
                */
                if (defValue) {
                    xmlSchemaPMutualExclAttrErr(pctxt,
                        XML_SCHEMAP_SRC_ATTRIBUTE_1,
                        NULL, attr, "default", "fixed");
                } else {
                    defValue = xmlSchemaGetNodeContent(pctxt, (xmlNodePtr) attr);
                    defValueType = WXS_ATTR_DEF_VAL_FIXED;
                }
                goto attr_next;
            }
        } else if (! xmlStrEqual(attr->ns->href, xmlSchemaNs))
            goto attr_next;

        xmlSchemaPIllegalAttrErr(pctxt,
            XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);

attr_next:
        attr = attr->next;
    }        
    /*
    * 3.2.3 : 2
    * If default and use are both present, use must have
    * the actual value optional.
    */
    if ((defValueType == WXS_ATTR_DEF_VAL_DEFAULT) &&
        (occurs != XML_SCHEMAS_ATTR_USE_OPTIONAL)) {
        xmlSchemaPSimpleTypeErr(pctxt,
            XML_SCHEMAP_SRC_ATTRIBUTE_2,
            NULL, node, NULL,
            "(optional | prohibited | required)", NULL,
            "The value of the attribute 'use' must be 'optional' "
            "if the attribute 'default' is present",
            NULL, NULL);
    }
    /*
    * We want correct attributes.
    */
    if (nberrors != pctxt->nberrors)
        return(NULL);
    if (! isRef) {
        xmlSchemaAttributePtr attrDecl;

        /* TODO: move XML_SCHEMAS_QUALIF_ATTR to the parser. */
        if ((! hasForm) && (schema->flags & XML_SCHEMAS_QUALIF_ATTR))
            ns = pctxt->targetNamespace;                
        /*
        * 3.2.6 Schema Component Constraint: xsi: Not Allowed
        * TODO: Move this to the component layer.
        */
        if (xmlStrEqual(ns, xmlSchemaInstanceNs)) {
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                XML_SCHEMAP_NO_XSI,
                node, NULL,
                "The target namespace must not match '%s'",
                xmlSchemaInstanceNs, NULL);
        }
        attr = xmlSchemaGetPropNode(node, "name");
        if (attr == NULL) {
            xmlSchemaPMissingAttrErr(pctxt, XML_SCHEMAP_S4S_ATTR_MISSING,
                NULL, node, "name", NULL);
            return (NULL);
        }
        if (xmlSchemaPValAttrNode(pctxt, NULL, attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
            return (NULL);
        }
        /*
        * 3.2.6 Schema Component Constraint: xmlns Not Allowed
        * TODO: Move this to the component layer.
        */
        if (xmlStrEqual(name, BAD_CAST "xmlns")) {
            xmlSchemaPSimpleTypeErr(pctxt,
                XML_SCHEMAP_NO_XMLNS,
                NULL, (xmlNodePtr) attr,
                xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), NULL, NULL,
                "The value of the attribute must not match 'xmlns'",
                NULL, NULL);
            return (NULL);
        }
        if (occurs == XML_SCHEMAS_ATTR_USE_PROHIBITED)
            goto check_children;
        /*
        * Create the attribute use component.
        */
        use = xmlSchemaAddAttributeUse(pctxt, node);
        if (use == NULL)
            return(NULL);
        use->occurs = occurs;
        /*
        * Create the attribute declaration.
        */
        attrDecl = xmlSchemaAddAttribute(pctxt, schema, name, ns, node, 0);
        if (attrDecl == NULL)
            return (NULL);
        if (tmpName != NULL) {
            attrDecl->typeName = tmpName;
            attrDecl->typeNs = tmpNs;
        }
        use->attrDecl = attrDecl;
        /*
        * Value constraint.
        */      
        if (defValue != NULL) {
            attrDecl->defValue = defValue;
            if (defValueType == WXS_ATTR_DEF_VAL_FIXED)
                attrDecl->flags |= XML_SCHEMAS_ATTR_FIXED;
        }
    } else if (occurs != XML_SCHEMAS_ATTR_USE_PROHIBITED) {
        xmlSchemaQNameRefPtr ref;

        /*
        * Create the attribute use component.
        */
        use = xmlSchemaAddAttributeUse(pctxt, node);
        if (use == NULL)
            return(NULL);
        /*
        * We need to resolve the reference at later stage.
        */
        WXS_ADD_PENDING(pctxt, use);
        use->occurs = occurs;
        /*
        * Create a QName reference to the attribute declaration.
        */
        ref = xmlSchemaNewQNameRef(pctxt, XML_SCHEMA_TYPE_ATTRIBUTE,
            tmpName, tmpNs);
        if (ref == NULL)
            return(NULL);
        /*
        * Assign the reference. This will be substituted for the
        * referenced attribute declaration when the QName is resolved.
        */
        use->attrDecl = WXS_ATTR_CAST ref;
        /*
        * Value constraint.
        */
        if (defValue != NULL)
            use->defValue = defValue;
            if (defValueType == WXS_ATTR_DEF_VAL_FIXED)
                use->flags |= XML_SCHEMA_ATTR_USE_FIXED;
    }
    
check_children:
    /*
    * And now for the children...
    */
    child = node->children;
    if (occurs == XML_SCHEMAS_ATTR_USE_PROHIBITED) {
        xmlSchemaAttributeUseProhibPtr prohib;  

        if (IS_SCHEMA(child, "annotation")) {
            xmlSchemaParseAnnotation(pctxt, child, 0);
            child = child->next;
        }
        if (child != NULL) {
            xmlSchemaPContentErr(pctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "(annotation?)");
        }
        /*
        * Check for pointlessness of attribute prohibitions.
        */
        if (parentType == XML_SCHEMA_TYPE_ATTRIBUTEGROUP) {             
            xmlSchemaCustomWarning(ACTXT_CAST pctxt,
                XML_SCHEMAP_WARN_ATTR_POINTLESS_PROH,
                node, NULL,
                "Skipping attribute use prohibition, since it is "
                "pointless inside an <attributeGroup>",
                NULL, NULL, NULL);
            return(NULL);
        } else if (parentType == XML_SCHEMA_TYPE_EXTENSION) {
            xmlSchemaCustomWarning(ACTXT_CAST pctxt,
                XML_SCHEMAP_WARN_ATTR_POINTLESS_PROH,
                node, NULL,
                "Skipping attribute use prohibition, since it is "
                "pointless when extending a type",
                NULL, NULL, NULL);
            return(NULL);
        }
        if (! isRef) {
            tmpName = name; 
            tmpNs = ns;
        }
        /*
        * Check for duplicate attribute prohibitions.
        */
        if (uses) {
            int i;
            
            for (i = 0; i < uses->nbItems; i++) {
                use = uses->items[i];
                if ((use->type == XML_SCHEMA_EXTRA_ATTR_USE_PROHIB) &&
                    (tmpName == (WXS_ATTR_PROHIB_CAST use)->name) &&
                    (tmpNs == (WXS_ATTR_PROHIB_CAST use)->targetNamespace))
                {
                    xmlChar *str = NULL;
                    
                    xmlSchemaCustomWarning(ACTXT_CAST pctxt,
                        XML_SCHEMAP_WARN_ATTR_POINTLESS_PROH,
                        node, NULL,
                        "Skipping duplicate attribute use prohibition '%s'",
                        xmlSchemaFormatQName(&str, tmpNs, tmpName),
                        NULL, NULL);
                    FREE_AND_NULL(str)                  
                    return(NULL);
                }       
            }
        }
        /*
        * Create the attribute prohibition helper component.
        */
        prohib = xmlSchemaAddAttributeUseProhib(pctxt);
        if (prohib == NULL)
            return(NULL);
        prohib->node = node;
        prohib->name = tmpName;
        prohib->targetNamespace = tmpNs;
        if (isRef) {
            /*
            * We need at least to resolve to the attribute declaration.
            */
            WXS_ADD_PENDING(pctxt, prohib);
        }
        return(WXS_BASIC_CAST prohib);
    } else {        
        if (IS_SCHEMA(child, "annotation")) {
            /*
            * TODO: Should this go into the attr decl?
            */
            use->annot = xmlSchemaParseAnnotation(pctxt, child, 1);
            child = child->next;
        }
        if (isRef) {
            if (child != NULL) {
                if (IS_SCHEMA(child, "simpleType"))
                    /*
                    * 3.2.3 : 3.2
                    * If ref is present, then all of <simpleType>,
                    * form and type must be absent.
                    */
                    xmlSchemaPContentErr(pctxt,
                        XML_SCHEMAP_SRC_ATTRIBUTE_3_2,
                        NULL, node, child, NULL,
                        "(annotation?)");
                else
                    xmlSchemaPContentErr(pctxt,
                        XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                        NULL, node, child, NULL,
                        "(annotation?)");
            }
        } else {
            if (IS_SCHEMA(child, "simpleType")) {
                if (WXS_ATTRUSE_DECL(use)->typeName != NULL) {
                    /*
                    * 3.2.3 : 4
                    * type and <simpleType> must not both be present.
                    */
                    xmlSchemaPContentErr(pctxt, XML_SCHEMAP_SRC_ATTRIBUTE_4,
                        NULL, node, child,
                        "The attribute 'type' and the <simpleType> child "
                        "are mutually exclusive", NULL);
                } else
                    WXS_ATTRUSE_TYPEDEF(use) =
                        xmlSchemaParseSimpleType(pctxt, schema, child, 0);
                child = child->next;
            }
            if (child != NULL)
                xmlSchemaPContentErr(pctxt, XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "(annotation?, simpleType?)");
        }
    }   
    return (WXS_BASIC_CAST use);
}


static xmlSchemaAttributePtr
xmlSchemaParseGlobalAttribute(xmlSchemaParserCtxtPtr pctxt,
                              xmlSchemaPtr schema,
                              xmlNodePtr node)
{
    const xmlChar *attrValue;
    xmlSchemaAttributePtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    /*
     * Note that the w3c spec assumes the schema to be validated with schema
     * for schemas beforehand.
     *
     * 3.2.3 Constraints on XML Representations of Attribute Declarations
     */
    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);        
    /*
    * 3.2.3 : 3.1
    * One of ref or name must be present, but not both
    */
    attr = xmlSchemaGetPropNode(node, "name");
    if (attr == NULL) {
        xmlSchemaPMissingAttrErr(pctxt, XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node, "name", NULL);
        return (NULL);
    }
    if (xmlSchemaPValAttrNode(pctxt, NULL, attr,
        xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &attrValue) != 0) {
        return (NULL);
    }
    /*
    * 3.2.6 Schema Component Constraint: xmlns Not Allowed
    * TODO: Move this to the component layer.
    */
    if (xmlStrEqual(attrValue, BAD_CAST "xmlns")) {
        xmlSchemaPSimpleTypeErr(pctxt,
            XML_SCHEMAP_NO_XMLNS,
            NULL, (xmlNodePtr) attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), NULL, NULL,
            "The value of the attribute must not match 'xmlns'",
            NULL, NULL);
        return (NULL);
    }
    /*
    * 3.2.6 Schema Component Constraint: xsi: Not Allowed
    * TODO: Move this to the component layer.
    *       Or better leave it here and add it to the component layer
    *       if we have a schema construction API.
    */
    if (xmlStrEqual(pctxt->targetNamespace, xmlSchemaInstanceNs)) {
        xmlSchemaCustomErr(ACTXT_CAST pctxt,
            XML_SCHEMAP_NO_XSI, node, NULL,
            "The target namespace must not match '%s'",
            xmlSchemaInstanceNs, NULL);
    }

    ret = xmlSchemaAddAttribute(pctxt, schema, attrValue,
        pctxt->targetNamespace, node, 1);
    if (ret == NULL)
        return (NULL);
    ret->flags |= XML_SCHEMAS_ATTR_GLOBAL;
        
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "default")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "fixed")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "name")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "type")))
            {
                xmlSchemaPIllegalAttrErr(pctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);              
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(pctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    xmlSchemaPValAttrQName(pctxt, schema, NULL,
        node, "type", &ret->typeNs, &ret->typeName);
    
    xmlSchemaPValAttrID(pctxt, node, BAD_CAST "id");
    /*
    * Attribute "fixed".
    */
    ret->defValue = xmlSchemaGetProp(pctxt, node, "fixed");
    if (ret->defValue != NULL)
        ret->flags |= XML_SCHEMAS_ATTR_FIXED;
    /*
    * Attribute "default".
    */
    attr = xmlSchemaGetPropNode(node, "default");
    if (attr != NULL) {
        /*
        * 3.2.3 : 1
        * default and fixed must not both be present.
        */
        if (ret->flags & XML_SCHEMAS_ATTR_FIXED) {
            xmlSchemaPMutualExclAttrErr(pctxt, XML_SCHEMAP_SRC_ATTRIBUTE_1,
                WXS_BASIC_CAST ret, attr, "default", "fixed");
        } else
            ret->defValue = xmlSchemaGetNodeContent(pctxt, (xmlNodePtr) attr);
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        ret->annot = xmlSchemaParseAnnotation(pctxt, child, 1);
        child = child->next;
    }
    if (IS_SCHEMA(child, "simpleType")) {
        if (ret->typeName != NULL) {
            /*
            * 3.2.3 : 4
            * type and <simpleType> must not both be present.
            */
            xmlSchemaPContentErr(pctxt, XML_SCHEMAP_SRC_ATTRIBUTE_4,
                NULL, node, child,
                "The attribute 'type' and the <simpleType> child "
                "are mutually exclusive", NULL);
        } else
            ret->subtypes = xmlSchemaParseSimpleType(pctxt, schema, child, 0);
        child = child->next;
    }
    if (child != NULL)
        xmlSchemaPContentErr(pctxt, XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL,
            "(annotation?, simpleType?)");

    return (ret);
}

/**
 * xmlSchemaParseAttributeGroupRef:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parse an attribute group definition reference.
 * Note that a reference to an attribute group does not
 * correspond to any component at all.
 * *WARNING* this interface is highly subject to change
 *
 * Returns the attribute group or NULL in case of error.
 */
static xmlSchemaQNameRefPtr
xmlSchemaParseAttributeGroupRef(xmlSchemaParserCtxtPtr pctxt,
                                xmlSchemaPtr schema,
                                xmlNodePtr node)
{
    xmlSchemaQNameRefPtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *refNs = NULL, *ref = NULL;

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    attr = xmlSchemaGetPropNode(node, "ref");
    if (attr == NULL) {
        xmlSchemaPMissingAttrErr(pctxt,
            XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node, "ref", NULL);
        return (NULL);
    }   
    xmlSchemaPValAttrNodeQName(pctxt, schema,
        NULL, attr, &refNs, &ref);
    if (xmlSchemaCheckReference(pctxt, schema, node, attr, refNs) != 0)
        return(NULL);
   
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "ref")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "id")))
            {
                xmlSchemaPIllegalAttrErr(pctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(pctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    /* Attribute ID */
    xmlSchemaPValAttrID(pctxt, node, BAD_CAST "id");

    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
        * TODO: We do not have a place to store the annotation, do we?
        */
        xmlSchemaParseAnnotation(pctxt, child, 0);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(pctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL,
            "(annotation?)");
    }

    /*
    * Handle attribute group redefinitions.
    */
    if (pctxt->isRedefine && pctxt->redef &&
        (pctxt->redef->item->type ==
            XML_SCHEMA_TYPE_ATTRIBUTEGROUP) &&
        (ref == pctxt->redef->refName) &&
        (refNs == pctxt->redef->refTargetNs))
    {
        /*
        * SPEC src-redefine:
        * (7.1) "If it has an <attributeGroup> among its contents
        * the ·actual value· of whose ref [attribute] is the same
        * as the ·actual value· of its own name attribute plus
        * target namespace, then it must have exactly one such group."
        */
        if (pctxt->redefCounter != 0) {
            xmlChar *str = NULL;
            
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                XML_SCHEMAP_SRC_REDEFINE, node, NULL,
                "The redefining attribute group definition "
                "'%s' must not contain more than one "
                "reference to the redefined definition",
                xmlSchemaFormatQName(&str, refNs, ref), NULL);
            FREE_AND_NULL(str);
            return(NULL);
        }
        pctxt->redefCounter++;
        /*
        * URGENT TODO: How to ensure that the reference will not be
        * handled by the normal component resolution mechanism?
        */
        ret = xmlSchemaNewQNameRef(pctxt,
            XML_SCHEMA_TYPE_ATTRIBUTEGROUP, ref, refNs);
        if (ret == NULL)
            return(NULL);
        ret->node = node;
        pctxt->redef->reference = WXS_BASIC_CAST ret;
    } else {
        /*
        * Create a QName-reference helper component. We will substitute this
        * component for the attribute uses of the referenced attribute group
        * definition.
        */
        ret = xmlSchemaNewQNameRef(pctxt,
            XML_SCHEMA_TYPE_ATTRIBUTEGROUP, ref, refNs);
        if (ret == NULL)
            return(NULL);
        ret->node = node;
        /* Add to pending items, to be able to resolve the reference. */
        WXS_ADD_PENDING(pctxt, ret);
    }    
    return (ret);
}

/**
 * xmlSchemaParseAttributeGroupDefinition:
 * @pctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Attribute Group declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the attribute group definition or NULL in case of error.
 */
static xmlSchemaAttributeGroupPtr
xmlSchemaParseAttributeGroupDefinition(xmlSchemaParserCtxtPtr pctxt,
                                       xmlSchemaPtr schema,
                                       xmlNodePtr node)
{
    const xmlChar *name;
    xmlSchemaAttributeGroupPtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    int hasRefs = 0;

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    attr = xmlSchemaGetPropNode(node, "name");
    if (attr == NULL) {
        xmlSchemaPMissingAttrErr(pctxt,
            XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node, "name", NULL);
        return (NULL);
    }
    /*
    * The name is crucial, exit if invalid.
    */
    if (xmlSchemaPValAttrNode(pctxt,
        NULL, attr,
        xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
        return (NULL);
    }
    ret = xmlSchemaAddAttributeGroupDefinition(pctxt, schema,
        name, pctxt->targetNamespace, node);
    if (ret == NULL)
        return (NULL);  
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "name")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "id")))
            {
                xmlSchemaPIllegalAttrErr(pctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(pctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    /* Attribute ID */
    xmlSchemaPValAttrID(pctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        ret->annot = xmlSchemaParseAnnotation(pctxt, child, 1);
        child = child->next;
    }
    /*
    * Parse contained attribute decls/refs.
    */
    if (xmlSchemaParseLocalAttributes(pctxt, schema, &child,
        (xmlSchemaItemListPtr *) &(ret->attrUses),
        XML_SCHEMA_TYPE_ATTRIBUTEGROUP, &hasRefs) == -1)
        return(NULL);
    if (hasRefs)
        ret->flags |= XML_SCHEMAS_ATTRGROUP_HAS_REFS;
    /*
    * Parse the attribute wildcard.
    */
    if (IS_SCHEMA(child, "anyAttribute")) {
        ret->attributeWildcard = xmlSchemaParseAnyAttribute(pctxt,
            schema, child);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(pctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL,
            "(annotation?, ((attribute | attributeGroup)*, anyAttribute?))");
    }
    return (ret);
}

/**
 * xmlSchemaPValAttrFormDefault:
 * @value:  the value
 * @flags: the flags to be modified
 * @flagQualified: the specific flag for "qualified"
 *
 * Returns 0 if the value is valid, 1 otherwise.
 */
static int
xmlSchemaPValAttrFormDefault(const xmlChar *value,
                             int *flags,
                             int flagQualified)
{
    if (xmlStrEqual(value, BAD_CAST "qualified")) {
        if  ((*flags & flagQualified) == 0)
            *flags |= flagQualified;
    } else if (!xmlStrEqual(value, BAD_CAST "unqualified"))
        return (1);

    return (0);
}

/**
 * xmlSchemaPValAttrBlockFinal:
 * @value:  the value
 * @flags: the flags to be modified
 * @flagAll: the specific flag for "#all"
 * @flagExtension: the specific flag for "extension"
 * @flagRestriction: the specific flag for "restriction"
 * @flagSubstitution: the specific flag for "substitution"
 * @flagList: the specific flag for "list"
 * @flagUnion: the specific flag for "union"
 *
 * Validates the value of the attribute "final" and "block". The value
 * is converted into the specified flag values and returned in @flags.
 *
 * Returns 0 if the value is valid, 1 otherwise.
 */

static int
xmlSchemaPValAttrBlockFinal(const xmlChar *value,
                            int *flags,
                            int flagAll,
                            int flagExtension,
                            int flagRestriction,
                            int flagSubstitution,
                            int flagList,
                            int flagUnion)
{
    int ret = 0;

    /*
    * TODO: This does not check for dublicate entries.
    */
    if ((flags == NULL) || (value == NULL))
        return (-1);
    if (value[0] == 0)
        return (0);
    if (xmlStrEqual(value, BAD_CAST "#all")) {
        if (flagAll != -1)
            *flags |= flagAll;
        else {
            if (flagExtension != -1)
                *flags |= flagExtension;
            if (flagRestriction != -1)
                *flags |= flagRestriction;
            if (flagSubstitution != -1)
                *flags |= flagSubstitution;
            if (flagList != -1)
                *flags |= flagList;
            if (flagUnion != -1)
                *flags |= flagUnion;
        }
    } else {
        const xmlChar *end, *cur = value;
        xmlChar *item;

        do {
            while (IS_BLANK_CH(*cur))
                cur++;
            end = cur;
            while ((*end != 0) && (!(IS_BLANK_CH(*end))))
                end++;
            if (end == cur)
                break;
            item = xmlStrndup(cur, end - cur);
            if (xmlStrEqual(item, BAD_CAST "extension")) {
                if (flagExtension != -1) {
                    if ((*flags & flagExtension) == 0)
                        *flags |= flagExtension;
                } else
                    ret = 1;
            } else if (xmlStrEqual(item, BAD_CAST "restriction")) {
                if (flagRestriction != -1) {
                    if ((*flags & flagRestriction) == 0)
                        *flags |= flagRestriction;
                } else
                    ret = 1;
            } else if (xmlStrEqual(item, BAD_CAST "substitution")) {
                if (flagSubstitution != -1) {
                    if ((*flags & flagSubstitution) == 0)
                        *flags |= flagSubstitution;
                } else
                    ret = 1;
            } else if (xmlStrEqual(item, BAD_CAST "list")) {
                if (flagList != -1) {
                    if ((*flags & flagList) == 0)
                        *flags |= flagList;
                } else
                    ret = 1;
            } else if (xmlStrEqual(item, BAD_CAST "union")) {
                if (flagUnion != -1) {
                    if ((*flags & flagUnion) == 0)
                        *flags |= flagUnion;
                } else
                    ret = 1;
            } else
                ret = 1;
            if (item != NULL)
                xmlFree(item);
            cur = end;
        } while ((ret == 0) && (*cur != 0));
    }

    return (ret);
}

static int
xmlSchemaCheckCSelectorXPath(xmlSchemaParserCtxtPtr ctxt,
                             xmlSchemaIDCPtr idc,
                             xmlSchemaIDCSelectPtr selector,
                             xmlAttrPtr attr,
                             int isField)
{
    xmlNodePtr node;

    /*
    * c-selector-xpath:
    * Schema Component Constraint: Selector Value OK
    *
    * TODO: 1 The {selector} must be a valid XPath expression, as defined
    * in [XPath].
    */
    if (selector == NULL) {
        xmlSchemaPErr(ctxt, idc->node,
            XML_SCHEMAP_INTERNAL,
            "Internal error: xmlSchemaCheckCSelectorXPath, "
            "the selector is not specified.\n", NULL, NULL);
        return (-1);
    }
    if (attr == NULL)
        node = idc->node;
    else
        node = (xmlNodePtr) attr;
    if (selector->xpath == NULL) {
        xmlSchemaPCustomErr(ctxt,
            /* TODO: Adjust error code. */
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            NULL, node,
            "The XPath expression of the selector is not valid", NULL);
        return (XML_SCHEMAP_S4S_ATTR_INVALID_VALUE);
    } else {
        const xmlChar **nsArray = NULL;
        xmlNsPtr *nsList = NULL;
        /*
        * Compile the XPath expression.
        */
        /*
        * TODO: We need the array of in-scope namespaces for compilation.
        * TODO: Call xmlPatterncompile with different options for selector/
        * field.
        */
        if (attr == NULL)
            nsList = NULL;
        else
            nsList = xmlGetNsList(attr->doc, attr->parent);
        /*
        * Build an array of prefixes and namespaces.
        */
        if (nsList != NULL) {
            int i, count = 0;

            for (i = 0; nsList[i] != NULL; i++)
                count++;

            nsArray = (const xmlChar **) xmlMalloc(
                (count * 2 + 1) * sizeof(const xmlChar *));
            if (nsArray == NULL) {
                xmlSchemaPErrMemory(ctxt, "allocating a namespace array",
                    NULL);
                xmlFree(nsList);
                return (-1);
            }
            for (i = 0; i < count; i++) {
                nsArray[2 * i] = nsList[i]->href;
                nsArray[2 * i + 1] = nsList[i]->prefix;
            }
            nsArray[count * 2] = NULL;
            xmlFree(nsList);
        }
        /*
        * TODO: Differentiate between "selector" and "field".
        */
        if (isField)
            selector->xpathComp = (void *) xmlPatterncompile(selector->xpath,
                NULL, XML_PATTERN_XSFIELD, nsArray);
        else
            selector->xpathComp = (void *) xmlPatterncompile(selector->xpath,
                NULL, XML_PATTERN_XSSEL, nsArray);
        if (nsArray != NULL)
            xmlFree((xmlChar **) nsArray);

        if (selector->xpathComp == NULL) {
            xmlSchemaPCustomErr(ctxt,
                /* TODO: Adjust error code? */
                XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                NULL, node,
                "The XPath expression '%s' could not be "
                "compiled", selector->xpath);
            return (XML_SCHEMAP_S4S_ATTR_INVALID_VALUE);
        }
    }
    return (0);
}

#define ADD_ANNOTATION(annot)   \
    xmlSchemaAnnotPtr cur = item->annot; \
    if (item->annot == NULL) {  \
        item->annot = annot;    \
        return (annot);         \
    }                           \
    cur = item->annot;          \
    if (cur->next != NULL) {    \
        cur = cur->next;        \
    }                           \
    cur->next = annot;

/**
 * xmlSchemaAssignAnnotation:
 * @item: the schema component
 * @annot: the annotation
 *
 * Adds the annotation to the given schema component.
 *
 * Returns the given annotaion.
 */
static xmlSchemaAnnotPtr
xmlSchemaAddAnnotation(xmlSchemaAnnotItemPtr annItem,
                       xmlSchemaAnnotPtr annot)
{
    if ((annItem == NULL) || (annot == NULL))
        return (NULL);
    switch (annItem->type) {
        case XML_SCHEMA_TYPE_ELEMENT: {
                xmlSchemaElementPtr item = (xmlSchemaElementPtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_TYPE_ATTRIBUTE: {
                xmlSchemaAttributePtr item = (xmlSchemaAttributePtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
        case XML_SCHEMA_TYPE_ANY: {
                xmlSchemaWildcardPtr item = (xmlSchemaWildcardPtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_TYPE_PARTICLE:
        case XML_SCHEMA_TYPE_IDC_KEY:
        case XML_SCHEMA_TYPE_IDC_KEYREF:
        case XML_SCHEMA_TYPE_IDC_UNIQUE: {
                xmlSchemaAnnotItemPtr item = (xmlSchemaAnnotItemPtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_TYPE_ATTRIBUTEGROUP: {
                xmlSchemaAttributeGroupPtr item =
                    (xmlSchemaAttributeGroupPtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_TYPE_NOTATION: {
                xmlSchemaNotationPtr item = (xmlSchemaNotationPtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_FACET_MININCLUSIVE:
        case XML_SCHEMA_FACET_MINEXCLUSIVE:
        case XML_SCHEMA_FACET_MAXINCLUSIVE:
        case XML_SCHEMA_FACET_MAXEXCLUSIVE:
        case XML_SCHEMA_FACET_TOTALDIGITS:
        case XML_SCHEMA_FACET_FRACTIONDIGITS:
        case XML_SCHEMA_FACET_PATTERN:
        case XML_SCHEMA_FACET_ENUMERATION:
        case XML_SCHEMA_FACET_WHITESPACE:
        case XML_SCHEMA_FACET_LENGTH:
        case XML_SCHEMA_FACET_MAXLENGTH:
        case XML_SCHEMA_FACET_MINLENGTH: {
                xmlSchemaFacetPtr item = (xmlSchemaFacetPtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_TYPE_SIMPLE:
        case XML_SCHEMA_TYPE_COMPLEX: {
                xmlSchemaTypePtr item = (xmlSchemaTypePtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_TYPE_GROUP: {
                xmlSchemaModelGroupDefPtr item = (xmlSchemaModelGroupDefPtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        case XML_SCHEMA_TYPE_SEQUENCE:
        case XML_SCHEMA_TYPE_CHOICE:
        case XML_SCHEMA_TYPE_ALL: {
                xmlSchemaModelGroupPtr item = (xmlSchemaModelGroupPtr) annItem;
                ADD_ANNOTATION(annot)
            }
            break;
        default:
             xmlSchemaPCustomErr(NULL,
                XML_SCHEMAP_INTERNAL,
                NULL, NULL,
                "Internal error: xmlSchemaAddAnnotation, "
                "The item is not a annotated schema component", NULL);
             break;
    }
    return (annot);
}

/**
 * xmlSchemaParseIDCSelectorAndField:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parses a XML Schema identity-contraint definition's
 * <selector> and <field> elements.
 *
 * Returns the parsed identity-constraint definition.
 */
static xmlSchemaIDCSelectPtr
xmlSchemaParseIDCSelectorAndField(xmlSchemaParserCtxtPtr ctxt,                    
                          xmlSchemaIDCPtr idc,
                          xmlNodePtr node,
                          int isField)
{
    xmlSchemaIDCSelectPtr item;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "xpath"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    /*
    * Create the item.
    */
    item = (xmlSchemaIDCSelectPtr) xmlMalloc(sizeof(xmlSchemaIDCSelect));
    if (item == NULL) {
        xmlSchemaPErrMemory(ctxt,
            "allocating a 'selector' of an identity-constraint definition",
            NULL);
        return (NULL);
    }
    memset(item, 0, sizeof(xmlSchemaIDCSelect));
    /*
    * Attribute "xpath" (mandatory).
    */
    attr = xmlSchemaGetPropNode(node, "xpath");
    if (attr == NULL) {
        xmlSchemaPMissingAttrErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node,
            "name", NULL);
    } else {
        item->xpath = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
        /*
        * URGENT TODO: "field"s have an other syntax than "selector"s.
        */

        if (xmlSchemaCheckCSelectorXPath(ctxt, idc, item, attr,
            isField) == -1) {
            xmlSchemaPErr(ctxt,
                (xmlNodePtr) attr,
                XML_SCHEMAP_INTERNAL,
                "Internal error: xmlSchemaParseIDCSelectorAndField, "
                "validating the XPath expression of a IDC selector.\n",
                NULL, NULL);
        }

    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
        * Add the annotation to the parent IDC.
        */
        xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) idc,
            xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child,
            NULL, "(annotation?)");
    }

    return (item);
}

/**
 * xmlSchemaParseIDC:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parses a XML Schema identity-contraint definition.
 *
 * Returns the parsed identity-constraint definition.
 */
static xmlSchemaIDCPtr
xmlSchemaParseIDC(xmlSchemaParserCtxtPtr ctxt,
                  xmlSchemaPtr schema,
                  xmlNodePtr node,
                  xmlSchemaTypeType idcCategory,
                  const xmlChar *targetNamespace)
{
    xmlSchemaIDCPtr item = NULL;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *name = NULL;
    xmlSchemaIDCSelectPtr field = NULL, lastField = NULL;

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "name")) &&
                ((idcCategory != XML_SCHEMA_TYPE_IDC_KEYREF) ||
                 (!xmlStrEqual(attr->name, BAD_CAST "refer")))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    /*
    * Attribute "name" (mandatory).
    */
    attr = xmlSchemaGetPropNode(node, "name");
    if (attr == NULL) {
        xmlSchemaPMissingAttrErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node,
            "name", NULL);
        return (NULL);
    } else if (xmlSchemaPValAttrNode(ctxt,
        NULL, attr,
        xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
        return (NULL);
    }
    /* Create the component. */
    item = xmlSchemaAddIDC(ctxt, schema, name, targetNamespace,
        idcCategory, node);
    if (item == NULL)
        return(NULL);

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    if (idcCategory == XML_SCHEMA_TYPE_IDC_KEYREF) {
        /*
        * Attribute "refer" (mandatory).
        */
        attr = xmlSchemaGetPropNode(node, "refer");
        if (attr == NULL) {
            xmlSchemaPMissingAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_MISSING,
                NULL, node,
                "refer", NULL);
        } else {
            /*
            * Create a reference item.
            */
            item->ref = xmlSchemaNewQNameRef(ctxt, XML_SCHEMA_TYPE_IDC_KEY,
                NULL, NULL);
            if (item->ref == NULL)
                return (NULL);
            xmlSchemaPValAttrNodeQName(ctxt, schema,
                NULL, attr,
                &(item->ref->targetNamespace),
                &(item->ref->name));
            xmlSchemaCheckReference(ctxt, schema, node, attr,
                item->ref->targetNamespace);
        }
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        item->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child == NULL) {
        xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_MISSING,
                NULL, node, child,
                "A child element is missing",
                "(annotation?, (selector, field+))");
    }
    /*
    * Child element <selector>.
    */
    if (IS_SCHEMA(child, "selector")) {
        item->selector = xmlSchemaParseIDCSelectorAndField(ctxt,
            item, child, 0);
        child = child->next;
        /*
        * Child elements <field>.
        */
        if (IS_SCHEMA(child, "field")) {
            do {
                field = xmlSchemaParseIDCSelectorAndField(ctxt,
                    item, child, 1);
                if (field != NULL) {
                    field->index = item->nbFields;
                    item->nbFields++;
                    if (lastField != NULL)
                        lastField->next = field;
                    else
                        item->fields = field;
                    lastField = field;
                }
                child = child->next;
            } while (IS_SCHEMA(child, "field"));
        } else {
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child,
                NULL, "(annotation?, (selector, field+))");
        }
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child,
            NULL, "(annotation?, (selector, field+))");
    }

    return (item);
}

/**
 * xmlSchemaParseElement:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 * @topLevel: indicates if this is global declaration
 *
 * Parses a XML schema element declaration.
 * *WARNING* this interface is highly subject to change
 *
 * Returns the element declaration or a particle; NULL in case
 * of an error or if the particle has minOccurs==maxOccurs==0.
 */
static xmlSchemaBasicItemPtr
xmlSchemaParseElement(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                      xmlNodePtr node, int *isElemRef, int topLevel)
{
    xmlSchemaElementPtr decl = NULL;
    xmlSchemaParticlePtr particle = NULL;
    xmlSchemaAnnotPtr annot = NULL;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr, nameAttr;
    int min, max, isRef = 0;
    xmlChar *des = NULL;

    /* 3.3.3 Constraints on XML Representations of Element Declarations */
    /* TODO: Complete implementation of 3.3.6 */

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    if (isElemRef != NULL)
        *isElemRef = 0;
    /*
    * If we get a "ref" attribute on a local <element> we will assume it's
    * a reference - even if there's a "name" attribute; this seems to be more
    * robust.
    */
    nameAttr = xmlSchemaGetPropNode(node, "name");
    attr = xmlSchemaGetPropNode(node, "ref");
    if ((topLevel) || (attr == NULL)) {
        if (nameAttr == NULL) {
            xmlSchemaPMissingAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_MISSING,
                NULL, node, "name", NULL);
            return (NULL);
        }
    } else
        isRef = 1;

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    /*
    * Skip particle part if a global declaration.
    */
    if (topLevel)
        goto declaration_part;
    /*
    * The particle part ==================================================
    */
    min = xmlGetMinOccurs(ctxt, node, 0, -1, 1, "xs:nonNegativeInteger");
    max = xmlGetMaxOccurs(ctxt, node, 0, UNBOUNDED, 1, "(xs:nonNegativeInteger | unbounded)");
    xmlSchemaPCheckParticleCorrect_2(ctxt, NULL, node, min, max);
    particle = xmlSchemaAddParticle(ctxt, node, min, max);
    if (particle == NULL)
        goto return_null;

    /* ret->flags |= XML_SCHEMAS_ELEM_REF; */

    if (isRef) {
        const xmlChar *refNs = NULL, *ref = NULL;
        xmlSchemaQNameRefPtr refer = NULL;
        /*
        * The reference part =============================================
        */
        if (isElemRef != NULL)
            *isElemRef = 1;

        xmlSchemaPValAttrNodeQName(ctxt, schema,
            NULL, attr, &refNs, &ref);
        xmlSchemaCheckReference(ctxt, schema, node, attr, refNs);
        /*
        * SPEC (3.3.3 : 2.1) "One of ref or name must be present, but not both"
        */
        if (nameAttr != NULL) {
            xmlSchemaPMutualExclAttrErr(ctxt,
                XML_SCHEMAP_SRC_ELEMENT_2_1, NULL, nameAttr, "ref", "name");
        }
        /*
        * Check for illegal attributes.
        */
        attr = node->properties;
        while (attr != NULL) {
            if (attr->ns == NULL) {
                if (xmlStrEqual(attr->name, BAD_CAST "ref") ||
                    xmlStrEqual(attr->name, BAD_CAST "name") ||
                    xmlStrEqual(attr->name, BAD_CAST "id") ||
                    xmlStrEqual(attr->name, BAD_CAST "maxOccurs") ||
                    xmlStrEqual(attr->name, BAD_CAST "minOccurs"))
                {
                    attr = attr->next;
                    continue;
                } else {
                    /* SPEC (3.3.3 : 2.2) */
                    xmlSchemaPCustomAttrErr(ctxt,
                        XML_SCHEMAP_SRC_ELEMENT_2_2,
                        NULL, NULL, attr,
                        "Only the attributes 'minOccurs', 'maxOccurs' and "
                        "'id' are allowed in addition to 'ref'");
                    break;
                }
            } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
            attr = attr->next;
        }
        /*
        * No children except <annotation> expected.
        */
        if (child != NULL) {
            xmlSchemaPContentErr(ctxt, XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL, "(annotation?)");
        }
        if ((min == 0) && (max == 0))
            goto return_null;
        /*
        * Create the reference item and attach it to the particle.
        */
        refer = xmlSchemaNewQNameRef(ctxt, XML_SCHEMA_TYPE_ELEMENT,
            ref, refNs);
        if (refer == NULL)
            goto return_null;
        particle->children = (xmlSchemaTreeItemPtr) refer;
        particle->annot = annot;
        /*
        * Add the particle to pending components, since the reference
        * need to be resolved.
        */
        WXS_ADD_PENDING(ctxt, particle);
        return ((xmlSchemaBasicItemPtr) particle);
    }
    /*
    * The declaration part ===============================================
    */
declaration_part:
    {
        const xmlChar *ns = NULL, *fixed, *name, *attrValue;
        xmlSchemaIDCPtr curIDC = NULL, lastIDC = NULL;

        if (xmlSchemaPValAttrNode(ctxt, NULL, nameAttr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0)
            goto return_null;
        /*
        * Evaluate the target namespace.
        */
        if (topLevel) {
            ns = ctxt->targetNamespace;
        } else {
            attr = xmlSchemaGetPropNode(node, "form");
            if (attr != NULL) {
                attrValue = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
                if (xmlStrEqual(attrValue, BAD_CAST "qualified")) {
                    ns = ctxt->targetNamespace;
                } else if (!xmlStrEqual(attrValue, BAD_CAST "unqualified")) {
                    xmlSchemaPSimpleTypeErr(ctxt,
                        XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                        NULL, (xmlNodePtr) attr,
                        NULL, "(qualified | unqualified)",
                        attrValue, NULL, NULL, NULL);
                }
            } else if (schema->flags & XML_SCHEMAS_QUALIF_ELEM)
                ns = ctxt->targetNamespace;
        }
        decl = xmlSchemaAddElement(ctxt, name, ns, node, topLevel);
        if (decl == NULL) {
            goto return_null;
        }
        /*
        * Check for illegal attributes.
        */
        attr = node->properties;
        while (attr != NULL) {
            if (attr->ns == NULL) {
                if ((!xmlStrEqual(attr->name, BAD_CAST "name")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "type")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "default")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "fixed")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "block")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "nillable")))
                {
                    if (topLevel == 0) {
                        if ((!xmlStrEqual(attr->name, BAD_CAST "maxOccurs")) &&
                            (!xmlStrEqual(attr->name, BAD_CAST "minOccurs")) &&
                            (!xmlStrEqual(attr->name, BAD_CAST "form")))
                        {
                            xmlSchemaPIllegalAttrErr(ctxt,
                                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                        }
                    } else if ((!xmlStrEqual(attr->name, BAD_CAST "final")) &&
                        (!xmlStrEqual(attr->name, BAD_CAST "abstract")) &&
                        (!xmlStrEqual(attr->name, BAD_CAST "substitutionGroup"))) {

                        xmlSchemaPIllegalAttrErr(ctxt,
                            XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                    }
                }
            } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {

                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
            attr = attr->next;
        }
        /*
        * Extract/validate attributes.
        */
        if (topLevel) {
            /*
            * Process top attributes of global element declarations here.
            */
            decl->flags |= XML_SCHEMAS_ELEM_GLOBAL;
            decl->flags |= XML_SCHEMAS_ELEM_TOPLEVEL;
            xmlSchemaPValAttrQName(ctxt, schema,
                NULL, node, "substitutionGroup",
                &(decl->substGroupNs), &(decl->substGroup));
            if (xmlGetBooleanProp(ctxt, node, "abstract", 0))
                decl->flags |= XML_SCHEMAS_ELEM_ABSTRACT;
            /*
            * Attribute "final".
            */
            attr = xmlSchemaGetPropNode(node, "final");
            if (attr == NULL) {
                if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_EXTENSION)
                    decl->flags |= XML_SCHEMAS_ELEM_FINAL_EXTENSION;
                if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION)
                    decl->flags |= XML_SCHEMAS_ELEM_FINAL_RESTRICTION;
            } else {
                attrValue = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
                if (xmlSchemaPValAttrBlockFinal(attrValue, &(decl->flags),
                    -1,
                    XML_SCHEMAS_ELEM_FINAL_EXTENSION,
                    XML_SCHEMAS_ELEM_FINAL_RESTRICTION, -1, -1, -1) != 0) {
                    xmlSchemaPSimpleTypeErr(ctxt,
                        XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                        NULL, (xmlNodePtr) attr,
                        NULL, "(#all | List of (extension | restriction))",
                        attrValue, NULL, NULL, NULL);
                }
            }
        }
        /*
        * Attribute "block".
        */
        attr = xmlSchemaGetPropNode(node, "block");
        if (attr == NULL) {
            /*
            * Apply default "block" values.
            */
            if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION)
                decl->flags |= XML_SCHEMAS_ELEM_BLOCK_RESTRICTION;
            if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION)
                decl->flags |= XML_SCHEMAS_ELEM_BLOCK_EXTENSION;
            if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION)
                decl->flags |= XML_SCHEMAS_ELEM_BLOCK_SUBSTITUTION;
        } else {
            attrValue = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
            if (xmlSchemaPValAttrBlockFinal(attrValue, &(decl->flags),
                -1,
                XML_SCHEMAS_ELEM_BLOCK_EXTENSION,
                XML_SCHEMAS_ELEM_BLOCK_RESTRICTION,
                XML_SCHEMAS_ELEM_BLOCK_SUBSTITUTION, -1, -1) != 0) {
                xmlSchemaPSimpleTypeErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                    NULL, (xmlNodePtr) attr,
                    NULL, "(#all | List of (extension | "
                    "restriction | substitution))", attrValue,
                    NULL, NULL, NULL);
            }
        }
        if (xmlGetBooleanProp(ctxt, node, "nillable", 0))
            decl->flags |= XML_SCHEMAS_ELEM_NILLABLE;

        attr = xmlSchemaGetPropNode(node, "type");
        if (attr != NULL) {
            xmlSchemaPValAttrNodeQName(ctxt, schema,
                NULL, attr,
                &(decl->namedTypeNs), &(decl->namedType));
            xmlSchemaCheckReference(ctxt, schema, node,
                attr, decl->namedTypeNs);
        }
        decl->value = xmlSchemaGetProp(ctxt, node, "default");
        attr = xmlSchemaGetPropNode(node, "fixed");
        if (attr != NULL) {
            fixed = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
            if (decl->value != NULL) {
                /*
                * 3.3.3 : 1
                * default and fixed must not both be present.
                */
                xmlSchemaPMutualExclAttrErr(ctxt,
                    XML_SCHEMAP_SRC_ELEMENT_1,
                    NULL, attr, "default", "fixed");
            } else {
                decl->flags |= XML_SCHEMAS_ELEM_FIXED;
                decl->value = fixed;
            }
        }
        /*
        * And now for the children...
        */
        if (IS_SCHEMA(child, "complexType")) {
            /*
            * 3.3.3 : 3
            * "type" and either <simpleType> or <complexType> are mutually
            * exclusive
            */
            if (decl->namedType != NULL) {
                xmlSchemaPContentErr(ctxt,
                    XML_SCHEMAP_SRC_ELEMENT_3,
                    NULL, node, child,
                    "The attribute 'type' and the <complexType> child are "
                    "mutually exclusive", NULL);
            } else
                WXS_ELEM_TYPEDEF(decl) = xmlSchemaParseComplexType(ctxt, schema, child, 0);
            child = child->next;
        } else if (IS_SCHEMA(child, "simpleType")) {
            /*
            * 3.3.3 : 3
            * "type" and either <simpleType> or <complexType> are
            * mutually exclusive
            */
            if (decl->namedType != NULL) {
                xmlSchemaPContentErr(ctxt,
                    XML_SCHEMAP_SRC_ELEMENT_3,
                    NULL, node, child,
                    "The attribute 'type' and the <simpleType> child are "
                    "mutually exclusive", NULL);
            } else
                WXS_ELEM_TYPEDEF(decl) = xmlSchemaParseSimpleType(ctxt, schema, child, 0);
            child = child->next;
        }
        while ((IS_SCHEMA(child, "unique")) ||
            (IS_SCHEMA(child, "key")) || (IS_SCHEMA(child, "keyref"))) {
            if (IS_SCHEMA(child, "unique")) {
                curIDC = xmlSchemaParseIDC(ctxt, schema, child,
                    XML_SCHEMA_TYPE_IDC_UNIQUE, decl->targetNamespace);
            } else if (IS_SCHEMA(child, "key")) {
                curIDC = xmlSchemaParseIDC(ctxt, schema, child,
                    XML_SCHEMA_TYPE_IDC_KEY, decl->targetNamespace);
            } else if (IS_SCHEMA(child, "keyref")) {
                curIDC = xmlSchemaParseIDC(ctxt, schema, child,
                    XML_SCHEMA_TYPE_IDC_KEYREF, decl->targetNamespace);
            }
            if (lastIDC != NULL)
                lastIDC->next = curIDC;
            else
                decl->idcs = (void *) curIDC;
            lastIDC = curIDC;
            child = child->next;
        }
        if (child != NULL) {
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child,
                NULL, "(annotation?, ((simpleType | complexType)?, "
                "(unique | key | keyref)*))");
        }
        decl->annot = annot;
    }
    /*
    * NOTE: Element Declaration Representation OK 4. will be checked at a
    * different layer.
    */
    FREE_AND_NULL(des)
    if (topLevel)
        return ((xmlSchemaBasicItemPtr) decl);
    else {
        particle->children = (xmlSchemaTreeItemPtr) decl;
        return ((xmlSchemaBasicItemPtr) particle);
    }

return_null:
    FREE_AND_NULL(des);
    if (annot != NULL) {
        if (particle != NULL)
            particle->annot = NULL;
        if (decl != NULL)
            decl->annot = NULL;
        xmlSchemaFreeAnnot(annot);
    }
    return (NULL);
}

/**
 * xmlSchemaParseUnion:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Union definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of internal error, 0 in case of success and a positive
 * error code otherwise.
 */
static int
xmlSchemaParseUnion(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                    xmlNodePtr node)
{
    xmlSchemaTypePtr type;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *cur = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (-1);
    /* Not a component, don't create it. */
    type = ctxt->ctxtType;
    /*
    * Mark the simple type as being of variety "union".
    */
    type->flags |= XML_SCHEMAS_TYPE_VARIETY_UNION;
    /*
    * SPEC (Base type) (2) "If the <list> or <union> alternative is chosen,
    * then the ·simple ur-type definition·."
    */
    type->baseType = xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYSIMPLETYPE);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "memberTypes"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * Attribute "memberTypes". This is a list of QNames.
    * TODO: Check the value to contain anything.
    */
    attr = xmlSchemaGetPropNode(node, "memberTypes");
    if (attr != NULL) {
        const xmlChar *end;
        xmlChar *tmp;
        const xmlChar *localName, *nsName;
        xmlSchemaTypeLinkPtr link, lastLink = NULL;
        xmlSchemaQNameRefPtr ref;

        cur = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
        type->base = cur;
        do {
            while (IS_BLANK_CH(*cur))
                cur++;
            end = cur;
            while ((*end != 0) && (!(IS_BLANK_CH(*end))))
                end++;
            if (end == cur)
                break;
            tmp = xmlStrndup(cur, end - cur);
            if (xmlSchemaPValAttrNodeQNameValue(ctxt, schema,
                NULL, attr, BAD_CAST tmp, &nsName, &localName) == 0) {
                /*
                * Create the member type link.
                */
                link = (xmlSchemaTypeLinkPtr)
                    xmlMalloc(sizeof(xmlSchemaTypeLink));
                if (link == NULL) {
                    xmlSchemaPErrMemory(ctxt, "xmlSchemaParseUnion, "
                        "allocating a type link", NULL);
                    return (-1);
                }
                link->type = NULL;
                link->next = NULL;
                if (lastLink == NULL)
                    type->memberTypes = link;
                else
                    lastLink->next = link;
                lastLink = link;
                /*
                * Create a reference item.
                */
                ref = xmlSchemaNewQNameRef(ctxt, XML_SCHEMA_TYPE_SIMPLE,
                    localName, nsName);
                if (ref == NULL) {
                    FREE_AND_NULL(tmp)
                    return (-1);
                }
                /*
                * Assign the reference to the link, it will be resolved
                * later during fixup of the union simple type.
                */
                link->type = (xmlSchemaTypePtr) ref;
            }
            FREE_AND_NULL(tmp)
            cur = end;
        } while (*cur != 0);

    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
        * Add the annotation to the simple type ancestor.
        */
        xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) type,
            xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (IS_SCHEMA(child, "simpleType")) {
        xmlSchemaTypePtr subtype, last = NULL;

        /*
        * Anchor the member types in the "subtypes" field of the
        * simple type.
        */
        while (IS_SCHEMA(child, "simpleType")) {
            subtype = (xmlSchemaTypePtr)
                xmlSchemaParseSimpleType(ctxt, schema, child, 0);
            if (subtype != NULL) {
                if (last == NULL) {
                    type->subtypes = subtype;
                    last = subtype;
                } else {
                    last->next = subtype;
                    last = subtype;
                }
                last->next = NULL;
            }
            child = child->next;
        }
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL, "(annotation?, simpleType*)");
    }
    if ((attr == NULL) && (type->subtypes == NULL)) {
         /*
        * src-union-memberTypes-or-simpleTypes
        * Either the memberTypes [attribute] of the <union> element must
        * be non-empty or there must be at least one simpleType [child].
        */
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_SRC_UNION_MEMBERTYPES_OR_SIMPLETYPES,
            NULL, node,
            "Either the attribute 'memberTypes' or "
            "at least one <simpleType> child must be present", NULL);
    }
    return (0);
}

/**
 * xmlSchemaParseList:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema List definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 *         1 in case of success.
 */
static xmlSchemaTypePtr
xmlSchemaParseList(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                   xmlNodePtr node)
{
    xmlSchemaTypePtr type;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    /* Not a component, don't create it. */
    type = ctxt->ctxtType;
    /*
    * Mark the type as being of variety "list".
    */
    type->flags |= XML_SCHEMAS_TYPE_VARIETY_LIST;
    /*
    * SPEC (Base type) (2) "If the <list> or <union> alternative is chosen,
    * then the ·simple ur-type definition·."
    */
    type->baseType = xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYSIMPLETYPE);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "itemType"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");

    /*
    * Attribute "itemType". NOTE that we will use the "ref" and "refNs"
    * fields for holding the reference to the itemType.
    *
    * REVAMP TODO: Use the "base" and "baseNs" fields, since we will remove
    * the "ref" fields.
    */
    xmlSchemaPValAttrQName(ctxt, schema, NULL,
        node, "itemType", &(type->baseNs), &(type->base));
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) type,
            xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (IS_SCHEMA(child, "simpleType")) {
        /*
        * src-list-itemType-or-simpleType
        * Either the itemType [attribute] or the <simpleType> [child] of
        * the <list> element must be present, but not both.
        */
        if (type->base != NULL) {
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_SRC_SIMPLE_TYPE_1,
                NULL, node,
                "The attribute 'itemType' and the <simpleType> child "
                "are mutually exclusive", NULL);
        } else {
            type->subtypes = xmlSchemaParseSimpleType(ctxt, schema, child, 0);
        }
        child = child->next;
    } else if (type->base == NULL) {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_SRC_SIMPLE_TYPE_1,
            NULL, node,
            "Either the attribute 'itemType' or the <simpleType> child "
            "must be present", NULL);
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL, "(annotation?, simpleType?)");
    }
    if ((type->base == NULL) &&
        (type->subtypes == NULL) &&
        (xmlSchemaGetPropNode(node, "itemType") == NULL)) {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_SRC_SIMPLE_TYPE_1,
            NULL, node,
            "Either the attribute 'itemType' or the <simpleType> child "
            "must be present", NULL);
    }
    return (NULL);
}

/**
 * xmlSchemaParseSimpleType:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Simple Type definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 * 1 in case of success.
 */
static xmlSchemaTypePtr
xmlSchemaParseSimpleType(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                         xmlNodePtr node, int topLevel)
{
    xmlSchemaTypePtr type, oldCtxtType;
    xmlNodePtr child = NULL;
    const xmlChar *attrValue = NULL;
    xmlAttrPtr attr;
    int hasRestriction = 0;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    if (topLevel) {
        attr = xmlSchemaGetPropNode(node, "name");
        if (attr == NULL) {
            xmlSchemaPMissingAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_MISSING,
                NULL, node,
                "name", NULL);
            return (NULL);
        } else {
            if (xmlSchemaPValAttrNode(ctxt,
                NULL, attr,
                xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &attrValue) != 0)
                return (NULL);
            /*
            * Skip built-in types.
            */
            if (ctxt->isS4S) {
                xmlSchemaTypePtr biType;

                if (ctxt->isRedefine) {
                    /*
                    * REDEFINE: Disallow redefinition of built-in-types.
                    * TODO: It seems that the spec does not say anything
                    * about this case.
                    */
                    xmlSchemaPCustomErr(ctxt, XML_SCHEMAP_SRC_REDEFINE,
                        NULL, node,
                        "Redefinition of built-in simple types is not "
                        "supported", NULL);
                    return(NULL);
                }
                biType = xmlSchemaGetPredefinedType(attrValue, xmlSchemaNs);
                if (biType != NULL)
                    return (biType);
            }
        }
    }
    /*
    * TargetNamespace:
    * SPEC "The ·actual value· of the targetNamespace [attribute]
    * of the <schema> ancestor element information item if present,
    * otherwise ·absent·.
    */
    if (topLevel == 0) {
#ifdef ENABLE_NAMED_LOCALS
        char buf[40];
#endif
        /*
        * Parse as local simple type definition.
        */
#ifdef ENABLE_NAMED_LOCALS
        snprintf(buf, 39, "#ST%d", ctxt->counter++ + 1);
        type = xmlSchemaAddType(ctxt, schema,
            XML_SCHEMA_TYPE_SIMPLE,
            xmlDictLookup(ctxt->dict, (const xmlChar *)buf, -1),
            ctxt->targetNamespace, node, 0);
#else
        type = xmlSchemaAddType(ctxt, schema,
            XML_SCHEMA_TYPE_SIMPLE,
            NULL, ctxt->targetNamespace, node, 0);
#endif
        if (type == NULL)
            return (NULL);
        type->type = XML_SCHEMA_TYPE_SIMPLE;
        type->contentType = XML_SCHEMA_CONTENT_SIMPLE;
        /*
        * Check for illegal attributes.
        */
        attr = node->properties;
        while (attr != NULL) {
            if (attr->ns == NULL) {
                if (!xmlStrEqual(attr->name, BAD_CAST "id")) {
                    xmlSchemaPIllegalAttrErr(ctxt,
                        XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr); 
                }
            } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
                    xmlSchemaPIllegalAttrErr(ctxt,
                        XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
            attr = attr->next;
        }
    } else {
        /*
        * Parse as global simple type definition.
        *
        * Note that attrValue is the value of the attribute "name" here.
        */
        type = xmlSchemaAddType(ctxt, schema, XML_SCHEMA_TYPE_SIMPLE,
            attrValue, ctxt->targetNamespace, node, 1);
        if (type == NULL)
            return (NULL);
        type->type = XML_SCHEMA_TYPE_SIMPLE;
        type->contentType = XML_SCHEMA_CONTENT_SIMPLE;
        type->flags |= XML_SCHEMAS_TYPE_GLOBAL;
        /*
        * Check for illegal attributes.
        */
        attr = node->properties;
        while (attr != NULL) {
            if (attr->ns == NULL) {
                if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "name")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "final"))) {
                    xmlSchemaPIllegalAttrErr(ctxt,
                        XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                }
            } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
            attr = attr->next;
        }
        /*
        * Attribute "final".
        */
        attr = xmlSchemaGetPropNode(node, "final");
        if (attr == NULL) {
            if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION)
                type->flags |= XML_SCHEMAS_TYPE_FINAL_RESTRICTION;
            if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_LIST)
                type->flags |= XML_SCHEMAS_TYPE_FINAL_LIST;
            if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_UNION)
                type->flags |= XML_SCHEMAS_TYPE_FINAL_UNION;
        } else {
            attrValue = xmlSchemaGetProp(ctxt, node, "final");
            if (xmlSchemaPValAttrBlockFinal(attrValue, &(type->flags),
                -1, -1, XML_SCHEMAS_TYPE_FINAL_RESTRICTION, -1,
                XML_SCHEMAS_TYPE_FINAL_LIST,
                XML_SCHEMAS_TYPE_FINAL_UNION) != 0) {

                xmlSchemaPSimpleTypeErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                    WXS_BASIC_CAST type, (xmlNodePtr) attr,
                    NULL, "(#all | List of (list | union | restriction)",
                    attrValue, NULL, NULL, NULL);
            }
        }
    }
    type->targetNamespace = ctxt->targetNamespace;
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    oldCtxtType = ctxt->ctxtType;
    
    ctxt->ctxtType = type;
    
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        type->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child == NULL) {
        xmlSchemaPContentErr(ctxt, XML_SCHEMAP_S4S_ELEM_MISSING,
            NULL, node, child, NULL,
            "(annotation?, (restriction | list | union))");
    } else if (IS_SCHEMA(child, "restriction")) {       
        xmlSchemaParseRestriction(ctxt, schema, child,
            XML_SCHEMA_TYPE_SIMPLE);    
        hasRestriction = 1;     
        child = child->next;
    } else if (IS_SCHEMA(child, "list")) {
        xmlSchemaParseList(ctxt, schema, child);
        child = child->next;
    } else if (IS_SCHEMA(child, "union")) {
        xmlSchemaParseUnion(ctxt, schema, child);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt, XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL,
            "(annotation?, (restriction | list | union))");
    }
    /*
    * REDEFINE: SPEC src-redefine (5)
    * "Within the [children], each <simpleType> must have a
    * <restriction> among its [children] ... the ·actual value· of whose
    * base [attribute] must be the same as the ·actual value· of its own
    * name attribute plus target namespace;"
    */
    if (topLevel && ctxt->isRedefine && (! hasRestriction)) {
        xmlSchemaPCustomErr(ctxt, XML_SCHEMAP_SRC_REDEFINE,
            NULL, node, "This is a redefinition, thus the "
            "<simpleType> must have a <restriction> child", NULL);
    }
    
    ctxt->ctxtType = oldCtxtType;
    return (type);
}

/**
 * xmlSchemaParseModelGroupDefRef:
 * @ctxt:  the parser context
 * @schema: the schema being built
 * @node:  the node
 *
 * Parses a reference to a model group definition.
 *
 * We will return a particle component with a qname-component or
 * NULL in case of an error.
 */
static xmlSchemaTreeItemPtr
xmlSchemaParseModelGroupDefRef(xmlSchemaParserCtxtPtr ctxt,
                               xmlSchemaPtr schema,
                               xmlNodePtr node)
{
    xmlSchemaParticlePtr item;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *ref = NULL, *refNs = NULL;
    int min, max;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    attr = xmlSchemaGetPropNode(node, "ref");
    if (attr == NULL) {
        xmlSchemaPMissingAttrErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node, "ref", NULL);
        return (NULL);
    } else if (xmlSchemaPValAttrNodeQName(ctxt, schema, NULL,
        attr, &refNs, &ref) != 0) {
        return (NULL);
    }
    xmlSchemaCheckReference(ctxt, schema, node, attr, refNs);
    min = xmlGetMinOccurs(ctxt, node, 0, -1, 1, "xs:nonNegativeInteger");
    max = xmlGetMaxOccurs(ctxt, node, 0, UNBOUNDED, 1,
        "(xs:nonNegativeInteger | unbounded)");
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "ref")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "minOccurs")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "maxOccurs"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    item = xmlSchemaAddParticle(ctxt, node, min, max);
    if (item == NULL)
        return (NULL);    
    /*
    * Create a qname-reference and set as the term; it will be substituted
    * for the model group after the reference has been resolved.
    */
    item->children = (xmlSchemaTreeItemPtr)
        xmlSchemaNewQNameRef(ctxt, XML_SCHEMA_TYPE_GROUP, ref, refNs);    
    xmlSchemaPCheckParticleCorrect_2(ctxt, item, node, min, max);
    /*
    * And now for the children...
    */
    child = node->children;
    /* TODO: Is annotation even allowed for a model group reference? */
    if (IS_SCHEMA(child, "annotation")) {
        /*
        * TODO: What to do exactly with the annotation?
        */
        item->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL,
            "(annotation?)");
    }
    /*
    * Corresponds to no component at all if minOccurs==maxOccurs==0.
    */
    if ((min == 0) && (max == 0))
        return (NULL);

    return ((xmlSchemaTreeItemPtr) item);
}

/**
 * xmlSchemaParseModelGroupDefinition:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parses a XML schema model group definition.
 *
 * Note that the contraint src-redefine (6.2) can't be applied until
 * references have been resolved. So we will do this at the
 * component fixup level.
 *    
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 *         1 in case of success.
 */
static xmlSchemaModelGroupDefPtr
xmlSchemaParseModelGroupDefinition(xmlSchemaParserCtxtPtr ctxt,
                                   xmlSchemaPtr schema,
                                   xmlNodePtr node)
{
    xmlSchemaModelGroupDefPtr item;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *name;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    attr = xmlSchemaGetPropNode(node, "name");
    if (attr == NULL) {
        xmlSchemaPMissingAttrErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node,
            "name", NULL);
        return (NULL);
    } else if (xmlSchemaPValAttrNode(ctxt, NULL, attr,
        xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
        return (NULL);
    }
    item = xmlSchemaAddModelGroupDefinition(ctxt, schema, name,
        ctxt->targetNamespace, node);
    if (item == NULL)
        return (NULL);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "name")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "id"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        item->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (IS_SCHEMA(child, "all")) {
        item->children = xmlSchemaParseModelGroup(ctxt, schema, child,
            XML_SCHEMA_TYPE_ALL, 0);
        child = child->next;
    } else if (IS_SCHEMA(child, "choice")) {
        item->children = xmlSchemaParseModelGroup(ctxt, schema, child,
            XML_SCHEMA_TYPE_CHOICE, 0);
        child = child->next;
    } else if (IS_SCHEMA(child, "sequence")) {
        item->children = xmlSchemaParseModelGroup(ctxt, schema, child,
            XML_SCHEMA_TYPE_SEQUENCE, 0);
        child = child->next;
    }

   

    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL,
            "(annotation?, (all | choice | sequence)?)");
    }
    return (item);
}

/**
 * xmlSchemaCleanupDoc:
 * @ctxt:  a schema validation context
 * @node:  the root of the document.
 *
 * removes unwanted nodes in a schemas document tree
 */
static void
xmlSchemaCleanupDoc(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr root)
{
    xmlNodePtr delete, cur;

    if ((ctxt == NULL) || (root == NULL)) return;

    /*
     * Remove all the blank text nodes
     */
    delete = NULL;
    cur = root;
    while (cur != NULL) {
        if (delete != NULL) {
            xmlUnlinkNode(delete);
            xmlFreeNode(delete);
            delete = NULL;
        }
        if (cur->type == XML_TEXT_NODE) {
            if (IS_BLANK_NODE(cur)) {
                if (xmlNodeGetSpacePreserve(cur) != 1) {
                    delete = cur;
                }
            }
        } else if ((cur->type != XML_ELEMENT_NODE) &&
                   (cur->type != XML_CDATA_SECTION_NODE)) {
            delete = cur;
            goto skip_children;
        }

        /*
         * Skip to next node
         */
        if (cur->children != NULL) {
            if ((cur->children->type != XML_ENTITY_DECL) &&
                (cur->children->type != XML_ENTITY_REF_NODE) &&
                (cur->children->type != XML_ENTITY_NODE)) {
                cur = cur->children;
                continue;
            }
        }
      skip_children:
        if (cur->next != NULL) {
            cur = cur->next;
            continue;
        }

        do {
            cur = cur->parent;
            if (cur == NULL)
                break;
            if (cur == root) {
                cur = NULL;
                break;
            }
            if (cur->next != NULL) {
                cur = cur->next;
                break;
            }
        } while (cur != NULL);
    }
    if (delete != NULL) {
        xmlUnlinkNode(delete);
        xmlFreeNode(delete);
        delete = NULL;
    }
}


static void
xmlSchemaClearSchemaDefaults(xmlSchemaPtr schema)
{
    if (schema->flags & XML_SCHEMAS_QUALIF_ELEM)
        schema->flags ^= XML_SCHEMAS_QUALIF_ELEM;

    if (schema->flags & XML_SCHEMAS_QUALIF_ATTR)
        schema->flags ^= XML_SCHEMAS_QUALIF_ATTR;

    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_EXTENSION)
        schema->flags ^= XML_SCHEMAS_FINAL_DEFAULT_EXTENSION;
    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION)
        schema->flags ^= XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION;
    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_LIST)
        schema->flags ^= XML_SCHEMAS_FINAL_DEFAULT_LIST;
    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_UNION)
        schema->flags ^= XML_SCHEMAS_FINAL_DEFAULT_UNION;

    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION)
        schema->flags ^= XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION;
    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION)
        schema->flags ^= XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION;
    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION)
        schema->flags ^= XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION;
}

static int
xmlSchemaParseSchemaElement(xmlSchemaParserCtxtPtr ctxt,
                             xmlSchemaPtr schema,
                             xmlNodePtr node)
{
    xmlAttrPtr attr;
    const xmlChar *val;
    int res = 0, oldErrs = ctxt->nberrors;

    /*
    * Those flags should be moved to the parser context flags,
    * since they are not visible at the component level. I.e.
    * they are used if processing schema *documents* only.
    */
    res = xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    HFAILURE;

    /*
    * Since the version is of type xs:token, we won't bother to
    * check it.
    */
    /* REMOVED:
    attr = xmlSchemaGetPropNode(node, "version");
    if (attr != NULL) {
        res = xmlSchemaPValAttrNode(ctxt, NULL, NULL, attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_TOKEN), &val);    
        HFAILURE;
    }
    */
    attr = xmlSchemaGetPropNode(node, "targetNamespace");
    if (attr != NULL) {
        res = xmlSchemaPValAttrNode(ctxt, NULL, attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI), NULL);
        HFAILURE;
        if (res != 0) {
            ctxt->stop = XML_SCHEMAP_S4S_ATTR_INVALID_VALUE;
            goto exit;
        }
    }
    attr = xmlSchemaGetPropNode(node, "elementFormDefault");
    if (attr != NULL) {
        val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
        res = xmlSchemaPValAttrFormDefault(val, &schema->flags,
            XML_SCHEMAS_QUALIF_ELEM);
        HFAILURE;
        if (res != 0) {
            xmlSchemaPSimpleTypeErr(ctxt,
                XML_SCHEMAP_ELEMFORMDEFAULT_VALUE,
                NULL, (xmlNodePtr) attr, NULL,
                "(qualified | unqualified)", val, NULL, NULL, NULL);
        }
    }
    attr = xmlSchemaGetPropNode(node, "attributeFormDefault");
    if (attr != NULL) {
        val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
        res = xmlSchemaPValAttrFormDefault(val, &schema->flags,
            XML_SCHEMAS_QUALIF_ATTR);
        HFAILURE;
        if (res != 0) {
            xmlSchemaPSimpleTypeErr(ctxt,
                XML_SCHEMAP_ATTRFORMDEFAULT_VALUE,
                NULL, (xmlNodePtr) attr, NULL,
                "(qualified | unqualified)", val, NULL, NULL, NULL);
        }
    }
    attr = xmlSchemaGetPropNode(node, "finalDefault");
    if (attr != NULL) {
        val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
        res = xmlSchemaPValAttrBlockFinal(val, &(schema->flags), -1,
            XML_SCHEMAS_FINAL_DEFAULT_EXTENSION,
            XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION,
            -1,
            XML_SCHEMAS_FINAL_DEFAULT_LIST,
            XML_SCHEMAS_FINAL_DEFAULT_UNION);
        HFAILURE;
        if (res != 0) {
            xmlSchemaPSimpleTypeErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                NULL, (xmlNodePtr) attr, NULL,
                "(#all | List of (extension | restriction | list | union))",
                val, NULL, NULL, NULL);
        }
    }
    attr = xmlSchemaGetPropNode(node, "blockDefault");
    if (attr != NULL) {
        val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr); 
        res = xmlSchemaPValAttrBlockFinal(val, &(schema->flags), -1,
            XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION,
            XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION,
            XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION, -1, -1);
        HFAILURE;
        if (res != 0) {
            xmlSchemaPSimpleTypeErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                NULL, (xmlNodePtr) attr, NULL,
                "(#all | List of (extension | restriction | substitution))",
                val, NULL, NULL, NULL);
        }
    }

exit:
    if (oldErrs != ctxt->nberrors)
        res = ctxt->err;
    return(res);
exit_failure:
    return(-1);
}

/**
 * xmlSchemaParseSchemaTopLevel:
 * @ctxt:  a schema validation context
 * @schema:  the schemas
 * @nodes:  the list of top level nodes
 *
 * Returns the internal XML Schema structure built from the resource or
 *         NULL in case of error
 */
static int
xmlSchemaParseSchemaTopLevel(xmlSchemaParserCtxtPtr ctxt,
                             xmlSchemaPtr schema, xmlNodePtr nodes)
{
    xmlNodePtr child;
    xmlSchemaAnnotPtr annot;
    int res = 0, oldErrs, tmpOldErrs;

    if ((ctxt == NULL) || (schema == NULL) || (nodes == NULL))
        return(-1);

    oldErrs = ctxt->nberrors;
    child = nodes;
    while ((IS_SCHEMA(child, "include")) ||
           (IS_SCHEMA(child, "import")) ||
           (IS_SCHEMA(child, "redefine")) ||
           (IS_SCHEMA(child, "annotation"))) {
        if (IS_SCHEMA(child, "annotation")) {
            annot = xmlSchemaParseAnnotation(ctxt, child, 1);
            if (schema->annot == NULL)
                schema->annot = annot;
            else
                xmlSchemaFreeAnnot(annot);
        } else if (IS_SCHEMA(child, "import")) {
            tmpOldErrs = ctxt->nberrors;
            res = xmlSchemaParseImport(ctxt, schema, child);
            HFAILURE;
            HSTOP(ctxt);
            if (tmpOldErrs != ctxt->nberrors)
                goto exit;          
        } else if (IS_SCHEMA(child, "include")) {
            tmpOldErrs = ctxt->nberrors;
            res = xmlSchemaParseInclude(ctxt, schema, child);
            HFAILURE;
            HSTOP(ctxt);
            if (tmpOldErrs != ctxt->nberrors)
                goto exit;          
        } else if (IS_SCHEMA(child, "redefine")) {
            tmpOldErrs = ctxt->nberrors;
            res = xmlSchemaParseRedefine(ctxt, schema, child);
            HFAILURE;
            HSTOP(ctxt);
            if (tmpOldErrs != ctxt->nberrors)
                goto exit;
        }
        child = child->next;
    }
    /*
    * URGENT TODO: Change the functions to return int results.
    * We need especially to catch internal errors.
    */
    while (child != NULL) {
        if (IS_SCHEMA(child, "complexType")) {
            xmlSchemaParseComplexType(ctxt, schema, child, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "simpleType")) {
            xmlSchemaParseSimpleType(ctxt, schema, child, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "element")) {
            xmlSchemaParseElement(ctxt, schema, child, NULL, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "attribute")) {
            xmlSchemaParseGlobalAttribute(ctxt, schema, child);
            child = child->next;
        } else if (IS_SCHEMA(child, "attributeGroup")) {
            xmlSchemaParseAttributeGroupDefinition(ctxt, schema, child);
            child = child->next;
        } else if (IS_SCHEMA(child, "group")) {
            xmlSchemaParseModelGroupDefinition(ctxt, schema, child);
            child = child->next;
        } else if (IS_SCHEMA(child, "notation")) {
            xmlSchemaParseNotation(ctxt, schema, child);
            child = child->next;
        } else {
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, child->parent, child,
                NULL, "((include | import | redefine | annotation)*, "
                "(((simpleType | complexType | group | attributeGroup) "
                "| element | attribute | notation), annotation*)*)");
            child = child->next;
        }
        while (IS_SCHEMA(child, "annotation")) {
            /*
            * TODO: We should add all annotations.
            */
            annot = xmlSchemaParseAnnotation(ctxt, child, 1);
            if (schema->annot == NULL)
                schema->annot = annot;
            else
                xmlSchemaFreeAnnot(annot);
            child = child->next;
        }
    }
exit:
    ctxt->ctxtType = NULL;
    if (oldErrs != ctxt->nberrors)
        res = ctxt->err;
    return(res);
exit_failure:
    return(-1);
}

static xmlSchemaSchemaRelationPtr
xmlSchemaSchemaRelationCreate(void)
{
    xmlSchemaSchemaRelationPtr ret;

    ret = (xmlSchemaSchemaRelationPtr)
        xmlMalloc(sizeof(xmlSchemaSchemaRelation));
    if (ret == NULL) {
        xmlSchemaPErrMemory(NULL, "allocating schema relation", NULL);
        return(NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaSchemaRelation));
    return(ret);
}

#if 0
static void
xmlSchemaSchemaRelationFree(xmlSchemaSchemaRelationPtr rel)
{
    xmlFree(rel);
}
#endif

static void
xmlSchemaRedefListFree(xmlSchemaRedefPtr redef)
{
    xmlSchemaRedefPtr prev;

    while (redef != NULL) {
        prev = redef;
        redef = redef->next;
        xmlFree(prev);
    }
}

static void
xmlSchemaConstructionCtxtFree(xmlSchemaConstructionCtxtPtr con)
{
    /*
    * After the construction context has been freed, there will be
    * no schema graph available any more. Only the schema buckets
    * will stay alive, which are put into the "schemasImports" and
    * "includes" slots of the xmlSchema.
    */
    if (con->buckets != NULL)
        xmlSchemaItemListFree(con->buckets);
    if (con->pending != NULL)
        xmlSchemaItemListFree(con->pending);
    if (con->substGroups != NULL)
        xmlHashFree(con->substGroups,
            (xmlHashDeallocator) xmlSchemaSubstGroupFree);
    if (con->redefs != NULL)
        xmlSchemaRedefListFree(con->redefs);
    if (con->dict != NULL)
        xmlDictFree(con->dict);
    xmlFree(con);
}

static xmlSchemaConstructionCtxtPtr 
xmlSchemaConstructionCtxtCreate(xmlDictPtr dict)
{
    xmlSchemaConstructionCtxtPtr ret;

    ret = (xmlSchemaConstructionCtxtPtr)
        xmlMalloc(sizeof(xmlSchemaConstructionCtxt));
    if (ret == NULL) {
        xmlSchemaPErrMemory(NULL,
            "allocating schema construction context", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaConstructionCtxt));

    ret->buckets = xmlSchemaItemListCreate();
    if (ret->buckets == NULL) {
        xmlSchemaPErrMemory(NULL,
            "allocating list of schema buckets", NULL);
        xmlFree(ret);
        return (NULL);
    }
    ret->pending = xmlSchemaItemListCreate();
    if (ret->pending == NULL) {
        xmlSchemaPErrMemory(NULL,
            "allocating list of pending global components", NULL);
        xmlSchemaConstructionCtxtFree(ret);
        return (NULL);
    }
    ret->dict = dict;
    xmlDictReference(dict);
    return(ret);
}

static xmlSchemaParserCtxtPtr
xmlSchemaParserCtxtCreate(void)
{
    xmlSchemaParserCtxtPtr ret;

    ret = (xmlSchemaParserCtxtPtr) xmlMalloc(sizeof(xmlSchemaParserCtxt));
    if (ret == NULL) {
        xmlSchemaPErrMemory(NULL, "allocating schema parser context",
                            NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaParserCtxt));
    ret->type = XML_SCHEMA_CTXT_PARSER;
    ret->attrProhibs = xmlSchemaItemListCreate();
    if (ret->attrProhibs == NULL) {
        xmlFree(ret);
        return(NULL);
    }
    return(ret);
}

/**
 * xmlSchemaNewParserCtxtUseDict:
 * @URL:  the location of the schema
 * @dict: the dictionary to be used
 *
 * Create an XML Schemas parse context for that file/resource expected
 * to contain an XML Schemas file.
 *
 * Returns the parser context or NULL in case of error
 */
static xmlSchemaParserCtxtPtr
xmlSchemaNewParserCtxtUseDict(const char *URL, xmlDictPtr dict)
{
    xmlSchemaParserCtxtPtr ret;

    ret = xmlSchemaParserCtxtCreate();
    if (ret == NULL)        
        return (NULL);
    ret->dict = dict;
    xmlDictReference(dict);    
    if (URL != NULL)
        ret->URL = xmlDictLookup(dict, (const xmlChar *) URL, -1);
    return (ret);
}

static int
xmlSchemaCreatePCtxtOnVCtxt(xmlSchemaValidCtxtPtr vctxt)
{
    if (vctxt->pctxt == NULL) {
        if (vctxt->schema != NULL)
            vctxt->pctxt =
                xmlSchemaNewParserCtxtUseDict("*", vctxt->schema->dict);
        else
            vctxt->pctxt = xmlSchemaNewParserCtxt("*");
        if (vctxt->pctxt == NULL) {
            VERROR_INT("xmlSchemaCreatePCtxtOnVCtxt",
                "failed to create a temp. parser context");
            return (-1);
        }
        /* TODO: Pass user data. */
        xmlSchemaSetParserErrors(vctxt->pctxt, vctxt->error,
            vctxt->warning, vctxt->errCtxt);
        xmlSchemaSetParserStructuredErrors(vctxt->pctxt, vctxt->serror,
            vctxt->errCtxt);
    }
    return (0);
}

/**
 * xmlSchemaGetSchemaBucket:
 * @pctxt: the schema parser context
 * @schemaLocation: the URI of the schema document
 *
 * Returns a schema bucket if it was already parsed.
 *
 * Returns a schema bucket if it was already parsed from
 *         @schemaLocation, NULL otherwise.
 */
static xmlSchemaBucketPtr
xmlSchemaGetSchemaBucket(xmlSchemaParserCtxtPtr pctxt,
                            const xmlChar *schemaLocation)
{
    xmlSchemaBucketPtr cur;
    xmlSchemaItemListPtr list;

    list = pctxt->constructor->buckets;
    if (list->nbItems == 0)
        return(NULL);
    else {
        int i;
        for (i = 0; i < list->nbItems; i++) {
            cur = (xmlSchemaBucketPtr) list->items[i];
            /* Pointer comparison! */
            if (cur->schemaLocation == schemaLocation)
                return(cur);
        }
    }
    return(NULL);
}

static xmlSchemaBucketPtr
xmlSchemaGetChameleonSchemaBucket(xmlSchemaParserCtxtPtr pctxt,
                                     const xmlChar *schemaLocation,
                                     const xmlChar *targetNamespace)
{
    xmlSchemaBucketPtr cur;
    xmlSchemaItemListPtr list;

    list = pctxt->constructor->buckets;
    if (list->nbItems == 0)
        return(NULL);
    else {
        int i;
        for (i = 0; i < list->nbItems; i++) {
            cur = (xmlSchemaBucketPtr) list->items[i];
            /* Pointer comparison! */
            if ((cur->origTargetNamespace == NULL) &&
                (cur->schemaLocation == schemaLocation) &&
                (cur->targetNamespace == targetNamespace))
                return(cur);
        }
    }
    return(NULL);
}


#define IS_BAD_SCHEMA_DOC(b) \
    (((b)->doc == NULL) && ((b)->schemaLocation != NULL))

static xmlSchemaBucketPtr
xmlSchemaGetSchemaBucketByTNS(xmlSchemaParserCtxtPtr pctxt,
                                 const xmlChar *targetNamespace,
                                 int imported)
{
    xmlSchemaBucketPtr cur;
    xmlSchemaItemListPtr list;

    list = pctxt->constructor->buckets;
    if (list->nbItems == 0)
        return(NULL);
    else {
        int i;
        for (i = 0; i < list->nbItems; i++) {
            cur = (xmlSchemaBucketPtr) list->items[i];
            if ((! IS_BAD_SCHEMA_DOC(cur)) &&
                (cur->origTargetNamespace == targetNamespace) &&
                ((imported && cur->imported) ||
                 ((!imported) && (!cur->imported))))
                return(cur);
        }
    }
    return(NULL);
}

static int
xmlSchemaParseNewDocWithContext(xmlSchemaParserCtxtPtr pctxt,
                     xmlSchemaPtr schema,
                     xmlSchemaBucketPtr bucket)
{
    int oldFlags;
    xmlDocPtr oldDoc;
    xmlNodePtr node;
    int ret, oldErrs;
    xmlSchemaBucketPtr oldbucket = pctxt->constructor->bucket;
    
    /* 
    * Save old values; reset the *main* schema.
    * URGENT TODO: This is not good; move the per-document information
    * to the parser. Get rid of passing the main schema to the
    * parsing functions.
    */
    oldFlags = schema->flags;
    oldDoc = schema->doc;
    if (schema->flags != 0)
        xmlSchemaClearSchemaDefaults(schema);
    schema->doc = bucket->doc;    
    pctxt->schema = schema;
    /* 
    * Keep the current target namespace on the parser *not* on the
    * main schema.
    */
    pctxt->targetNamespace = bucket->targetNamespace;
    WXS_CONSTRUCTOR(pctxt)->bucket = bucket;

    if ((bucket->targetNamespace != NULL) &&
        xmlStrEqual(bucket->targetNamespace, xmlSchemaNs)) {
        /*
        * We are parsing the schema for schemas!
        */
        pctxt->isS4S = 1;
    }    
    /* Mark it as parsed, even if parsing fails. */
    bucket->parsed++;
    /* Compile the schema doc. */
    node = xmlDocGetRootElement(bucket->doc);
    ret = xmlSchemaParseSchemaElement(pctxt, schema, node);
    if (ret != 0)
        goto exit;
    /* An empty schema; just get out. */
    if (node->children == NULL)
        goto exit;
    oldErrs = pctxt->nberrors;
    ret = xmlSchemaParseSchemaTopLevel(pctxt, schema, node->children);
    if (ret != 0)
        goto exit;
    /*
    * TODO: Not nice, but I'm not 100% sure we will get always an error
    * as a result of the obove functions; so better rely on pctxt->err
    * as well.
    */
    if ((ret == 0) && (oldErrs != pctxt->nberrors)) {
        ret = pctxt->err;
        goto exit;
    }
    
exit:
    WXS_CONSTRUCTOR(pctxt)->bucket = oldbucket;
    /* Restore schema values. */
    schema->doc = oldDoc;
    schema->flags = oldFlags;
    return(ret);
}

static int
xmlSchemaParseNewDoc(xmlSchemaParserCtxtPtr pctxt,
                     xmlSchemaPtr schema,
                     xmlSchemaBucketPtr bucket)
{
    xmlSchemaParserCtxtPtr newpctxt;
    int res = 0;

    if (bucket == NULL)
        return(0);
    if (bucket->parsed) {
        PERROR_INT("xmlSchemaParseNewDoc",
            "reparsing a schema doc");
        return(-1);
    }
    if (bucket->doc == NULL) {
        PERROR_INT("xmlSchemaParseNewDoc",
            "parsing a schema doc, but there's no doc");
        return(-1);
    }
    if (pctxt->constructor == NULL) {
        PERROR_INT("xmlSchemaParseNewDoc",
            "no constructor");
        return(-1);
    }    
    /* Create and init the temporary parser context. */
    newpctxt = xmlSchemaNewParserCtxtUseDict(
        (const char *) bucket->schemaLocation, pctxt->dict);
    if (newpctxt == NULL)
        return(-1);
    newpctxt->constructor = pctxt->constructor;
    /*
    * TODO: Can we avoid that the parser knows about the main schema? 
    * It would be better if he knows about the current schema bucket
    * only.
    */
    newpctxt->schema = schema;
    xmlSchemaSetParserErrors(newpctxt, pctxt->error, pctxt->warning,
        pctxt->errCtxt);
    xmlSchemaSetParserStructuredErrors(newpctxt, pctxt->serror,
        pctxt->errCtxt);
    newpctxt->counter = pctxt->counter;
    

    res = xmlSchemaParseNewDocWithContext(newpctxt, schema, bucket);
    
    /* Channel back errors and cleanup the temporary parser context. */
    if (res != 0)
        pctxt->err = res;
    pctxt->nberrors += newpctxt->nberrors;
    pctxt->counter = newpctxt->counter;
    newpctxt->constructor = NULL;    
    /* Free the parser context. */
    xmlSchemaFreeParserCtxt(newpctxt);
    return(res);
}

static void
xmlSchemaSchemaRelationAddChild(xmlSchemaBucketPtr bucket,
                                xmlSchemaSchemaRelationPtr rel)
{
    xmlSchemaSchemaRelationPtr cur = bucket->relations;

    if (cur == NULL) {
        bucket->relations = rel;
        return;
    }
    while (cur->next != NULL)
        cur = cur->next;
    cur->next = rel;
}


static const xmlChar *
xmlSchemaBuildAbsoluteURI(xmlDictPtr dict, const xmlChar* location,
                          xmlNodePtr ctxtNode)
{    
    /*
    * Build an absolue location URI.
    */
    if (location != NULL) {     
        if (ctxtNode == NULL)
            return(location);
        else {
            xmlChar *base, *URI;
            const xmlChar *ret = NULL;

            base = xmlNodeGetBase(ctxtNode->doc, ctxtNode);
            if (base == NULL) {
                URI = xmlBuildURI(location, ctxtNode->doc->URL);
            } else {
                URI = xmlBuildURI(location, base);
                xmlFree(base);
            }
            if (URI != NULL) {
                ret = xmlDictLookup(dict, URI, -1);
                xmlFree(URI);
                return(ret);
            }
        }
    }
    return(NULL);
}
    


/**
 * xmlSchemaAddSchemaDoc:
 * @pctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parse an included (and to-be-redefined) XML schema document.
 *
 * Returns 0 on success, a positive error code on errors and
 *         -1 in case of an internal or API error.
 */

static int
xmlSchemaAddSchemaDoc(xmlSchemaParserCtxtPtr pctxt,
                int type, /* import or include or redefine */
                const xmlChar *schemaLocation,
                xmlDocPtr schemaDoc,
                const char *schemaBuffer,
                int schemaBufferLen,
                xmlNodePtr invokingNode,
                const xmlChar *sourceTargetNamespace,           
                const xmlChar *importNamespace, 
                xmlSchemaBucketPtr *bucket)
{
    const xmlChar *targetNamespace = NULL;
    xmlSchemaSchemaRelationPtr relation = NULL;
    xmlDocPtr doc = NULL;
    int res = 0, err = 0, located = 0, preserveDoc = 0;
    xmlSchemaBucketPtr bkt = NULL;

    if (bucket != NULL)
        *bucket = NULL;
    
    switch (type) {
        case XML_SCHEMA_SCHEMA_IMPORT:
        case XML_SCHEMA_SCHEMA_MAIN:
            err = XML_SCHEMAP_SRC_IMPORT;
            break;
        case XML_SCHEMA_SCHEMA_INCLUDE:
            err = XML_SCHEMAP_SRC_INCLUDE;
            break;
        case XML_SCHEMA_SCHEMA_REDEFINE:
            err = XML_SCHEMAP_SRC_REDEFINE;
            break;
    }    
       

    /* Special handling for the main schema:
    * skip the location and relation logic and just parse the doc.
    * We need just a bucket to be returned in this case.
    */    
    if ((type == XML_SCHEMA_SCHEMA_MAIN) || (! WXS_HAS_BUCKETS(pctxt)))
        goto doc_load;  

    /* Note that we expect the location to be an absulute URI. */ 
    if (schemaLocation != NULL) {
        bkt = xmlSchemaGetSchemaBucket(pctxt, schemaLocation);
        if ((bkt != NULL) &&
            (pctxt->constructor->bucket == bkt)) {
            /* Report self-imports/inclusions/redefinitions. */
            
            xmlSchemaCustomErr(ACTXT_CAST pctxt, err,
                invokingNode, NULL,
                "The schema must not import/include/redefine itself",
                NULL, NULL);
            goto exit;
        }
    }
    /*
    * Create a relation for the graph of schemas.
    */
    relation = xmlSchemaSchemaRelationCreate();
    if (relation == NULL)
        return(-1);    
    xmlSchemaSchemaRelationAddChild(pctxt->constructor->bucket,
        relation);
    relation->type = type;

    /*
    * Save the namespace import information.
    */
    if (WXS_IS_BUCKET_IMPMAIN(type)) {
        relation->importNamespace = importNamespace;    
        if (schemaLocation == NULL) {
            /*
            * No location; this is just an import of the namespace.
            * Note that we don't assign a bucket to the relation
            * in this case.
            */
            goto exit;
        }
        targetNamespace = importNamespace;
    }

    /* Did we already fetch the doc? */
    if (bkt != NULL) {          
        /* TODO: The following nasty cases will produce an error. */
        if ((WXS_IS_BUCKET_IMPMAIN(type)) && (! bkt->imported)) {
            /* We included/redefined and then try to import a schema. */
            xmlSchemaCustomErr(ACTXT_CAST pctxt, err,
                invokingNode, NULL,
                "The schema document '%s' cannot be imported, since "
                "it was already included or redefined",
                schemaLocation, NULL);
            goto exit;
        } else if ((! WXS_IS_BUCKET_IMPMAIN(type)) && (bkt->imported)) {
            /* We imported and then try to include/redefine a schema. */
            xmlSchemaCustomErr(ACTXT_CAST pctxt, err,
                invokingNode, NULL,
                "The schema document '%s' cannot be included or "
                "redefined, since it was already imported",
                schemaLocation, NULL);
            goto exit;
        }       
    }
        
    if (WXS_IS_BUCKET_IMPMAIN(type)) {
        /*
        * Given that the schemaLocation [attribute] is only a hint, it is open
        * to applications to ignore all but the first <import> for a given
        * namespace, regardless of the ·actual value· of schemaLocation, but
        * such a strategy risks missing useful information when new
        * schemaLocations are offered.
        *
        * We will use the first <import> that comes with a location.
        * Further <import>s *with* a location, will result in an error.
        * TODO: Better would be to just report a warning here, but
        * we'll try it this way until someone complains.
        *
        * Schema Document Location Strategy:
        * 3 Based on the namespace name, identify an existing schema document,
        * either as a resource which is an XML document or a <schema> element
        * information item, in some local schema repository;
        * 5 Attempt to resolve the namespace name to locate such a resource.
        *
        * NOTE: (3) and (5) are not supported.
        */      
        if (bkt != NULL) {
            relation->bucket = bkt;
            goto exit;
        }
        bkt = xmlSchemaGetSchemaBucketByTNS(pctxt,
            importNamespace, 1);

        if (bkt != NULL) {          
            relation->bucket = bkt;
            if (bkt->schemaLocation == NULL) {
                /* First given location of the schema; load the doc. */
                bkt->schemaLocation = schemaLocation;
            } else {
                if (!xmlStrEqual(schemaLocation,
                    bkt->schemaLocation)) {
                    /*
                    * Additional location given; just skip it.
                    * URGENT TODO: We should report a warning here.
                    * res = XML_SCHEMAP_SRC_IMPORT;
                    */
                    xmlSchemaCustomWarning(ACTXT_CAST pctxt,
                        XML_SCHEMAP_WARN_SKIP_SCHEMA,
                        invokingNode, NULL,
                        "Skipping import of schema located at '%s' for the "
                        "namespace '%s', since this namespace was already "
                        "imported with the schema located at '%s'",
                        schemaLocation, importNamespace, bkt->schemaLocation);
                }
                goto exit;
            }
        }       
        /* 
        * No bucket + first location: load the doc and create a
        * bucket.
        */
    } else {
        /* <include> and <redefine> */
        if (bkt != NULL) {
                    
            if ((bkt->origTargetNamespace == NULL) &&
                (bkt->targetNamespace != sourceTargetNamespace)) {
                xmlSchemaBucketPtr chamel;
                
                /*
                * Chameleon include/redefine: skip loading only if it was
                * aleady build for the targetNamespace of the including
                * schema.
                */
                /*
                * URGENT TODO: If the schema is a chameleon-include then copy
                * the components into the including schema and modify the
                * targetNamespace of those components, do nothing otherwise.
                * NOTE: This is currently worked-around by compiling the
                * chameleon for every destinct including targetNamespace; thus
                * not performant at the moment.
                * TODO: Check when the namespace in wildcards for chameleons
                * needs to be converted: before we built wildcard intersections
                * or after.
                *   Answer: after!
                */
                chamel = xmlSchemaGetChameleonSchemaBucket(pctxt,
                    schemaLocation, sourceTargetNamespace);
                if (chamel != NULL) {
                    /* A fitting chameleon was already parsed; NOP. */
                    relation->bucket = chamel;
                    goto exit;
                }
                /* 
                * We need to parse the chameleon again for a different
                * targetNamespace.
                * CHAMELEON TODO: Optimize this by only parsing the
                * chameleon once, and then copying the components to
                * the new targetNamespace.
                */
                bkt = NULL;
            } else {
                relation->bucket = bkt;
                goto exit;
            }       
        }
    }
    if ((bkt != NULL) && (bkt->doc != NULL)) {
        PERROR_INT("xmlSchemaAddSchemaDoc",
            "trying to load a schema doc, but a doc is already "
            "assigned to the schema bucket");
        goto exit_failure;
    }

doc_load:
    /*
    * Load the document.
    */
    if (schemaDoc != NULL) {
        doc = schemaDoc;
        /* Don' free this one, since it was provided by the caller. */
        preserveDoc = 1;
        /* TODO: Does the context or the doc hold the location? */
        if (schemaDoc->URL != NULL)
            schemaLocation = xmlDictLookup(pctxt->dict,
                schemaDoc->URL, -1);

    } else if ((schemaLocation != NULL) || (schemaBuffer != NULL)) {
        xmlParserCtxtPtr parserCtxt;

        parserCtxt = xmlNewParserCtxt();
        if (parserCtxt == NULL) {
            xmlSchemaPErrMemory(NULL, "xmlSchemaGetDoc, "
                "allocating a parser context", NULL);
            goto exit_failure;
        }
        if ((pctxt->dict != NULL) && (parserCtxt->dict != NULL)) {
            /*
            * TODO: Do we have to burden the schema parser dict with all
            * the content of the schema doc?
            */
            xmlDictFree(parserCtxt->dict);
            parserCtxt->dict = pctxt->dict;
            xmlDictReference(parserCtxt->dict);
        }
        if (schemaLocation != NULL) {
            /* Parse from file. */
            doc = xmlCtxtReadFile(parserCtxt, (const char *) schemaLocation,
                NULL, SCHEMAS_PARSE_OPTIONS);
        } else if (schemaBuffer != NULL) {
            /* Parse from memory buffer. */
            doc = xmlCtxtReadMemory(parserCtxt, schemaBuffer, schemaBufferLen,
                NULL, NULL, SCHEMAS_PARSE_OPTIONS);
            schemaLocation = xmlStrdup(BAD_CAST "in_memory_buffer");
            if (doc != NULL)
                doc->URL = schemaLocation;          
        }
        /*
        * For <import>:
        * 2.1 The referent is (a fragment of) a resource which is an
        * XML document (see clause 1.1), which in turn corresponds to
        * a <schema> element information item in a well-formed information
        * set, which in turn corresponds to a valid schema.
        * TODO: (2.1) fragments of XML documents are not supported.
        *
        * 2.2 The referent is a <schema> element information item in
        * a well-formed information set, which in turn corresponds
        * to a valid schema.
        * TODO: (2.2) is not supported.
        */
        if (doc == NULL) {
            xmlErrorPtr lerr;
            lerr = xmlGetLastError();
            /*
            * Check if this a parser error, or if the document could
            * just not be located.
            * TODO: Try to find specific error codes to react only on
            * localisation failures.
            */
            if ((lerr == NULL) || (lerr->domain != XML_FROM_IO)) {
                /*
                * We assume a parser error here.
                */
                located = 1;
                /* TODO: Error code ?? */
                res = XML_SCHEMAP_SRC_IMPORT_2_1;
                xmlSchemaCustomErr(ACTXT_CAST pctxt, res,
                    invokingNode, NULL,
                    "Failed to parse the XML resource '%s'",
                    schemaLocation, NULL);              
            }
        }
        xmlFreeParserCtxt(parserCtxt);
        if ((doc == NULL) && located)
            goto exit_error;
    } else {
        xmlSchemaPErr(pctxt, NULL,
            XML_SCHEMAP_NOTHING_TO_PARSE,
            "No information for parsing was provided with the "
            "given schema parser context.\n",
            NULL, NULL);
        goto exit_failure;
    }
    /*
    * Preprocess the document.
    */
    if (doc != NULL) {
        xmlNodePtr docElem = NULL;

        located = 1;    
        docElem = xmlDocGetRootElement(doc);
        if (docElem == NULL) {
            xmlSchemaCustomErr(ACTXT_CAST pctxt, XML_SCHEMAP_NOROOT,
                invokingNode, NULL, 
                "The document '%s' has no document element",
                schemaLocation, NULL);
            goto exit_error;
        }
        /*
        * Remove all the blank text nodes.
        */
        xmlSchemaCleanupDoc(pctxt, docElem);
        /*
        * Check the schema's top level element.
        */
        if (!IS_SCHEMA(docElem, "schema")) {
            xmlSchemaCustomErr(ACTXT_CAST pctxt, XML_SCHEMAP_NOT_SCHEMA,
                invokingNode, NULL,
                "The XML document '%s' is not a schema document",
                schemaLocation, NULL);
            goto exit_error;
        }
        /* 
        * Note that we don't apply a type check for the
        * targetNamespace value here.
        */
        targetNamespace = xmlSchemaGetProp(pctxt, docElem,
            "targetNamespace");
    }
    
/* after_doc_loading: */
    if ((bkt == NULL) && located) {
        /* Only create a bucket if the schema was located. */
        bkt = xmlSchemaBucketCreate(pctxt, type,
            targetNamespace);
        if (bkt == NULL)
            goto exit_failure;
    }
    if (bkt != NULL) {
        bkt->schemaLocation = schemaLocation;
        bkt->located = located;
        if (doc != NULL) {
            bkt->doc = doc;
            bkt->targetNamespace = targetNamespace;
            bkt->origTargetNamespace = targetNamespace;
            if (preserveDoc)
                bkt->preserveDoc = 1;
        }
        if (WXS_IS_BUCKET_IMPMAIN(type))
            bkt->imported++;
            /*
            * Add it to the graph of schemas.
            */
        if (relation != NULL)
            relation->bucket = bkt;
    }
  
exit:
    /*
    * Return the bucket explicitly; this is needed for the
    * main schema.
    */
    if (bucket != NULL)
        *bucket = bkt;    
    return (0);

exit_error:
    if ((doc != NULL) && (! preserveDoc)) {
        xmlFreeDoc(doc);
        if (bkt != NULL)
            bkt->doc = NULL;
    }
    return(pctxt->err);

exit_failure:
    if ((doc != NULL) && (! preserveDoc)) {
        xmlFreeDoc(doc);
        if (bkt != NULL)
            bkt->doc = NULL;
    }    
    return (-1);
}

/**
 * xmlSchemaParseImport:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Import definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns 0 in case of success, a positive error code if
 * not valid and -1 in case of an internal error.
 */
static int
xmlSchemaParseImport(xmlSchemaParserCtxtPtr pctxt, xmlSchemaPtr schema,
                     xmlNodePtr node)
{
    xmlNodePtr child;
    const xmlChar *namespaceName = NULL, *schemaLocation = NULL;
    const xmlChar *thisTargetNamespace;
    xmlAttrPtr attr;
    int ret = 0;
    xmlSchemaBucketPtr bucket = NULL;

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (-1);

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "namespace")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "schemaLocation"))) {
                xmlSchemaPIllegalAttrErr(pctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(pctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    /*
    * Extract and validate attributes.
    */
    if (xmlSchemaPValAttr(pctxt, NULL, node,
        "namespace", xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
        &namespaceName) != 0) {
        xmlSchemaPSimpleTypeErr(pctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            NULL, node,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
            NULL, namespaceName, NULL, NULL, NULL);
        return (pctxt->err);
    }

    if (xmlSchemaPValAttr(pctxt, NULL, node,
        "schemaLocation", xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
        &schemaLocation) != 0) {
        xmlSchemaPSimpleTypeErr(pctxt,
            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
            NULL, node,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
            NULL, namespaceName, NULL, NULL, NULL);
        return (pctxt->err);
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
         * the annotation here is simply discarded ...
         * TODO: really?
         */
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(pctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL,
            "(annotation?)");
    }
    /*
    * Apply additional constraints.
    *
    * Note that it is important to use the original @targetNamespace
    * (or none at all), to rule out imports of schemas _with_ a
    * @targetNamespace if the importing schema is a chameleon schema
    * (with no @targetNamespace).
    */
    thisTargetNamespace = WXS_BUCKET(pctxt)->origTargetNamespace;
    if (namespaceName != NULL) {
        /*
        * 1.1 If the namespace [attribute] is present, then its ·actual value·
        * must not match the ·actual value· of the enclosing <schema>'s
        * targetNamespace [attribute].
        */
        if (xmlStrEqual(thisTargetNamespace, namespaceName)) {
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_SRC_IMPORT_1_1,
                NULL, node,
                "The value of the attribute 'namespace' must not match "
                "the target namespace '%s' of the importing schema",
                thisTargetNamespace);
            return (pctxt->err);
        }
    } else {
        /*
        * 1.2 If the namespace [attribute] is not present, then the enclosing
        * <schema> must have a targetNamespace [attribute].
        */
        if (thisTargetNamespace == NULL) {
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_SRC_IMPORT_1_2,
                NULL, node,
                "The attribute 'namespace' must be existent if "
                "the importing schema has no target namespace",
                NULL);
            return (pctxt->err);
        }
    }
    /*
    * Locate and acquire the schema document.
    */
    if (schemaLocation != NULL)
        schemaLocation = xmlSchemaBuildAbsoluteURI(pctxt->dict,
            schemaLocation, node);
    ret = xmlSchemaAddSchemaDoc(pctxt, XML_SCHEMA_SCHEMA_IMPORT,
        schemaLocation, NULL, NULL, 0, node, thisTargetNamespace,
        namespaceName, &bucket);

    if (ret != 0)
        return(ret);

    /*
    * For <import>: "It is *not* an error for the application
    * schema reference strategy to fail."
    * So just don't parse if no schema document was found.
    * Note that we will get no bucket if the schema could not be
    * located or if there was no schemaLocation.
    */
    if ((bucket == NULL) && (schemaLocation != NULL)) {
        xmlSchemaCustomWarning(ACTXT_CAST pctxt,
            XML_SCHEMAP_WARN_UNLOCATED_SCHEMA,
            node, NULL,
            "Failed to locate a schema at location '%s'. "
            "Skipping the import", schemaLocation, NULL, NULL);
    }
    
    if ((bucket != NULL) && CAN_PARSE_SCHEMA(bucket)) { 
        ret = xmlSchemaParseNewDoc(pctxt, schema, bucket);
    }
    
    return (ret);
}

static int
xmlSchemaParseIncludeOrRedefineAttrs(xmlSchemaParserCtxtPtr pctxt,
                                     xmlSchemaPtr schema,
                                     xmlNodePtr node,
                                     xmlChar **schemaLocation,
                                     int type)
{
    xmlAttrPtr attr;

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL) ||
        (schemaLocation == NULL))
        return (-1);

    *schemaLocation = NULL;
    /*
    * Check for illegal attributes.
    * Applies for both <include> and <redefine>.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "schemaLocation"))) {
                xmlSchemaPIllegalAttrErr(pctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(pctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    xmlSchemaPValAttrID(pctxt, node, BAD_CAST "id");
    /*
    * Preliminary step, extract the URI-Reference and make an URI
    * from the base.
    */
    /*
    * Attribute "schemaLocation" is mandatory.
    */
    attr = xmlSchemaGetPropNode(node, "schemaLocation");
    if (attr != NULL) {
        xmlChar *base = NULL;
        xmlChar *uri = NULL;

        if (xmlSchemaPValAttrNode(pctxt, NULL, attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
            (const xmlChar **) schemaLocation) != 0)
            goto exit_error;
        base = xmlNodeGetBase(node->doc, node);
        if (base == NULL) {
            uri = xmlBuildURI(*schemaLocation, node->doc->URL);
        } else {
            uri = xmlBuildURI(*schemaLocation, base);
            xmlFree(base);
        }
        if (uri == NULL) {
            PERROR_INT("xmlSchemaParseIncludeOrRedefine",
                "could not build an URI from the schemaLocation")
            goto exit_failure;
        }
        (*schemaLocation) = (xmlChar *) xmlDictLookup(pctxt->dict, uri, -1);
        xmlFree(uri);
    } else {
        xmlSchemaPMissingAttrErr(pctxt,
            XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node, "schemaLocation", NULL);
        goto exit_error;
    }
    /*
    * Report self-inclusion and self-redefinition.
    */
    if (xmlStrEqual(*schemaLocation, pctxt->URL)) {
        if (type == XML_SCHEMA_SCHEMA_REDEFINE) {
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_SRC_REDEFINE,
                NULL, node,
                "The schema document '%s' cannot redefine itself.",
                *schemaLocation);           
        } else {
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_SRC_INCLUDE,
                NULL, node,
                "The schema document '%s' cannot include itself.",
                *schemaLocation);
        }
        goto exit_error;
    }
    
    return(0);
exit_error:
    return(pctxt->err);
exit_failure:
    return(-1);
}

static int
xmlSchemaParseIncludeOrRedefine(xmlSchemaParserCtxtPtr pctxt,
                                xmlSchemaPtr schema,
                                xmlNodePtr node,
                                int type)
{
    xmlNodePtr child = NULL;
    const xmlChar *schemaLocation = NULL;
    int res = 0; /* hasRedefinitions = 0 */
    int isChameleon = 0, wasChameleon = 0;
    xmlSchemaBucketPtr bucket = NULL;

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (-1);

    /*
    * Parse attributes. Note that the returned schemaLocation will
    * be already converted to an absolute URI.
    */
    res = xmlSchemaParseIncludeOrRedefineAttrs(pctxt, schema,
        node, (xmlChar **) (&schemaLocation), type);
    if (res != 0)
        return(res);               
    /*
    * Load and add the schema document.
    */
    res = xmlSchemaAddSchemaDoc(pctxt, type, schemaLocation, NULL,
        NULL, 0, node, pctxt->targetNamespace, NULL, &bucket);
    if (res != 0)
        return(res);    
    /*
    * If we get no schema bucket back, then this means that the schema
    * document could not be located or was broken XML or was not
    * a schema document.
    */    
    if ((bucket == NULL) || (bucket->doc == NULL)) {
        if (type == XML_SCHEMA_SCHEMA_INCLUDE) {
            /*
            * WARNING for <include>:
            * We will raise an error if the schema cannot be located
            * for inclusions, since the that was the feedback from the
            * schema people. I.e. the following spec piece will *not* be
            * satisfied:
            * SPEC src-include: "It is not an error for the ·actual value· of the
            * schemaLocation [attribute] to fail to resolve it all, in which
            * case no corresponding inclusion is performed.
            * So do we need a warning report here?"
            */
            res = XML_SCHEMAP_SRC_INCLUDE;
            xmlSchemaCustomErr(ACTXT_CAST pctxt, res,
                node, NULL,
                "Failed to load the document '%s' for inclusion",
                schemaLocation, NULL);
        } else {
            /*
            * NOTE: This was changed to raise an error even if no redefinitions
            * are specified.
            *
            * SPEC src-redefine (1)
            * "If there are any element information items among the [children]
            * other than <annotation> then the ·actual value· of the
            * schemaLocation [attribute] must successfully resolve."
            * TODO: Ask the WG if a the location has always to resolve
            * here as well!
            */
            res = XML_SCHEMAP_SRC_REDEFINE;
            xmlSchemaCustomErr(ACTXT_CAST pctxt, res,
                node, NULL,
                "Failed to load the document '%s' for redefinition",
                schemaLocation, NULL);
        }
    } else {
        /*
        * Check targetNamespace sanity before parsing the new schema.
        * TODO: Note that we won't check further content if the
        * targetNamespace was bad.
        */    
        if (bucket->origTargetNamespace != NULL) {          
            /*
            * SPEC src-include (2.1)
            * "SII has a targetNamespace [attribute], and its ·actual
            * value· is identical to the ·actual value· of the targetNamespace
            * [attribute] of SII’ (which must have such an [attribute])."
            */
            if (pctxt->targetNamespace == NULL) {
                xmlSchemaCustomErr(ACTXT_CAST pctxt,
                    XML_SCHEMAP_SRC_INCLUDE,
                    node, NULL,
                    "The target namespace of the included/redefined schema "
                    "'%s' has to be absent, since the including/redefining "
                    "schema has no target namespace",
                    schemaLocation, NULL);
                goto exit_error;
            } else if (!xmlStrEqual(bucket->origTargetNamespace,
                pctxt->targetNamespace)) {
                /* TODO: Change error function. */
                xmlSchemaPCustomErrExt(pctxt,
                    XML_SCHEMAP_SRC_INCLUDE,
                    NULL, node,
                    "The target namespace '%s' of the included/redefined "
                    "schema '%s' differs from '%s' of the "
                    "including/redefining schema",
                    bucket->origTargetNamespace, schemaLocation,
                    pctxt->targetNamespace);
                goto exit_error;
            }
        } else if (pctxt->targetNamespace != NULL) {        
            /*
            * Chameleons: the original target namespace will
            * differ from the resulting namespace.
            */
            isChameleon = 1;
            if (bucket->parsed &&
                (bucket->targetNamespace != pctxt->targetNamespace)) {
                /*
                * This is a sanity check, I dunno yet if this can happen.
                */
                PERROR_INT("xmlSchemaParseIncludeOrRedefine",
                    "trying to use an already parsed schema for a "
                    "different targetNamespace");
                return(-1);
            }
            bucket->targetNamespace = pctxt->targetNamespace;
        }
    }    
    /*
    * Parse the schema.
    */   
    if (bucket && (!bucket->parsed) && (bucket->doc != NULL)) {
        if (isChameleon) {
            /* TODO: Get rid of this flag on the schema itself. */
            if ((schema->flags & XML_SCHEMAS_INCLUDING_CONVERT_NS) == 0) {
                schema->flags |= XML_SCHEMAS_INCLUDING_CONVERT_NS;
            } else
                wasChameleon = 1;
        }
        xmlSchemaParseNewDoc(pctxt, schema, bucket);
        /* Restore chameleon flag. */
        if (isChameleon && (!wasChameleon))
            schema->flags ^= XML_SCHEMAS_INCLUDING_CONVERT_NS;
    }
    /*
    * And now for the children...
    */
    child = node->children;    
    if (type == XML_SCHEMA_SCHEMA_REDEFINE) {   
        /*
        * Parse (simpleType | complexType | group | attributeGroup))*
        */
        pctxt->redefined = bucket;
        /*
        * How to proceed if the redefined schema was not located?
        */
        pctxt->isRedefine = 1;
        while (IS_SCHEMA(child, "annotation") ||
            IS_SCHEMA(child, "simpleType") ||
            IS_SCHEMA(child, "complexType") ||
            IS_SCHEMA(child, "group") ||
            IS_SCHEMA(child, "attributeGroup")) {
            if (IS_SCHEMA(child, "annotation")) {
                /*
                * TODO: discard or not?
                */
            } else if (IS_SCHEMA(child, "simpleType")) {
                xmlSchemaParseSimpleType(pctxt, schema, child, 1);
            } else if (IS_SCHEMA(child, "complexType")) {
                xmlSchemaParseComplexType(pctxt, schema, child, 1);
                /* hasRedefinitions = 1; */
            } else if (IS_SCHEMA(child, "group")) {             
                /* hasRedefinitions = 1; */
                xmlSchemaParseModelGroupDefinition(pctxt,
                    schema, child);
            } else if (IS_SCHEMA(child, "attributeGroup")) {
                /* hasRedefinitions = 1; */
                xmlSchemaParseAttributeGroupDefinition(pctxt, schema,
                    child);
            }
            child = child->next;
        }
        pctxt->redefined = NULL;
        pctxt->isRedefine = 0;
    } else {
        if (IS_SCHEMA(child, "annotation")) {
            /*
            * TODO: discard or not?
            */
            child = child->next;
        }
    }    
    if (child != NULL) {
        res = XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED;
        if (type == XML_SCHEMA_SCHEMA_REDEFINE) {
            xmlSchemaPContentErr(pctxt, res,
                NULL, node, child, NULL,
                "(annotation | (simpleType | complexType | group | attributeGroup))*");
        } else {
             xmlSchemaPContentErr(pctxt, res,
                NULL, node, child, NULL,
                "(annotation?)");
        }       
    }       
    return(res);

exit_error:
    return(pctxt->err);
}

static int
xmlSchemaParseRedefine(xmlSchemaParserCtxtPtr pctxt, xmlSchemaPtr schema,
                       xmlNodePtr node)
{
    int res;
#ifndef ENABLE_REDEFINE
    TODO
    return(0);
#endif
    res = xmlSchemaParseIncludeOrRedefine(pctxt, schema, node,
        XML_SCHEMA_SCHEMA_REDEFINE);
    if (res != 0)
        return(res);
    return(0);
}

static int
xmlSchemaParseInclude(xmlSchemaParserCtxtPtr pctxt, xmlSchemaPtr schema,
                       xmlNodePtr node)
{
    int res;

    res = xmlSchemaParseIncludeOrRedefine(pctxt, schema, node,
        XML_SCHEMA_SCHEMA_INCLUDE);
    if (res != 0)
        return(res);
    return(0);
}

/**
 * xmlSchemaParseModelGroup:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 * @type: the "compositor" type
 * @particleNeeded: if a a model group with a particle
 *
 * parse a XML schema Sequence definition.
 * Applies parts of:
 *   Schema Representation Constraint:
 *     Redefinition Constraints and Semantics (src-redefine)
 *     (6.1), (6.1.1), (6.1.2)
 *
 *   Schema Component Constraint: 
 *     All Group Limited (cos-all-limited) (2)
 *     TODO: Actually this should go to component-level checks,
 *     but is done here due to performance. Move it to an other layer
 *     is schema construction via an API is implemented.
 *
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 *         1 in case of success.
 */
static xmlSchemaTreeItemPtr
xmlSchemaParseModelGroup(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                         xmlNodePtr node, xmlSchemaTypeType type,
                         int withParticle)
{
    xmlSchemaModelGroupPtr item;
    xmlSchemaParticlePtr particle = NULL;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    int min = 1, max = 1, isElemRef, hasRefs = 0;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    /*
    * Create a model group with the given compositor.
    */
    item = xmlSchemaAddModelGroup(ctxt, schema, type, node);
    if (item == NULL)
        return (NULL);

    if (withParticle) {
        if (type == XML_SCHEMA_TYPE_ALL) {
            min = xmlGetMinOccurs(ctxt, node, 0, 1, 1, "(0 | 1)");
            max = xmlGetMaxOccurs(ctxt, node, 1, 1, 1, "1");
        } else {
            /* choice + sequence */
            min = xmlGetMinOccurs(ctxt, node, 0, -1, 1, "xs:nonNegativeInteger");
            max = xmlGetMaxOccurs(ctxt, node, 0, UNBOUNDED, 1,
                "(xs:nonNegativeInteger | unbounded)");
        }
        xmlSchemaPCheckParticleCorrect_2(ctxt, NULL, node, min, max);
        /*
        * Create a particle
        */
        particle = xmlSchemaAddParticle(ctxt, node, min, max);
        if (particle == NULL)
            return (NULL);
        particle->children = (xmlSchemaTreeItemPtr) item;
        /*
        * Check for illegal attributes.
        */
        attr = node->properties;
        while (attr != NULL) {
            if (attr->ns == NULL) {
                if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "maxOccurs")) &&
                    (!xmlStrEqual(attr->name, BAD_CAST "minOccurs"))) {
                    xmlSchemaPIllegalAttrErr(ctxt,
                        XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                }
            } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
            attr = attr->next;
        }
    } else {
        /*
        * Check for illegal attributes.
        */
        attr = node->properties;
        while (attr != NULL) {
            if (attr->ns == NULL) {
                if (!xmlStrEqual(attr->name, BAD_CAST "id")) {
                    xmlSchemaPIllegalAttrErr(ctxt,
                        XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                }
            } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
            attr = attr->next;
        }
    }

    /*
    * Extract and validate attributes.
    */
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        item->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (type == XML_SCHEMA_TYPE_ALL) {
        xmlSchemaParticlePtr part, last = NULL;

        while (IS_SCHEMA(child, "element")) {
            part = (xmlSchemaParticlePtr) xmlSchemaParseElement(ctxt,
                schema, child, &isElemRef, 0);
            /*
            * SPEC cos-all-limited (2)
            * "The {max occurs} of all the particles in the {particles}
            * of the ('all') group must be 0 or 1.
            */
            if (part != NULL) {
                if (isElemRef)
                    hasRefs++;
                if (part->minOccurs > 1) {
                    xmlSchemaPCustomErr(ctxt,
                        XML_SCHEMAP_COS_ALL_LIMITED,
                        NULL, child,
                        "Invalid value for minOccurs (must be 0 or 1)",
                        NULL);
                    /* Reset to 1. */
                    part->minOccurs = 1;
                }
                if (part->maxOccurs > 1) {
                    xmlSchemaPCustomErr(ctxt,
                        XML_SCHEMAP_COS_ALL_LIMITED,
                        NULL, child,
                        "Invalid value for maxOccurs (must be 0 or 1)",
                        NULL);
                    /* Reset to 1. */
                    part->maxOccurs = 1;
                }
                if (last == NULL)
                    item->children = (xmlSchemaTreeItemPtr) part;
                else
                    last->next = (xmlSchemaTreeItemPtr) part;
                last = part;
            }
            child = child->next;
        }
        if (child != NULL) {
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "(annotation?, (annotation?, element*)");
        }
    } else {
        /* choice + sequence */
        xmlSchemaTreeItemPtr part = NULL, last = NULL;

        while ((IS_SCHEMA(child, "element")) ||
            (IS_SCHEMA(child, "group")) ||
            (IS_SCHEMA(child, "any")) ||
            (IS_SCHEMA(child, "choice")) ||
            (IS_SCHEMA(child, "sequence"))) {

            if (IS_SCHEMA(child, "element")) {
                part = (xmlSchemaTreeItemPtr)
                    xmlSchemaParseElement(ctxt, schema, child, &isElemRef, 0);
                if (part && isElemRef)
                    hasRefs++;
            } else if (IS_SCHEMA(child, "group")) {
                part =
                    xmlSchemaParseModelGroupDefRef(ctxt, schema, child);
                if (part != NULL)
                    hasRefs++;
                /*
                * Handle redefinitions.
                */
                if (ctxt->isRedefine && ctxt->redef &&
                    (ctxt->redef->item->type == XML_SCHEMA_TYPE_GROUP) &&
                    part && part->children)
                {
                    if ((xmlSchemaGetQNameRefName(part->children) ==
                            ctxt->redef->refName) &&
                        (xmlSchemaGetQNameRefTargetNs(part->children) ==
                            ctxt->redef->refTargetNs))
                    {
                        /*
                        * SPEC src-redefine:
                        * (6.1) "If it has a <group> among its contents at
                        * some level the ·actual value· of whose ref
                        * [attribute] is the same as the ·actual value· of
                        * its own name attribute plus target namespace, then
                        * all of the following must be true:"
                        * (6.1.1) "It must have exactly one such group."
                        */
                        if (ctxt->redefCounter != 0) {
                            xmlChar *str = NULL;

                            xmlSchemaCustomErr(ACTXT_CAST ctxt,
                                XML_SCHEMAP_SRC_REDEFINE, child, NULL,
                                "The redefining model group definition "
                                "'%s' must not contain more than one "
                                "reference to the redefined definition",
                                xmlSchemaFormatQName(&str,
                                    ctxt->redef->refTargetNs,
                                    ctxt->redef->refName),
                                NULL);
                            FREE_AND_NULL(str)
                            part = NULL;
                        } else if (((WXS_PARTICLE(part))->minOccurs != 1) ||
                            ((WXS_PARTICLE(part))->maxOccurs != 1))
                        {
                            xmlChar *str = NULL;
                            /*
                            * SPEC src-redefine:
                            * (6.1.2) "The ·actual value· of both that
                            * group's minOccurs and maxOccurs [attribute]
                            * must be 1 (or ·absent·).
                            */
                            xmlSchemaCustomErr(ACTXT_CAST ctxt,
                                XML_SCHEMAP_SRC_REDEFINE, child, NULL,
                                "The redefining model group definition "
                                "'%s' must not contain a reference to the "
                                "redefined definition with a "
                                "maxOccurs/minOccurs other than 1",
                                xmlSchemaFormatQName(&str,
                                    ctxt->redef->refTargetNs,
                                    ctxt->redef->refName),
                                NULL);
                            FREE_AND_NULL(str)
                            part = NULL;
                        }
                        ctxt->redef->reference = WXS_BASIC_CAST part;
                        ctxt->redefCounter++;
                    }                                      
                }
            } else if (IS_SCHEMA(child, "any")) {
                part = (xmlSchemaTreeItemPtr)
                    xmlSchemaParseAny(ctxt, schema, child);
            } else if (IS_SCHEMA(child, "choice")) {
                part = xmlSchemaParseModelGroup(ctxt, schema, child,
                    XML_SCHEMA_TYPE_CHOICE, 1);
            } else if (IS_SCHEMA(child, "sequence")) {
                part = xmlSchemaParseModelGroup(ctxt, schema, child,
                    XML_SCHEMA_TYPE_SEQUENCE, 1);
            }
            if (part != NULL) {
                if (last == NULL)
                    item->children = part;
                else
                    last->next = part;
                last = part;
            }
            child = child->next;
        }
        if (child != NULL) {
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "(annotation?, (element | group | choice | sequence | any)*)");
        }
    }
    if ((max == 0) && (min == 0))
        return (NULL);
    if (hasRefs) {
        /*
        * We need to resolve references.
        */
        WXS_ADD_PENDING(ctxt, item);
    }
    if (withParticle)
        return ((xmlSchemaTreeItemPtr) particle);       
    else
        return ((xmlSchemaTreeItemPtr) item);
}

/**
 * xmlSchemaParseRestriction:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Restriction definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns the type definition or NULL in case of error
 */
static xmlSchemaTypePtr
xmlSchemaParseRestriction(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                          xmlNodePtr node, xmlSchemaTypeType parentType)
{
    xmlSchemaTypePtr type;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    /* Not a component, don't create it. */
    type = ctxt->ctxtType;
    type->flags |= XML_SCHEMAS_TYPE_DERIVATION_METHOD_RESTRICTION;

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "base"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    /*
    * Extract and validate attributes.
    */
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * Attribute 
    */
    /*
    * Extract the base type. The "base" attribute is mandatory if inside
    * a complex type or if redefining.
    *
    * SPEC (1.2) "...otherwise (<restriction> has no <simpleType> "
    * among its [children]), the simple type definition which is
    * the {content type} of the type definition ·resolved· to by
    * the ·actual value· of the base [attribute]"
    */
    if (xmlSchemaPValAttrQName(ctxt, schema, NULL, node, "base",
        &(type->baseNs), &(type->base)) == 0)
    {
        if ((type->base == NULL) && (type->type == XML_SCHEMA_TYPE_COMPLEX)) {
            xmlSchemaPMissingAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_MISSING,
                NULL, node, "base", NULL);
        } else if ((ctxt->isRedefine) &&
            (type->flags & XML_SCHEMAS_TYPE_GLOBAL))
        {
            if (type->base == NULL) {
                xmlSchemaPMissingAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_MISSING,
                    NULL, node, "base", NULL);
            } else if ((! xmlStrEqual(type->base, type->name)) ||
                (! xmlStrEqual(type->baseNs, type->targetNamespace)))
            {
                xmlChar *str1 = NULL, *str2 = NULL;
                /*
                * REDEFINE: SPEC src-redefine (5)
                * "Within the [children], each <simpleType> must have a
                * <restriction> among its [children] ... the ·actual value· of
                * whose base [attribute] must be the same as the ·actual value·
                * of its own name attribute plus target namespace;"
                */
                xmlSchemaPCustomErrExt(ctxt, XML_SCHEMAP_SRC_REDEFINE,
                    NULL, node, "This is a redefinition, but the QName "
                    "value '%s' of the 'base' attribute does not match the "
                    "type's designation '%s'",
                    xmlSchemaFormatQName(&str1, type->baseNs, type->base),
                    xmlSchemaFormatQName(&str2, type->targetNamespace,
                        type->name), NULL);
                FREE_AND_NULL(str1);
                FREE_AND_NULL(str2);
                /* Avoid confusion and erase the values. */
                type->base = NULL;
                type->baseNs = NULL;
            }
        }               
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
        * Add the annotation to the simple type ancestor.
        */
        xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) type,
            xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (parentType == XML_SCHEMA_TYPE_SIMPLE) {
        /*
        * Corresponds to <simpleType><restriction><simpleType>.
        */
        if (IS_SCHEMA(child, "simpleType")) {
            if (type->base != NULL) {
                /*
                * src-restriction-base-or-simpleType
                * Either the base [attribute] or the simpleType [child] of the
                * <restriction> element must be present, but not both.
                */
                xmlSchemaPContentErr(ctxt,
                    XML_SCHEMAP_SRC_RESTRICTION_BASE_OR_SIMPLETYPE,
                    NULL, node, child,
                    "The attribute 'base' and the <simpleType> child are "
                    "mutually exclusive", NULL);
            } else {
                type->baseType = (xmlSchemaTypePtr)
                    xmlSchemaParseSimpleType(ctxt, schema, child, 0);
            }
            child = child->next;
        } else if (type->base == NULL) {
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_SRC_RESTRICTION_BASE_OR_SIMPLETYPE,
                NULL, node, child,
                "Either the attribute 'base' or a <simpleType> child "
                "must be present", NULL);
        }
    } else if (parentType == XML_SCHEMA_TYPE_COMPLEX_CONTENT) {
        /*
        * Corresponds to <complexType><complexContent><restriction>...
        * followed by:
        *
        * Model groups <all>, <choice> and <sequence>.
        */
        if (IS_SCHEMA(child, "all")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt, schema, child,
                    XML_SCHEMA_TYPE_ALL, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "choice")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt,
                    schema, child, XML_SCHEMA_TYPE_CHOICE, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "sequence")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt, schema, child,
                    XML_SCHEMA_TYPE_SEQUENCE, 1);
            child = child->next;
        /*
        * Model group reference <group>.
        */
        } else if (IS_SCHEMA(child, "group")) {     
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroupDefRef(ctxt, schema, child);
            /*
            * Note that the reference will be resolved in
            * xmlSchemaResolveTypeReferences();
            */
            child = child->next;
        }
    } else if (parentType == XML_SCHEMA_TYPE_SIMPLE_CONTENT) {
        /*
        * Corresponds to <complexType><simpleContent><restriction>...
        *
        * "1.1 the simple type definition corresponding to the <simpleType>
        * among the [children] of <restriction> if there is one;"
        */
        if (IS_SCHEMA(child, "simpleType")) {
            /*
            * We will store the to-be-restricted simple type in
            * type->contentTypeDef *temporarily*.
            */
            type->contentTypeDef = (xmlSchemaTypePtr)
                xmlSchemaParseSimpleType(ctxt, schema, child, 0);
            if ( type->contentTypeDef == NULL)
                return (NULL);
            child = child->next;
        }
    }

    if ((parentType == XML_SCHEMA_TYPE_SIMPLE) ||
        (parentType == XML_SCHEMA_TYPE_SIMPLE_CONTENT)) {
        xmlSchemaFacetPtr facet, lastfacet = NULL;
        /*
        * Corresponds to <complexType><simpleContent><restriction>...
        * <simpleType><restriction>...
        */

        /*
        * Add the facets to the simple type ancestor.
        */
        /*
        * TODO: Datatypes: 4.1.3 Constraints on XML Representation of
        * Simple Type Definition Schema Representation Constraint:
        * *Single Facet Value*
        */
        while ((IS_SCHEMA(child, "minInclusive")) ||
            (IS_SCHEMA(child, "minExclusive")) ||
            (IS_SCHEMA(child, "maxInclusive")) ||
            (IS_SCHEMA(child, "maxExclusive")) ||
            (IS_SCHEMA(child, "totalDigits")) ||
            (IS_SCHEMA(child, "fractionDigits")) ||
            (IS_SCHEMA(child, "pattern")) ||
            (IS_SCHEMA(child, "enumeration")) ||
            (IS_SCHEMA(child, "whiteSpace")) ||
            (IS_SCHEMA(child, "length")) ||
            (IS_SCHEMA(child, "maxLength")) ||
            (IS_SCHEMA(child, "minLength"))) {
            facet = xmlSchemaParseFacet(ctxt, schema, child);
            if (facet != NULL) {
                if (lastfacet == NULL)
                    type->facets = facet;
                else
                    lastfacet->next = facet;
                lastfacet = facet;
                lastfacet->next = NULL;
            }
            child = child->next;
        }
        /*
        * Create links for derivation and validation.
        */
        if (type->facets != NULL) {
            xmlSchemaFacetLinkPtr facetLink, lastFacetLink = NULL;

            facet = type->facets;
            do {
                facetLink = (xmlSchemaFacetLinkPtr)
                    xmlMalloc(sizeof(xmlSchemaFacetLink));
                if (facetLink == NULL) {
                    xmlSchemaPErrMemory(ctxt, "allocating a facet link", NULL);
                    xmlFree(facetLink);
                    return (NULL);
                }
                facetLink->facet = facet;
                facetLink->next = NULL;
                if (lastFacetLink == NULL)
                    type->facetSet = facetLink;
                else
                    lastFacetLink->next = facetLink;
                lastFacetLink = facetLink;
                facet = facet->next;
            } while (facet != NULL);
        }
    }
    if (type->type == XML_SCHEMA_TYPE_COMPLEX) {
        /*
        * Attribute uses/declarations.
        */
        if (xmlSchemaParseLocalAttributes(ctxt, schema, &child,
            (xmlSchemaItemListPtr *) &(type->attrUses),
            XML_SCHEMA_TYPE_RESTRICTION, NULL) == -1)
            return(NULL);
        /*
        * Attribute wildcard.
        */
        if (IS_SCHEMA(child, "anyAttribute")) {
            type->attributeWildcard =
                xmlSchemaParseAnyAttribute(ctxt, schema, child);
            child = child->next;
        }
    }
    if (child != NULL) {
        if (parentType == XML_SCHEMA_TYPE_COMPLEX_CONTENT) {
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "annotation?, (group | all | choice | sequence)?, "
                "((attribute | attributeGroup)*, anyAttribute?))");
        } else if (parentType == XML_SCHEMA_TYPE_SIMPLE_CONTENT) {
             xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "(annotation?, (simpleType?, (minExclusive | minInclusive | "
                "maxExclusive | maxInclusive | totalDigits | fractionDigits | "
                "length | minLength | maxLength | enumeration | whiteSpace | "
                "pattern)*)?, ((attribute | attributeGroup)*, anyAttribute?))");
        } else {
            /* Simple type */
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "(annotation?, (simpleType?, (minExclusive | minInclusive | "
                "maxExclusive | maxInclusive | totalDigits | fractionDigits | "
                "length | minLength | maxLength | enumeration | whiteSpace | "
                "pattern)*))");
        }
    }
    return (NULL);
}

/**
 * xmlSchemaParseExtension:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parses an <extension>, which is found inside a
 * <simpleContent> or <complexContent>.
 * *WARNING* this interface is highly subject to change.
 *
 * TODO: Returns the type definition or NULL in case of error
 */
static xmlSchemaTypePtr
xmlSchemaParseExtension(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                        xmlNodePtr node, xmlSchemaTypeType parentType)
{
    xmlSchemaTypePtr type;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    /* Not a component, don't create it. */
    type = ctxt->ctxtType;
    type->flags |= XML_SCHEMAS_TYPE_DERIVATION_METHOD_EXTENSION;

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "base"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");

    /*
    * Attribute "base" - mandatory.
    */
    if ((xmlSchemaPValAttrQName(ctxt, schema, NULL, node,
        "base", &(type->baseNs), &(type->base)) == 0) &&
        (type->base == NULL)) {
        xmlSchemaPMissingAttrErr(ctxt,
            XML_SCHEMAP_S4S_ATTR_MISSING,
            NULL, node, "base", NULL);
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
        * Add the annotation to the type ancestor.
        */
        xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) type,
            xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (parentType == XML_SCHEMA_TYPE_COMPLEX_CONTENT) {
        /*
        * Corresponds to <complexType><complexContent><extension>... and:
        *
        * Model groups <all>, <choice>, <sequence> and <group>.
        */
        if (IS_SCHEMA(child, "all")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt, schema,
                    child, XML_SCHEMA_TYPE_ALL, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "choice")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt, schema,
                    child, XML_SCHEMA_TYPE_CHOICE, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "sequence")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt, schema,
                child, XML_SCHEMA_TYPE_SEQUENCE, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "group")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroupDefRef(ctxt, schema, child);
            /*
            * Note that the reference will be resolved in
            * xmlSchemaResolveTypeReferences();
            */
            child = child->next;
        }
    }
    if (child != NULL) {
        /*
        * Attribute uses/declarations.
        */
        if (xmlSchemaParseLocalAttributes(ctxt, schema, &child,
            (xmlSchemaItemListPtr *) &(type->attrUses),
            XML_SCHEMA_TYPE_EXTENSION, NULL) == -1)
            return(NULL);
        /*
        * Attribute wildcard.
        */
        if (IS_SCHEMA(child, "anyAttribute")) {
            ctxt->ctxtType->attributeWildcard =
                xmlSchemaParseAnyAttribute(ctxt, schema, child);
            child = child->next;
        }
    }
    if (child != NULL) {
        if (parentType == XML_SCHEMA_TYPE_COMPLEX_CONTENT) {
            /* Complex content extension. */
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "(annotation?, ((group | all | choice | sequence)?, "
                "((attribute | attributeGroup)*, anyAttribute?)))");
        } else {
            /* Simple content extension. */
            xmlSchemaPContentErr(ctxt,
                XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
                NULL, node, child, NULL,
                "(annotation?, ((attribute | attributeGroup)*, "
                "anyAttribute?))");
        }
    }
    return (NULL);
}

/**
 * xmlSchemaParseSimpleContent:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema SimpleContent definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns the type definition or NULL in case of error
 */
static int
xmlSchemaParseSimpleContent(xmlSchemaParserCtxtPtr ctxt,
                            xmlSchemaPtr schema, xmlNodePtr node,
                            int *hasRestrictionOrExtension)
{
    xmlSchemaTypePtr type;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL) ||
        (hasRestrictionOrExtension == NULL))
        return (-1);
    *hasRestrictionOrExtension = 0;
    /* Not a component, don't create it. */
    type = ctxt->ctxtType;
    type->contentType = XML_SCHEMA_CONTENT_SIMPLE;
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id"))) {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");

    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
        * Add the annotation to the complex type ancestor.
        */
        xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) type,
            xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (child == NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_MISSING,
            NULL, node, NULL, NULL,
            "(annotation?, (restriction | extension))");        
    }
    if (child == NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_MISSING,
            NULL, node, NULL, NULL,
            "(annotation?, (restriction | extension))");        
    }
    if (IS_SCHEMA(child, "restriction")) {
        xmlSchemaParseRestriction(ctxt, schema, child,
            XML_SCHEMA_TYPE_SIMPLE_CONTENT);
        (*hasRestrictionOrExtension) = 1;
        child = child->next;
    } else if (IS_SCHEMA(child, "extension")) {
        xmlSchemaParseExtension(ctxt, schema, child,
            XML_SCHEMA_TYPE_SIMPLE_CONTENT);
        (*hasRestrictionOrExtension) = 1;
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child, NULL,
            "(annotation?, (restriction | extension))");
    }
    return (0);
}

/**
 * xmlSchemaParseComplexContent:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema ComplexContent definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns the type definition or NULL in case of error
 */
static int
xmlSchemaParseComplexContent(xmlSchemaParserCtxtPtr ctxt,
                             xmlSchemaPtr schema, xmlNodePtr node,
                             int *hasRestrictionOrExtension)
{
    xmlSchemaTypePtr type;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL) ||
        (hasRestrictionOrExtension == NULL))
        return (-1);
    *hasRestrictionOrExtension = 0;
    /* Not a component, don't create it. */
    type = ctxt->ctxtType;
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
                (!xmlStrEqual(attr->name, BAD_CAST "mixed")))
            {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");

    /*
    * Set the 'mixed' on the complex type ancestor.
    */
    if (xmlGetBooleanProp(ctxt, node, "mixed", 0))  {
        if ((type->flags & XML_SCHEMAS_TYPE_MIXED) == 0)
            type->flags |= XML_SCHEMAS_TYPE_MIXED;
    }
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
        * Add the annotation to the complex type ancestor.
        */
        xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) type,
            xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (child == NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_MISSING,
            NULL, node, NULL,
            NULL, "(annotation?, (restriction | extension))");
    }
    if (child == NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_MISSING,
            NULL, node, NULL,
            NULL, "(annotation?, (restriction | extension))");
    }
    if (IS_SCHEMA(child, "restriction")) {
        xmlSchemaParseRestriction(ctxt, schema, child,
            XML_SCHEMA_TYPE_COMPLEX_CONTENT);
        (*hasRestrictionOrExtension) = 1;
        child = child->next;
    } else if (IS_SCHEMA(child, "extension")) {
        xmlSchemaParseExtension(ctxt, schema, child,
            XML_SCHEMA_TYPE_COMPLEX_CONTENT);
        (*hasRestrictionOrExtension) = 1;
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child,
            NULL, "(annotation?, (restriction | extension))");
    }
    return (0);
}

/**
 * xmlSchemaParseComplexType:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Complex Type definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns the type definition or NULL in case of error
 */
static xmlSchemaTypePtr
xmlSchemaParseComplexType(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                          xmlNodePtr node, int topLevel)
{
    xmlSchemaTypePtr type, ctxtType;
    xmlNodePtr child = NULL;
    const xmlChar *name = NULL;
    xmlAttrPtr attr;
    const xmlChar *attrValue;
#ifdef ENABLE_NAMED_LOCALS
    char buf[40];
#endif
    int final = 0, block = 0, hasRestrictionOrExtension = 0;


    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    ctxtType = ctxt->ctxtType;

    if (topLevel) {
        attr = xmlSchemaGetPropNode(node, "name");
        if (attr == NULL) {
            xmlSchemaPMissingAttrErr(ctxt,
                XML_SCHEMAP_S4S_ATTR_MISSING, NULL, node, "name", NULL);
            return (NULL);
        } else if (xmlSchemaPValAttrNode(ctxt, NULL, attr,
            xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
            return (NULL);
        }       
    }

    if (topLevel == 0) {
        /*
        * Parse as local complex type definition.
        */
#ifdef ENABLE_NAMED_LOCALS
        snprintf(buf, 39, "#CT%d", ctxt->counter++ + 1);
        type = xmlSchemaAddType(ctxt, schema,
            XML_SCHEMA_TYPE_COMPLEX,
            xmlDictLookup(ctxt->dict, (const xmlChar *)buf, -1),
            ctxt->targetNamespace, node, 0);
#else
        type = xmlSchemaAddType(ctxt, schema,
            XML_SCHEMA_TYPE_COMPLEX,
            NULL, ctxt->targetNamespace, node, 0);
#endif
        if (type == NULL)
            return (NULL);
        name = type->name;
        type->node = node;
        type->type = XML_SCHEMA_TYPE_COMPLEX;
        /*
        * TODO: We need the target namespace.
        */
    } else {
        /*
        * Parse as global complex type definition.
        */
        type = xmlSchemaAddType(ctxt, schema,
            XML_SCHEMA_TYPE_COMPLEX,
            name, ctxt->targetNamespace, node, 1);
        if (type == NULL)
            return (NULL);
        type->node = node;
        type->type = XML_SCHEMA_TYPE_COMPLEX;
        type->flags |= XML_SCHEMAS_TYPE_GLOBAL;
    }
    type->targetNamespace = ctxt->targetNamespace;
    /*
    * Handle attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
        if (attr->ns == NULL) {
            if (xmlStrEqual(attr->name, BAD_CAST "id")) {
                /*
                * Attribute "id".
                */
                xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
            } else if (xmlStrEqual(attr->name, BAD_CAST "mixed")) {
                /*
                * Attribute "mixed".
                */
                if (xmlSchemaPGetBoolNodeValue(ctxt,
                        NULL, (xmlNodePtr) attr))
                    type->flags |= XML_SCHEMAS_TYPE_MIXED;
            } else if (topLevel) {
                /*
                * Attributes of global complex type definitions.
                */
                if (xmlStrEqual(attr->name, BAD_CAST "name")) {
                    /* Pass. */
                } else if (xmlStrEqual(attr->name, BAD_CAST "abstract")) {
                    /*
                    * Attribute "abstract".
                    */
                    if (xmlSchemaPGetBoolNodeValue(ctxt,
                            NULL, (xmlNodePtr) attr))
                        type->flags |= XML_SCHEMAS_TYPE_ABSTRACT;
                } else if (xmlStrEqual(attr->name, BAD_CAST "final")) {
                    /*
                    * Attribute "final".
                    */
                    attrValue = xmlSchemaGetNodeContent(ctxt,
                        (xmlNodePtr) attr);
                    if (xmlSchemaPValAttrBlockFinal(attrValue,
                        &(type->flags),
                        -1,
                        XML_SCHEMAS_TYPE_FINAL_EXTENSION,
                        XML_SCHEMAS_TYPE_FINAL_RESTRICTION,
                        -1, -1, -1) != 0)
                    {
                        xmlSchemaPSimpleTypeErr(ctxt,
                            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                            NULL, (xmlNodePtr) attr, NULL,
                            "(#all | List of (extension | restriction))",
                            attrValue, NULL, NULL, NULL);
                    } else 
                        final = 1;
                } else if (xmlStrEqual(attr->name, BAD_CAST "block")) {
                    /*
                    * Attribute "block".
                    */
                    attrValue = xmlSchemaGetNodeContent(ctxt,
                        (xmlNodePtr) attr);
                    if (xmlSchemaPValAttrBlockFinal(attrValue, &(type->flags),
                        -1,
                        XML_SCHEMAS_TYPE_BLOCK_EXTENSION,
                        XML_SCHEMAS_TYPE_BLOCK_RESTRICTION,
                        -1, -1, -1) != 0) {
                        xmlSchemaPSimpleTypeErr(ctxt,
                            XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
                            NULL, (xmlNodePtr) attr, NULL,
                            "(#all | List of (extension | restriction)) ",
                            attrValue, NULL, NULL, NULL);
                    } else 
                        block = 1;
                } else {
                        xmlSchemaPIllegalAttrErr(ctxt,
                            XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
                }
            } else {
                xmlSchemaPIllegalAttrErr(ctxt,
                    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
            }
        } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
            xmlSchemaPIllegalAttrErr(ctxt, 
                XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
        }
        attr = attr->next;
    }
    if (! block) {
        /*
        * Apply default "block" values.
        */
        if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION)
            type->flags |= XML_SCHEMAS_TYPE_BLOCK_RESTRICTION;
        if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION)
            type->flags |= XML_SCHEMAS_TYPE_BLOCK_EXTENSION;
    }
    if (! final) {
        /*
        * Apply default "block" values.
        */
        if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION)
            type->flags |= XML_SCHEMAS_TYPE_FINAL_RESTRICTION;
        if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_EXTENSION)
            type->flags |= XML_SCHEMAS_TYPE_FINAL_EXTENSION;
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        type->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    ctxt->ctxtType = type;
    if (IS_SCHEMA(child, "simpleContent")) {
        /*
        * <complexType><simpleContent>...
        * 3.4.3 : 2.2
        * Specifying mixed='true' when the <simpleContent>
        * alternative is chosen has no effect
        */
        if (type->flags & XML_SCHEMAS_TYPE_MIXED)
            type->flags ^= XML_SCHEMAS_TYPE_MIXED;
        xmlSchemaParseSimpleContent(ctxt, schema, child,
            &hasRestrictionOrExtension);
        child = child->next;
    } else if (IS_SCHEMA(child, "complexContent")) {
        /*
        * <complexType><complexContent>...
        */
        type->contentType = XML_SCHEMA_CONTENT_EMPTY;
        xmlSchemaParseComplexContent(ctxt, schema, child,
            &hasRestrictionOrExtension);
        child = child->next;
    } else {
        /*
        * E.g <complexType><sequence>... or <complexType><attribute>... etc.
        *
        * SPEC
        * "...the third alternative (neither <simpleContent> nor
        * <complexContent>) is chosen. This case is understood as shorthand
        * for complex content restricting the ·ur-type definition·, and the
        * details of the mappings should be modified as necessary.
        */
        type->baseType = xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYTYPE);
        type->flags |= XML_SCHEMAS_TYPE_DERIVATION_METHOD_RESTRICTION;
        /*
        * Parse model groups.
        */
        if (IS_SCHEMA(child, "all")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt, schema, child,
                    XML_SCHEMA_TYPE_ALL, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "choice")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt, schema, child,
                    XML_SCHEMA_TYPE_CHOICE, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "sequence")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroup(ctxt, schema, child,
                    XML_SCHEMA_TYPE_SEQUENCE, 1);
            child = child->next;
        } else if (IS_SCHEMA(child, "group")) {
            type->subtypes = (xmlSchemaTypePtr)
                xmlSchemaParseModelGroupDefRef(ctxt, schema, child);
            /*
            * Note that the reference will be resolved in
            * xmlSchemaResolveTypeReferences();
            */
            child = child->next;
        }
        /*
        * Parse attribute decls/refs.
        */
        if (xmlSchemaParseLocalAttributes(ctxt, schema, &child,
            (xmlSchemaItemListPtr *) &(type->attrUses),
            XML_SCHEMA_TYPE_RESTRICTION, NULL) == -1)
            return(NULL);
        /*
        * Parse attribute wildcard.
        */
        if (IS_SCHEMA(child, "anyAttribute")) {
            type->attributeWildcard = xmlSchemaParseAnyAttribute(ctxt, schema, child);
            child = child->next;
        }
    }
    if (child != NULL) {
        xmlSchemaPContentErr(ctxt,
            XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
            NULL, node, child,
            NULL, "(annotation?, (simpleContent | complexContent | "
            "((group | all | choice | sequence)?, ((attribute | "
            "attributeGroup)*, anyAttribute?))))");
    }
    /*
    * REDEFINE: SPEC src-redefine (5)
    */
    if (topLevel && ctxt->isRedefine && (! hasRestrictionOrExtension)) {
        xmlSchemaPCustomErr(ctxt, XML_SCHEMAP_SRC_REDEFINE,
            NULL, node, "This is a redefinition, thus the "
            "<complexType> must have a <restriction> or <extension> "
            "grand-child", NULL);
    }
    ctxt->ctxtType = ctxtType;
    return (type);
}

/************************************************************************
 *                                                                      *
 *                      Validating using Schemas                        *
 *                                                                      *
 ************************************************************************/

/************************************************************************
 *                                                                      *
 *                      Reading/Writing Schemas                         *
 *                                                                      *
 ************************************************************************/

#if 0 /* Will be enabled if it is clear what options are needed. */
/**
 * xmlSchemaParserCtxtSetOptions:
 * @ctxt:       a schema parser context
 * @options: a combination of xmlSchemaParserOption
 *
 * Sets the options to be used during the parse.
 *
 * Returns 0 in case of success, -1 in case of an
 * API error.
 */
static int
xmlSchemaParserCtxtSetOptions(xmlSchemaParserCtxtPtr ctxt,
                              int options)

{
    int i;

    if (ctxt == NULL)
        return (-1);
    /*
    * WARNING: Change the start value if adding to the
    * xmlSchemaParseOption.
    */
    for (i = 1; i < (int) sizeof(int) * 8; i++) {
        if (options & 1<<i) {
            return (-1);
        }
    }
    ctxt->options = options;
    return (0);
}

/**
 * xmlSchemaValidCtxtGetOptions:
 * @ctxt: a schema parser context
 *
 * Returns the option combination of the parser context.
 */
static int
xmlSchemaParserCtxtGetOptions(xmlSchemaParserCtxtPtr ctxt)

{
    if (ctxt == NULL)
        return (-1);
    else
        return (ctxt->options);
}
#endif

/**
 * xmlSchemaNewParserCtxt:
 * @URL:  the location of the schema
 *
 * Create an XML Schemas parse context for that file/resource expected
 * to contain an XML Schemas file.
 *
 * Returns the parser context or NULL in case of error
 */
xmlSchemaParserCtxtPtr
xmlSchemaNewParserCtxt(const char *URL)
{
    xmlSchemaParserCtxtPtr ret;

    if (URL == NULL)
        return (NULL);

    ret = xmlSchemaParserCtxtCreate();
    if (ret == NULL)
        return(NULL);
    ret->dict = xmlDictCreate();
    ret->URL = xmlDictLookup(ret->dict, (const xmlChar *) URL, -1);
    return (ret);
}

/**
 * xmlSchemaNewMemParserCtxt:
 * @buffer:  a pointer to a char array containing the schemas
 * @size:  the size of the array
 *
 * Create an XML Schemas parse context for that memory buffer expected
 * to contain an XML Schemas file.
 *
 * Returns the parser context or NULL in case of error
 */
xmlSchemaParserCtxtPtr
xmlSchemaNewMemParserCtxt(const char *buffer, int size)
{
    xmlSchemaParserCtxtPtr ret;

    if ((buffer == NULL) || (size <= 0))
        return (NULL);
    ret = xmlSchemaParserCtxtCreate();
    if (ret == NULL)
        return(NULL);
    ret->buffer = buffer;
    ret->size = size;
    ret->dict = xmlDictCreate();    
    return (ret);
}

/**
 * xmlSchemaNewDocParserCtxt:
 * @doc:  a preparsed document tree
 *
 * Create an XML Schemas parse context for that document.
 * NB. The document may be modified during the parsing process.
 *
 * Returns the parser context or NULL in case of error
 */
xmlSchemaParserCtxtPtr
xmlSchemaNewDocParserCtxt(xmlDocPtr doc)
{
    xmlSchemaParserCtxtPtr ret;

    if (doc == NULL)
      return (NULL);
    ret = xmlSchemaParserCtxtCreate();
    if (ret == NULL)
        return(NULL);
    ret->doc = doc;
    ret->dict = xmlDictCreate();
    /* The application has responsibility for the document */
    ret->preserve = 1;

    return (ret);
}

/**
 * xmlSchemaFreeParserCtxt:
 * @ctxt:  the schema parser context
 *
 * Free the resources associated to the schema parser context
 */
void
xmlSchemaFreeParserCtxt(xmlSchemaParserCtxtPtr ctxt)
{
    if (ctxt == NULL)
        return;
    if (ctxt->doc != NULL && !ctxt->preserve)
        xmlFreeDoc(ctxt->doc);    
    if (ctxt->vctxt != NULL) {
        xmlSchemaFreeValidCtxt(ctxt->vctxt);
    }
    if (ctxt->ownsConstructor && (ctxt->constructor != NULL)) {
        xmlSchemaConstructionCtxtFree(ctxt->constructor);
        ctxt->constructor = NULL;
        ctxt->ownsConstructor = 0;
    }
    if (ctxt->attrProhibs != NULL)
        xmlSchemaItemListFree(ctxt->attrProhibs);
    xmlDictFree(ctxt->dict);
    xmlFree(ctxt);
}

/************************************************************************
 *                                                                      *
 *                      Building the content models                     *
 *                                                                      *
 ************************************************************************/

static void
xmlSchemaBuildContentModelForSubstGroup(xmlSchemaParserCtxtPtr pctxt,
        xmlSchemaParticlePtr particle, int counter, xmlAutomataStatePtr end)
{
    xmlAutomataStatePtr start, tmp;
    xmlSchemaElementPtr elemDecl, member;
    xmlSchemaSubstGroupPtr substGroup;
    int i;

    elemDecl = (xmlSchemaElementPtr) particle->children;
    /*
    * Wrap the substitution group with a CHOICE.
    */
    start = pctxt->state;
    if (end == NULL)
        end = xmlAutomataNewState(pctxt->am);
    substGroup = xmlSchemaSubstGroupGet(pctxt, elemDecl);
    if (substGroup == NULL) {
        xmlSchemaPErr(pctxt, WXS_ITEM_NODE(particle),
            XML_SCHEMAP_INTERNAL,
            "Internal error: xmlSchemaBuildContentModelForSubstGroup, "
            "declaration is marked having a subst. group but none "
            "available.\n", elemDecl->name, NULL);
        return;
    }
    if (counter >= 0) {
        /*
        * NOTE that we put the declaration in, even if it's abstract.
        * However, an error will be raised during *validation* if an element
        * information item shall be validated against an abstract element
        * declaration.
        */
        tmp = xmlAutomataNewCountedTrans(pctxt->am, start, NULL, counter);
        xmlAutomataNewTransition2(pctxt->am, tmp, end,
                    elemDecl->name, elemDecl->targetNamespace, elemDecl);
        /*
        * Add subst. group members.
        */
        for (i = 0; i < substGroup->members->nbItems; i++) {
            member = (xmlSchemaElementPtr) substGroup->members->items[i];
            xmlAutomataNewTransition2(pctxt->am, tmp, end,
                               member->name, member->targetNamespace, member);
        }
    } else if (particle->maxOccurs == 1) {
        /*
        * NOTE that we put the declaration in, even if it's abstract,
        */
        xmlAutomataNewEpsilon(pctxt->am,
            xmlAutomataNewTransition2(pctxt->am,
            start, NULL,
            elemDecl->name, elemDecl->targetNamespace, elemDecl), end);
        /*
        * Add subst. group members.
        */
        for (i = 0; i < substGroup->members->nbItems; i++) {
            member = (xmlSchemaElementPtr) substGroup->members->items[i];
            /*
            * NOTE: This fixes bug #341150. xmlAutomataNewOnceTrans2()
            *  was incorrectly used instead of xmlAutomataNewTransition2()
            *  (seems like a copy&paste bug from the XML_SCHEMA_TYPE_ALL
            *  section in xmlSchemaBuildAContentModel() ).
            * TODO: Check if xmlAutomataNewOnceTrans2() was instead 
            *  intended for the above "counter" section originally. I.e.,
            *  check xs:all with subst-groups.
            *
            * tmp = xmlAutomataNewOnceTrans2(pctxt->am, start, NULL,
            *                  member->name, member->targetNamespace,
            *                  1, 1, member);
            */
            tmp = xmlAutomataNewTransition2(pctxt->am, start, NULL,
                member->name, member->targetNamespace, member);     
            xmlAutomataNewEpsilon(pctxt->am, tmp, end);
        }
    } else {
        xmlAutomataStatePtr hop;
        int maxOccurs = particle->maxOccurs == UNBOUNDED ?
            UNBOUNDED : particle->maxOccurs - 1;
        int minOccurs = particle->minOccurs < 1 ? 0 : particle->minOccurs - 1;

        counter =
            xmlAutomataNewCounter(pctxt->am, minOccurs,
            maxOccurs);
        hop = xmlAutomataNewState(pctxt->am);

        xmlAutomataNewEpsilon(pctxt->am,
            xmlAutomataNewTransition2(pctxt->am,
            start, NULL,
            elemDecl->name, elemDecl->targetNamespace, elemDecl),
            hop);
        /*
         * Add subst. group members.
         */
        for (i = 0; i < substGroup->members->nbItems; i++) {
            member = (xmlSchemaElementPtr) substGroup->members->items[i];
            xmlAutomataNewEpsilon(pctxt->am,
                xmlAutomataNewTransition2(pctxt->am,
                start, NULL,
                member->name, member->targetNamespace, member),
                hop);
        }
        xmlAutomataNewCountedTrans(pctxt->am, hop, start, counter);
        xmlAutomataNewCounterTrans(pctxt->am, hop, end, counter);
    }
    if (particle->minOccurs == 0)
        xmlAutomataNewEpsilon(pctxt->am, start, end);
    pctxt->state = end;
}

static void
xmlSchemaBuildContentModelForElement(xmlSchemaParserCtxtPtr ctxt,
                                     xmlSchemaParticlePtr particle)
{
    if (((xmlSchemaElementPtr) particle->children)->flags &
        XML_SCHEMAS_ELEM_SUBST_GROUP_HEAD) {
        /*
        * Substitution groups.
        */
        xmlSchemaBuildContentModelForSubstGroup(ctxt, particle, -1, NULL);
    } else {
        xmlSchemaElementPtr elemDecl;
        xmlAutomataStatePtr start;

        elemDecl = (xmlSchemaElementPtr) particle->children;

        if (elemDecl->flags & XML_SCHEMAS_ELEM_ABSTRACT)
            return;
        if (particle->maxOccurs == 1) {
            start = ctxt->state;
            ctxt->state = xmlAutomataNewTransition2(ctxt->am, start, NULL,
                    elemDecl->name, elemDecl->targetNamespace, elemDecl);
        } else if ((particle->maxOccurs >= UNBOUNDED) &&
                   (particle->minOccurs < 2)) {
            /* Special case. */
            start = ctxt->state;            
            ctxt->state = xmlAutomataNewTransition2(ctxt->am, start, NULL,
                elemDecl->name, elemDecl->targetNamespace, elemDecl);       
            ctxt->state = xmlAutomataNewTransition2(ctxt->am, ctxt->state, ctxt->state,
                elemDecl->name, elemDecl->targetNamespace, elemDecl);       
        } else {
            int counter;
            int maxOccurs = particle->maxOccurs == UNBOUNDED ?
                            UNBOUNDED : particle->maxOccurs - 1;
            int minOccurs = particle->minOccurs < 1 ?
                            0 : particle->minOccurs - 1;

            start = xmlAutomataNewEpsilon(ctxt->am, ctxt->state, NULL);
            counter = xmlAutomataNewCounter(ctxt->am, minOccurs, maxOccurs);
            ctxt->state = xmlAutomataNewTransition2(ctxt->am, start, NULL,
                elemDecl->name, elemDecl->targetNamespace, elemDecl);
            xmlAutomataNewCountedTrans(ctxt->am, ctxt->state, start, counter);
            ctxt->state = xmlAutomataNewCounterTrans(ctxt->am, ctxt->state,
                NULL, counter);
        }
        if (particle->minOccurs == 0)
            xmlAutomataNewEpsilon(ctxt->am, start, ctxt->state);
    }
}

/**
 * xmlSchemaBuildAContentModel:
 * @ctxt:  the schema parser context
 * @particle:  the particle component
 * @name:  the complex type's name whose content is being built
 *
 * Create the automaton for the {content type} of a complex type.
 *
 */
static void
xmlSchemaBuildAContentModel(xmlSchemaParserCtxtPtr pctxt,
                            xmlSchemaParticlePtr particle)
{
    if (particle == NULL) {
        PERROR_INT("xmlSchemaBuildAContentModel", "particle is NULL");      
        return;
    }
    if (particle->children == NULL) {
        /*
        * Just return in this case. A missing "term" of the particle
        * might arise due to an invalid "term" component.
        */
        return;
    }

    switch (particle->children->type) {
        case XML_SCHEMA_TYPE_ANY: {
            xmlAutomataStatePtr start, end;
            xmlSchemaWildcardPtr wild;
            xmlSchemaWildcardNsPtr ns;

            wild = (xmlSchemaWildcardPtr) particle->children;

            start = pctxt->state;
            end = xmlAutomataNewState(pctxt->am);

            if (particle->maxOccurs == 1) {
                if (wild->any == 1) {
                    /*
                    * We need to add both transitions:
                    *
                    * 1. the {"*", "*"} for elements in a namespace.
                    */
                    pctxt->state =
                        xmlAutomataNewTransition2(pctxt->am,
                        start, NULL, BAD_CAST "*", BAD_CAST "*", wild);
                    xmlAutomataNewEpsilon(pctxt->am, pctxt->state, end);
                    /*
                    * 2. the {"*"} for elements in no namespace.
                    */
                    pctxt->state =
                        xmlAutomataNewTransition2(pctxt->am,
                        start, NULL, BAD_CAST "*", NULL, wild);
                    xmlAutomataNewEpsilon(pctxt->am, pctxt->state, end);

                } else if (wild->nsSet != NULL) {
                    ns = wild->nsSet;
                    do {
                        pctxt->state = start;
                        pctxt->state = xmlAutomataNewTransition2(pctxt->am,
                            pctxt->state, NULL, BAD_CAST "*", ns->value, wild);
                        xmlAutomataNewEpsilon(pctxt->am, pctxt->state, end);
                        ns = ns->next;
                    } while (ns != NULL);

                } else if (wild->negNsSet != NULL) {
                    pctxt->state = xmlAutomataNewNegTrans(pctxt->am,
                        start, end, BAD_CAST "*", wild->negNsSet->value,
                        wild);
                }
            } else {
                int counter;
                xmlAutomataStatePtr hop;
                int maxOccurs =
                    particle->maxOccurs == UNBOUNDED ? UNBOUNDED : particle->maxOccurs - 1;
                int minOccurs =
                    particle->minOccurs < 1 ? 0 : particle->minOccurs - 1;

                counter = xmlAutomataNewCounter(pctxt->am, minOccurs, maxOccurs);
                hop = xmlAutomataNewState(pctxt->am);
                if (wild->any == 1) {
                    pctxt->state =
                        xmlAutomataNewTransition2(pctxt->am,
                        start, NULL, BAD_CAST "*", BAD_CAST "*", wild);
                    xmlAutomataNewEpsilon(pctxt->am, pctxt->state, hop);
                    pctxt->state =
                        xmlAutomataNewTransition2(pctxt->am,
                        start, NULL, BAD_CAST "*", NULL, wild);
                    xmlAutomataNewEpsilon(pctxt->am, pctxt->state, hop);
                } else if (wild->nsSet != NULL) {
                    ns = wild->nsSet;
                    do {
                        pctxt->state =
                            xmlAutomataNewTransition2(pctxt->am,
                                start, NULL, BAD_CAST "*", ns->value, wild);
                        xmlAutomataNewEpsilon(pctxt->am, pctxt->state, hop);
                        ns = ns->next;
                    } while (ns != NULL);

                } else if (wild->negNsSet != NULL) {
                    pctxt->state = xmlAutomataNewNegTrans(pctxt->am,
                        start, hop, BAD_CAST "*", wild->negNsSet->value,
                        wild);
                }
                xmlAutomataNewCountedTrans(pctxt->am, hop, start, counter);
                xmlAutomataNewCounterTrans(pctxt->am, hop, end, counter);
            }
            if (particle->minOccurs == 0) {
                xmlAutomataNewEpsilon(pctxt->am, start, end);
            }
            pctxt->state = end;
            break;
        }
        case XML_SCHEMA_TYPE_ELEMENT:
            xmlSchemaBuildContentModelForElement(pctxt, particle);
            break;
        case XML_SCHEMA_TYPE_SEQUENCE:{
                xmlSchemaTreeItemPtr sub;

                /*
                 * If max and min occurances are default (1) then
                 * simply iterate over the particles of the <sequence>.
                 */
                if ((particle->minOccurs == 1) && (particle->maxOccurs == 1)) {
                    sub = particle->children->children;
                    while (sub != NULL) {
                        xmlSchemaBuildAContentModel(pctxt,
                            (xmlSchemaParticlePtr) sub);
                        sub = sub->next;
                    }
                } else {
                    xmlAutomataStatePtr oldstate = pctxt->state;

                    if (particle->maxOccurs >= UNBOUNDED) {
                        if (particle->minOccurs > 1) {
                            xmlAutomataStatePtr tmp;
                            int counter;

                            pctxt->state = xmlAutomataNewEpsilon(pctxt->am,
                                oldstate, NULL);
                            oldstate = pctxt->state;

                            counter = xmlAutomataNewCounter(pctxt->am,
                                particle->minOccurs - 1, UNBOUNDED);

                            sub = particle->children->children;
                            while (sub != NULL) {
                                xmlSchemaBuildAContentModel(pctxt,
                                    (xmlSchemaParticlePtr) sub);
                                sub = sub->next;
                            }
                            tmp = pctxt->state;
                            xmlAutomataNewCountedTrans(pctxt->am, tmp,
                                                       oldstate, counter);
                            pctxt->state =
                                xmlAutomataNewCounterTrans(pctxt->am, tmp,
                                                           NULL, counter);

                        } else {
                            pctxt->state = xmlAutomataNewEpsilon(pctxt->am,
                                oldstate, NULL);
                            oldstate = pctxt->state;

                            sub = particle->children->children;
                            while (sub != NULL) {
                                xmlSchemaBuildAContentModel(pctxt,
                                    (xmlSchemaParticlePtr) sub);
                                sub = sub->next;
                            }
                            xmlAutomataNewEpsilon(pctxt->am, pctxt->state,
                                                  oldstate);
                            /*
                             * epsilon needed to block previous trans from
                             * being allowed to enter back from another
                             * construct
                             */
                            pctxt->state = xmlAutomataNewEpsilon(pctxt->am,
                                                pctxt->state, NULL);
                            if (particle->minOccurs == 0) {
                                xmlAutomataNewEpsilon(pctxt->am,
                                    oldstate, pctxt->state);
                            }
                        }
                    } else if ((particle->maxOccurs > 1)
                               || (particle->minOccurs > 1)) {
                        xmlAutomataStatePtr tmp;
                        int counter;

                        pctxt->state = xmlAutomataNewEpsilon(pctxt->am,
                            oldstate, NULL);
                        oldstate = pctxt->state;

                        counter = xmlAutomataNewCounter(pctxt->am,
                            particle->minOccurs - 1,
                            particle->maxOccurs - 1);

                        sub = particle->children->children;
                        while (sub != NULL) {
                            xmlSchemaBuildAContentModel(pctxt,
                                (xmlSchemaParticlePtr) sub);
                            sub = sub->next;
                        }
                        tmp = pctxt->state;
                        xmlAutomataNewCountedTrans(pctxt->am,
                            tmp, oldstate, counter);
                        pctxt->state =
                            xmlAutomataNewCounterTrans(pctxt->am, tmp, NULL,
                                                       counter);
                        if (particle->minOccurs == 0) {
                            xmlAutomataNewEpsilon(pctxt->am,
                                oldstate, pctxt->state);
                        }
                    } else {
                        sub = particle->children->children;
                        while (sub != NULL) {
                            xmlSchemaBuildAContentModel(pctxt,
                                (xmlSchemaParticlePtr) sub);
                            sub = sub->next;
                        }
                        if (particle->minOccurs == 0) {
                            xmlAutomataNewEpsilon(pctxt->am, oldstate,
                                                  pctxt->state);
                        }
                    }
                }
                break;
            }
        case XML_SCHEMA_TYPE_CHOICE:{
                xmlSchemaTreeItemPtr sub;
                xmlAutomataStatePtr start, end;

                start = pctxt->state;
                end = xmlAutomataNewState(pctxt->am);

                /*
                 * iterate over the subtypes and remerge the end with an
                 * epsilon transition
                 */
                if (particle->maxOccurs == 1) {
                    sub = particle->children->children;
                    while (sub != NULL) {
                        pctxt->state = start;
                        xmlSchemaBuildAContentModel(pctxt,
                            (xmlSchemaParticlePtr) sub);
                        xmlAutomataNewEpsilon(pctxt->am, pctxt->state, end);
                        sub = sub->next;
                    }
                } else {
                    int counter;
                    xmlAutomataStatePtr hop, base;
                    int maxOccurs = particle->maxOccurs == UNBOUNDED ?
                        UNBOUNDED : particle->maxOccurs - 1;
                    int minOccurs =
                        particle->minOccurs < 1 ? 0 : particle->minOccurs - 1;

                    /*
                     * use a counter to keep track of the number of transtions
                     * which went through the choice.
                     */
                    counter =
                        xmlAutomataNewCounter(pctxt->am, minOccurs, maxOccurs);
                    hop = xmlAutomataNewState(pctxt->am);
                    base = xmlAutomataNewState(pctxt->am);

                    sub = particle->children->children;
                    while (sub != NULL) {
                        pctxt->state = base;
                        xmlSchemaBuildAContentModel(pctxt,
                            (xmlSchemaParticlePtr) sub);
                        xmlAutomataNewEpsilon(pctxt->am, pctxt->state, hop);
                        sub = sub->next;
                    }
                    xmlAutomataNewEpsilon(pctxt->am, start, base);
                    xmlAutomataNewCountedTrans(pctxt->am, hop, base, counter);
                    xmlAutomataNewCounterTrans(pctxt->am, hop, end, counter);
                }
                if (particle->minOccurs == 0) {
                    xmlAutomataNewEpsilon(pctxt->am, start, end);
                }
                pctxt->state = end;
                break;
            }
        case XML_SCHEMA_TYPE_ALL:{
                xmlAutomataStatePtr start;
                xmlSchemaParticlePtr sub;
                xmlSchemaElementPtr elemDecl;
                int lax;

                sub = (xmlSchemaParticlePtr) particle->children->children;
                if (sub == NULL)
                    break;
                start = pctxt->state;
                while (sub != NULL) {
                    pctxt->state = start;

                    elemDecl = (xmlSchemaElementPtr) sub->children;
                    if (elemDecl == NULL) {
                        PERROR_INT("xmlSchemaBuildAContentModel",
                            "<element> particle has no term");
                        return;
                    };
                    /*
                    * NOTE: The {max occurs} of all the particles in the
                    * {particles} of the group must be 0 or 1; this is
                    * already ensured during the parse of the content of
                    * <all>.
                    */
                    if (elemDecl->flags & XML_SCHEMAS_ELEM_SUBST_GROUP_HEAD) {
                        int counter;

                        /*
                         * This is an abstract group, we need to share
                         * the same counter for all the element transitions
                         * derived from the group
                         */
                        counter = xmlAutomataNewCounter(pctxt->am,
                                           sub->minOccurs, sub->maxOccurs);
                        xmlSchemaBuildContentModelForSubstGroup(pctxt,
                                           sub, counter, pctxt->state);
                    } else {
                        if ((sub->minOccurs == 1) &&
                            (sub->maxOccurs == 1)) {
                            xmlAutomataNewOnceTrans2(pctxt->am, pctxt->state,
                                                    pctxt->state,
                                                    elemDecl->name,
                                                    elemDecl->targetNamespace,
                                                    1, 1, elemDecl);
                        } else if ((sub->minOccurs == 0) &&
                            (sub->maxOccurs == 1)) {

                            xmlAutomataNewCountTrans2(pctxt->am, pctxt->state,
                                                     pctxt->state,
                                                     elemDecl->name,
                                                     elemDecl->targetNamespace,
                                                     0,
                                                     1,
                                                     elemDecl);
                        }
                    }
                    sub = (xmlSchemaParticlePtr) sub->next;
                }
                lax = particle->minOccurs == 0;
                pctxt->state =
                    xmlAutomataNewAllTrans(pctxt->am, pctxt->state, NULL, lax);
                break;
            }
        case XML_SCHEMA_TYPE_GROUP:
            /*
            * If we hit a model group definition, then this means that
            * it was empty, thus was not substituted for the containing
            * model group. Just do nothing in this case.
            * TODO: But the group should be substituted and not occur at
            * all in the content model at this point. Fix this.
            */
            break;
        default:
            xmlSchemaInternalErr2(ACTXT_CAST pctxt,
                "xmlSchemaBuildAContentModel",
                "found unexpected term of type '%s' in content model",
                WXS_ITEM_TYPE_NAME(particle->children), NULL);
            return;
    }
}

/**
 * xmlSchemaBuildContentModel:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 * @name:  the element name
 *
 * Builds the content model of the complex type.
 */
static void
xmlSchemaBuildContentModel(xmlSchemaTypePtr type,
                           xmlSchemaParserCtxtPtr ctxt)
{
    if ((type->type != XML_SCHEMA_TYPE_COMPLEX) ||
        (type->contModel != NULL) ||
        ((type->contentType != XML_SCHEMA_CONTENT_ELEMENTS) &&
        (type->contentType != XML_SCHEMA_CONTENT_MIXED)))
        return;

#ifdef DEBUG_CONTENT
    xmlGenericError(xmlGenericErrorContext,
                    "Building content model for %s\n", name);
#endif
    ctxt->am = NULL;
    ctxt->am = xmlNewAutomata();
    if (ctxt->am == NULL) {
        xmlGenericError(xmlGenericErrorContext,
            "Cannot create automata for complex type %s\n", type->name);
        return;
    }
    ctxt->state = xmlAutomataGetInitState(ctxt->am);
    /*
    * Build the automaton.
    */
    xmlSchemaBuildAContentModel(ctxt, WXS_TYPE_PARTICLE(type));
    xmlAutomataSetFinalState(ctxt->am, ctxt->state);
    type->contModel = xmlAutomataCompile(ctxt->am);
    if (type->contModel == NULL) {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_INTERNAL,
            WXS_BASIC_CAST type, type->node,
            "Failed to compile the content model", NULL);
    } else if (xmlRegexpIsDeterminist(type->contModel) != 1) {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_NOT_DETERMINISTIC,
            /* XML_SCHEMAS_ERR_NOTDETERMINIST, */
            WXS_BASIC_CAST type, type->node,
            "The content model is not determinist", NULL);
    } else {
#ifdef DEBUG_CONTENT_REGEXP
        xmlGenericError(xmlGenericErrorContext,
                        "Content model of %s:\n", type->name);
        xmlRegexpPrint(stderr, type->contModel);
#endif
    }
    ctxt->state = NULL;
    xmlFreeAutomata(ctxt->am);
    ctxt->am = NULL;
}

/**
 * xmlSchemaResolveElementReferences:
 * @elem:  the schema element context
 * @ctxt:  the schema parser context
 *
 * Resolves the references of an element declaration
 * or particle, which has an element declaration as it's
 * term.
 */
static void
xmlSchemaResolveElementReferences(xmlSchemaElementPtr elemDecl,
                                  xmlSchemaParserCtxtPtr ctxt)
{
    if ((ctxt == NULL) || (elemDecl == NULL) ||
        ((elemDecl != NULL) &&
        (elemDecl->flags & XML_SCHEMAS_ELEM_INTERNAL_RESOLVED)))
        return;
    elemDecl->flags |= XML_SCHEMAS_ELEM_INTERNAL_RESOLVED;

    if ((elemDecl->subtypes == NULL) && (elemDecl->namedType != NULL)) {
        xmlSchemaTypePtr type;

        /* (type definition) ... otherwise the type definition ·resolved·
        * to by the ·actual value· of the type [attribute] ...
        */
        type = xmlSchemaGetType(ctxt->schema, elemDecl->namedType,
            elemDecl->namedTypeNs);
        if (type == NULL) {
            xmlSchemaPResCompAttrErr(ctxt,
                XML_SCHEMAP_SRC_RESOLVE,
                WXS_BASIC_CAST elemDecl, elemDecl->node,
                "type", elemDecl->namedType, elemDecl->namedTypeNs,
                XML_SCHEMA_TYPE_BASIC, "type definition");
        } else
            elemDecl->subtypes = type;
    }
    if (elemDecl->substGroup != NULL) {
        xmlSchemaElementPtr substHead;

        /*
        * FIXME TODO: Do we need a new field in _xmlSchemaElement for
        * substitutionGroup?
        */
        substHead = xmlSchemaGetElem(ctxt->schema, elemDecl->substGroup,
            elemDecl->substGroupNs);
        if (substHead == NULL) {
            xmlSchemaPResCompAttrErr(ctxt,
                XML_SCHEMAP_SRC_RESOLVE,
                WXS_BASIC_CAST elemDecl, NULL,
                "substitutionGroup", elemDecl->substGroup,
                elemDecl->substGroupNs, XML_SCHEMA_TYPE_ELEMENT, NULL);
        } else {
            xmlSchemaResolveElementReferences(substHead, ctxt);
            /*
            * Set the "substitution group affiliation".
            * NOTE that now we use the "refDecl" field for this.
            */
            WXS_SUBST_HEAD(elemDecl) = substHead;
            /*
            * The type definitions is set to:
            * SPEC "...the {type definition} of the element
            * declaration ·resolved· to by the ·actual value·
            * of the substitutionGroup [attribute], if present"
            */
            if (elemDecl->subtypes == NULL)
                elemDecl->subtypes = substHead->subtypes;
        }
    }
    /*
    * SPEC "The definition of anyType serves as the default type definition
    * for element declarations whose XML representation does not specify one."
    */
    if ((elemDecl->subtypes == NULL) &&
        (elemDecl->namedType == NULL) &&
        (elemDecl->substGroup == NULL))
        elemDecl->subtypes = xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYTYPE);
}

/**
 * xmlSchemaResolveUnionMemberTypes:
 * @ctxt:  the schema parser context
 * @type:  the schema simple type definition
 *
 * Checks and builds the "member type definitions" property of the union
 * simple type. This handles part (1), part (2) is done in
 * xmlSchemaFinishMemberTypeDefinitionsProperty()
 *
 * Returns -1 in case of an internal error, 0 otherwise.
 */
static int
xmlSchemaResolveUnionMemberTypes(xmlSchemaParserCtxtPtr ctxt,
                                 xmlSchemaTypePtr type)
{

    xmlSchemaTypeLinkPtr link, lastLink, newLink;
    xmlSchemaTypePtr memberType;

    /*
    * SPEC (1) "If the <union> alternative is chosen, then [Definition:]
    * define the explicit members as the type definitions ·resolved·
    * to by the items in the ·actual value· of the memberTypes [attribute],
    * if any, followed by the type definitions corresponding to the
    * <simpleType>s among the [children] of <union>, if any."
    */
    /*
    * Resolve references.
    */
    link = type->memberTypes;
    lastLink = NULL;
    while (link != NULL) {
        const xmlChar *name, *nsName;

        name = ((xmlSchemaQNameRefPtr) link->type)->name;
        nsName = ((xmlSchemaQNameRefPtr) link->type)->targetNamespace;

        memberType = xmlSchemaGetType(ctxt->schema, name, nsName);
        if ((memberType == NULL) || (! WXS_IS_SIMPLE(memberType))) {
            xmlSchemaPResCompAttrErr(ctxt, XML_SCHEMAP_SRC_RESOLVE,
                WXS_BASIC_CAST type, type->node, "memberTypes",
                name, nsName, XML_SCHEMA_TYPE_SIMPLE, NULL);
            /*
            * Remove the member type link.
            */
            if (lastLink == NULL)
                type->memberTypes = link->next;
            else
                lastLink->next = link->next;
            newLink = link;
            link = link->next;
            xmlFree(newLink);
        } else {
            link->type = memberType;
            lastLink = link;
            link = link->next;
        }
    }
    /*
    * Add local simple types,
    */
    memberType = type->subtypes;
    while (memberType != NULL) {
        link = (xmlSchemaTypeLinkPtr) xmlMalloc(sizeof(xmlSchemaTypeLink));
        if (link == NULL) {
            xmlSchemaPErrMemory(ctxt, "allocating a type link", NULL);
            return (-1);
        }
        link->type = memberType;
        link->next = NULL;
        if (lastLink == NULL)
            type->memberTypes = link;
        else
            lastLink->next = link;
        lastLink = link;
        memberType = memberType->next;
    }
    return (0);
}

/**
 * xmlSchemaIsDerivedFromBuiltInType:
 * @ctxt:  the schema parser context
 * @type:  the type definition
 * @valType: the value type
 *
 *
 * Returns 1 if the type has the given value type, or
 * is derived from such a type.
 */
static int
xmlSchemaIsDerivedFromBuiltInType(xmlSchemaTypePtr type, int valType)
{
    if (type == NULL)
        return (0);
    if (WXS_IS_COMPLEX(type))
        return (0);
    if (type->type == XML_SCHEMA_TYPE_BASIC) {
        if (type->builtInType == valType)
            return(1);
        if ((type->builtInType == XML_SCHEMAS_ANYSIMPLETYPE) ||
            (type->builtInType == XML_SCHEMAS_ANYTYPE))
            return (0);
        return(xmlSchemaIsDerivedFromBuiltInType(type->subtypes, valType));
    }
    return(xmlSchemaIsDerivedFromBuiltInType(type->subtypes, valType));
}

#if 0
/**
 * xmlSchemaIsDerivedFromBuiltInType:
 * @ctxt:  the schema parser context
 * @type:  the type definition
 * @valType: the value type
 *
 *
 * Returns 1 if the type has the given value type, or
 * is derived from such a type.
 */
static int
xmlSchemaIsUserDerivedFromBuiltInType(xmlSchemaTypePtr type, int valType)
{
    if (type == NULL)
        return (0);
    if (WXS_IS_COMPLEX(type))
        return (0);
    if (type->type == XML_SCHEMA_TYPE_BASIC) {
        if (type->builtInType == valType)
            return(1);
        return (0);
    } else
        return(xmlSchemaIsDerivedFromBuiltInType(type->subtypes, valType));

    return (0);
}
#endif

static xmlSchemaTypePtr
xmlSchemaQueryBuiltInType(xmlSchemaTypePtr type)
{
    if (type == NULL)
        return (NULL);
    if (WXS_IS_COMPLEX(type))
        return (NULL);
    if (type->type == XML_SCHEMA_TYPE_BASIC)
        return(type);
    return(xmlSchemaQueryBuiltInType(type->subtypes));
}

/**
 * xmlSchemaGetPrimitiveType:
 * @type:  the simpleType definition
 *
 * Returns the primitive type of the given type or
 * NULL in case of error.
 */
static xmlSchemaTypePtr
xmlSchemaGetPrimitiveType(xmlSchemaTypePtr type)
{

    while (type != NULL) {
        /*
        * Note that anySimpleType is actually not a primitive type
        * but we need that here.
        */
        if ((type->builtInType == XML_SCHEMAS_ANYSIMPLETYPE) ||
           (type->flags & XML_SCHEMAS_TYPE_BUILTIN_PRIMITIVE))
            return (type);
        type = type->baseType;
    }

    return (NULL);
}

#if 0
/**
 * xmlSchemaGetBuiltInTypeAncestor:
 * @type:  the simpleType definition
 *
 * Returns the primitive type of the given type or
 * NULL in case of error.
 */
static xmlSchemaTypePtr
xmlSchemaGetBuiltInTypeAncestor(xmlSchemaTypePtr type)
{
    if (WXS_IS_LIST(type) || WXS_IS_UNION(type))
        return (0);
    while (type != NULL) {
        if (type->type == XML_SCHEMA_TYPE_BASIC)
            return (type);
        type = type->baseType;
    }

    return (NULL);
}
#endif

/**
 * xmlSchemaCloneWildcardNsConstraints:
 * @ctxt:  the schema parser context
 * @dest:  the destination wildcard
 * @source: the source wildcard
 *
 * Clones the namespace constraints of source
 * and assignes them to dest.
 * Returns -1 on internal error, 0 otherwise.
 */
static int
xmlSchemaCloneWildcardNsConstraints(xmlSchemaParserCtxtPtr ctxt,
                                    xmlSchemaWildcardPtr dest,
                                    xmlSchemaWildcardPtr source)
{
    xmlSchemaWildcardNsPtr cur, tmp, last;

    if ((source == NULL) || (dest == NULL))
        return(-1);
    dest->any = source->any;
    cur = source->nsSet;
    last = NULL;
    while (cur != NULL) {
        tmp = xmlSchemaNewWildcardNsConstraint(ctxt);
        if (tmp == NULL)
            return(-1);
        tmp->value = cur->value;
        if (last == NULL)
            dest->nsSet = tmp;
        else
            last->next = tmp;
        last = tmp;
        cur = cur->next;
    }
    if (dest->negNsSet != NULL)
        xmlSchemaFreeWildcardNsSet(dest->negNsSet);
    if (source->negNsSet != NULL) {
        dest->negNsSet = xmlSchemaNewWildcardNsConstraint(ctxt);
        if (dest->negNsSet == NULL)
            return(-1);
        dest->negNsSet->value = source->negNsSet->value;
    } else
        dest->negNsSet = NULL;
    return(0);
}

/**
 * xmlSchemaUnionWildcards:
 * @ctxt:  the schema parser context
 * @completeWild:  the first wildcard
 * @curWild: the second wildcard
 *
 * Unions the namespace constraints of the given wildcards.
 * @completeWild will hold the resulting union.
 * Returns a positive error code on failure, -1 in case of an
 * internal error, 0 otherwise.
 */
static int
xmlSchemaUnionWildcards(xmlSchemaParserCtxtPtr ctxt,
                            xmlSchemaWildcardPtr completeWild,
                            xmlSchemaWildcardPtr curWild)
{
    xmlSchemaWildcardNsPtr cur, curB, tmp;

    /*
    * 1 If O1 and O2 are the same value, then that value must be the
    * value.
    */
    if ((completeWild->any == curWild->any) &&
        ((completeWild->nsSet == NULL) == (curWild->nsSet == NULL)) &&
        ((completeWild->negNsSet == NULL) == (curWild->negNsSet == NULL))) {

        if ((completeWild->negNsSet == NULL) ||
            (completeWild->negNsSet->value == curWild->negNsSet->value)) {

            if (completeWild->nsSet != NULL) {
                int found = 0;

                /*
                * Check equality of sets.
                */
                cur = completeWild->nsSet;
                while (cur != NULL) {
                    found = 0;
                    curB = curWild->nsSet;
                    while (curB != NULL) {
                        if (cur->value == curB->value) {
                            found = 1;
                            break;
                        }
                        curB = curB->next;
                    }
                    if (!found)
                        break;
                    cur = cur->next;
                }
                if (found)
                    return(0);
            } else
                return(0);
        }
    }
    /*
    * 2 If either O1 or O2 is any, then any must be the value
    */
    if (completeWild->any != curWild->any) {
        if (completeWild->any == 0) {
            completeWild->any = 1;
            if (completeWild->nsSet != NULL) {
                xmlSchemaFreeWildcardNsSet(completeWild->nsSet);
                completeWild->nsSet = NULL;
            }
            if (completeWild->negNsSet != NULL) {
                xmlFree(completeWild->negNsSet);
                completeWild->negNsSet = NULL;
            }
        }
        return (0);
    }
    /*
    * 3 If both O1 and O2 are sets of (namespace names or ·absent·),
    * then the union of those sets must be the value.
    */
    if ((completeWild->nsSet != NULL) && (curWild->nsSet != NULL)) {
        int found;
        xmlSchemaWildcardNsPtr start;

        cur = curWild->nsSet;
        start = completeWild->nsSet;
        while (cur != NULL) {
            found = 0;
            curB = start;
            while (curB != NULL) {
                if (cur->value == curB->value) {
                    found = 1;
                    break;
                }
                curB = curB->next;
            }
            if (!found) {
                tmp = xmlSchemaNewWildcardNsConstraint(ctxt);
                if (tmp == NULL)
                    return (-1);
                tmp->value = cur->value;
                tmp->next = completeWild->nsSet;
                completeWild->nsSet = tmp;
            }
            cur = cur->next;
        }

        return(0);
    }
    /*
    * 4 If the two are negations of different values (namespace names
    * or ·absent·), then a pair of not and ·absent· must be the value.
    */
    if ((completeWild->negNsSet != NULL) &&
        (curWild->negNsSet != NULL) &&
        (completeWild->negNsSet->value != curWild->negNsSet->value)) {
        completeWild->negNsSet->value = NULL;

        return(0);
    }
    /*
     * 5.
     */
    if (((completeWild->negNsSet != NULL) &&
        (completeWild->negNsSet->value != NULL) &&
        (curWild->nsSet != NULL)) ||
        ((curWild->negNsSet != NULL) &&
        (curWild->negNsSet->value != NULL) &&
        (completeWild->nsSet != NULL))) {

        int nsFound, absentFound = 0;

        if (completeWild->nsSet != NULL) {
            cur = completeWild->nsSet;
            curB = curWild->negNsSet;
        } else {
            cur = curWild->nsSet;
            curB = completeWild->negNsSet;
        }
        nsFound = 0;
        while (cur != NULL) {
            if (cur->value == NULL)
                absentFound = 1;
            else if (cur->value == curB->value)
                nsFound = 1;
            if (nsFound && absentFound)
                break;
            cur = cur->next;
        }

        if (nsFound && absentFound) {
            /*
            * 5.1 If the set S includes both the negated namespace
            * name and ·absent·, then any must be the value.
            */
            completeWild->any = 1;
            if (completeWild->nsSet != NULL) {
                xmlSchemaFreeWildcardNsSet(completeWild->nsSet);
                completeWild->nsSet = NULL;
            }
            if (completeWild->negNsSet != NULL) {
                xmlFree(completeWild->negNsSet);
                completeWild->negNsSet = NULL;
            }
        } else if (nsFound && (!absentFound)) {
            /*
            * 5.2 If the set S includes the negated namespace name
            * but not ·absent·, then a pair of not and ·absent· must
            * be the value.
            */
            if (completeWild->nsSet != NULL) {
                xmlSchemaFreeWildcardNsSet(completeWild->nsSet);
                completeWild->nsSet = NULL;
            }
            if (completeWild->negNsSet == NULL) {
                completeWild->negNsSet = xmlSchemaNewWildcardNsConstraint(ctxt);
                if (completeWild->negNsSet == NULL)
                    return (-1);
            }
            completeWild->negNsSet->value = NULL;
        } else if ((!nsFound) && absentFound) {
            /*
            * 5.3 If the set S includes ·absent· but not the negated
            * namespace name, then the union is not expressible.
            */
            xmlSchemaPErr(ctxt, completeWild->node,
                XML_SCHEMAP_UNION_NOT_EXPRESSIBLE,
                "The union of the wilcard is not expressible.\n",
                NULL, NULL);
            return(XML_SCHEMAP_UNION_NOT_EXPRESSIBLE);
        } else if ((!nsFound) && (!absentFound)) {
            /*
            * 5.4 If the set S does not include either the negated namespace
            * name or ·absent·, then whichever of O1 or O2 is a pair of not
            * and a namespace name must be the value.
            */
            if (completeWild->negNsSet == NULL) {
                if (completeWild->nsSet != NULL) {
                    xmlSchemaFreeWildcardNsSet(completeWild->nsSet);
                    completeWild->nsSet = NULL;
                }
                completeWild->negNsSet = xmlSchemaNewWildcardNsConstraint(ctxt);
                if (completeWild->negNsSet == NULL)
                    return (-1);
                completeWild->negNsSet->value = curWild->negNsSet->value;
            }
        }
        return (0);
    }
    /*
     * 6.
     */
    if (((completeWild->negNsSet != NULL) &&
        (completeWild->negNsSet->value == NULL) &&
        (curWild->nsSet != NULL)) ||
        ((curWild->negNsSet != NULL) &&
        (curWild->negNsSet->value == NULL) &&
        (completeWild->nsSet != NULL))) {

        if (completeWild->nsSet != NULL) {
            cur = completeWild->nsSet;
        } else {
            cur = curWild->nsSet;
        }
        while (cur != NULL) {
            if (cur->value == NULL) {
                /*
                * 6.1 If the set S includes ·absent·, then any must be the
                * value.
                */
                completeWild->any = 1;
                if (completeWild->nsSet != NULL) {
                    xmlSchemaFreeWildcardNsSet(completeWild->nsSet);
                    completeWild->nsSet = NULL;
                }
                if (completeWild->negNsSet != NULL) {
                    xmlFree(completeWild->negNsSet);
                    completeWild->negNsSet = NULL;
                }
                return (0);
            }
            cur = cur->next;
        }
        if (completeWild->negNsSet == NULL) {
            /*
            * 6.2 If the set S does not include ·absent·, then a pair of not
            * and ·absent· must be the value.
            */
            if (completeWild->nsSet != NULL) {
                xmlSchemaFreeWildcardNsSet(completeWild->nsSet);
                completeWild->nsSet = NULL;
            }
            completeWild->negNsSet = xmlSchemaNewWildcardNsConstraint(ctxt);
            if (completeWild->negNsSet == NULL)
                return (-1);
            completeWild->negNsSet->value = NULL;
        }
        return (0);
    }
    return (0);

}

/**
 * xmlSchemaIntersectWildcards:
 * @ctxt:  the schema parser context
 * @completeWild:  the first wildcard
 * @curWild: the second wildcard
 *
 * Intersects the namespace constraints of the given wildcards.
 * @completeWild will hold the resulting intersection.
 * Returns a positive error code on failure, -1 in case of an
 * internal error, 0 otherwise.
 */
static int
xmlSchemaIntersectWildcards(xmlSchemaParserCtxtPtr ctxt,
                            xmlSchemaWildcardPtr completeWild,
                            xmlSchemaWildcardPtr curWild)
{
    xmlSchemaWildcardNsPtr cur, curB, prev,  tmp;

    /*
    * 1 If O1 and O2 are the same value, then that value must be the
    * value.
    */
    if ((completeWild->any == curWild->any) &&
        ((completeWild->nsSet == NULL) == (curWild->nsSet == NULL)) &&
        ((completeWild->negNsSet == NULL) == (curWild->negNsSet == NULL))) {

        if ((completeWild->negNsSet == NULL) ||
            (completeWild->negNsSet->value == curWild->negNsSet->value)) {

            if (completeWild->nsSet != NULL) {
                int found = 0;

                /*
                * Check equality of sets.
                */
                cur = completeWild->nsSet;
                while (cur != NULL) {
                    found = 0;
                    curB = curWild->nsSet;
                    while (curB != NULL) {
                        if (cur->value == curB->value) {
                            found = 1;
                            break;
                        }
                        curB = curB->next;
                    }
                    if (!found)
                        break;
                    cur = cur->next;
                }
                if (found)
                    return(0);
            } else
                return(0);
        }
    }
    /*
    * 2 If either O1 or O2 is any, then the other must be the value.
    */
    if ((completeWild->any != curWild->any) && (completeWild->any)) {
        if (xmlSchemaCloneWildcardNsConstraints(ctxt, completeWild, curWild) == -1)
            return(-1);
        return(0);
    }
    /*
    * 3 If either O1 or O2 is a pair of not and a value (a namespace
    * name or ·absent·) and the other is a set of (namespace names or
    * ·absent·), then that set, minus the negated value if it was in
    * the set, minus ·absent· if it was in the set, must be the value.
    */
    if (((completeWild->negNsSet != NULL) && (curWild->nsSet != NULL)) ||
        ((curWild->negNsSet != NULL) && (completeWild->nsSet != NULL))) {
        const xmlChar *neg;

        if (completeWild->nsSet == NULL) {
            neg = completeWild->negNsSet->value;
            if (xmlSchemaCloneWildcardNsConstraints(ctxt, completeWild, curWild) == -1)
                return(-1);
        } else
            neg = curWild->negNsSet->value;
        /*
        * Remove absent and negated.
        */
        prev = NULL;
        cur = completeWild->nsSet;
        while (cur != NULL) {
            if (cur->value == NULL) {
                if (prev == NULL)
                    completeWild->nsSet = cur->next;
                else
                    prev->next = cur->next;
                xmlFree(cur);
                break;
            }
            prev = cur;
            cur = cur->next;
        }
        if (neg != NULL) {
            prev = NULL;
            cur = completeWild->nsSet;
            while (cur != NULL) {
                if (cur->value == neg) {
                    if (prev == NULL)
                        completeWild->nsSet = cur->next;
                    else
                        prev->next = cur->next;
                    xmlFree(cur);
                    break;
                }
                prev = cur;
                cur = cur->next;
            }
        }

        return(0);
    }
    /*
    * 4 If both O1 and O2 are sets of (namespace names or ·absent·),
    * then the intersection of those sets must be the value.
    */
    if ((completeWild->nsSet != NULL) && (curWild->nsSet != NULL)) {
        int found;

        cur = completeWild->nsSet;
        prev = NULL;
        while (cur != NULL) {
            found = 0;
            curB = curWild->nsSet;
            while (curB != NULL) {
                if (cur->value == curB->value) {
                    found = 1;
                    break;
                }
                curB = curB->next;
            }
            if (!found) {
                if (prev == NULL)
                    completeWild->nsSet = cur->next;
                else
                    prev->next = cur->next;
                tmp = cur->next;
                xmlFree(cur);
                cur = tmp;
                continue;
            }
            prev = cur;
            cur = cur->next;
        }

        return(0);
    }
    /* 5 If the two are negations of different namespace names,
    * then the intersection is not expressible
    */
    if ((completeWild->negNsSet != NULL) &&
        (curWild->negNsSet != NULL) &&
        (completeWild->negNsSet->value != curWild->negNsSet->value) &&
        (completeWild->negNsSet->value != NULL) &&
        (curWild->negNsSet->value != NULL)) {

        xmlSchemaPErr(ctxt, completeWild->node, XML_SCHEMAP_INTERSECTION_NOT_EXPRESSIBLE,
            "The intersection of the wilcard is not expressible.\n",
            NULL, NULL);
        return(XML_SCHEMAP_INTERSECTION_NOT_EXPRESSIBLE);
    }
    /*
    * 6 If the one is a negation of a namespace name and the other
    * is a negation of ·absent·, then the one which is the negation
    * of a namespace name must be the value.
    */
    if ((completeWild->negNsSet != NULL) && (curWild->negNsSet != NULL) &&
        (completeWild->negNsSet->value != curWild->negNsSet->value) &&
        (completeWild->negNsSet->value == NULL)) {
        completeWild->negNsSet->value =  curWild->negNsSet->value;
    }
    return(0);
}

/**
 * xmlSchemaIsWildcardNsConstraintSubset:
 * @ctxt:  the schema parser context
 * @sub:  the first wildcard
 * @super: the second wildcard
 *
 * Schema Component Constraint: Wildcard Subset (cos-ns-subset)
 *
 * Returns 0 if the namespace constraint of @sub is an intensional
 * subset of @super, 1 otherwise.
 */
static int
xmlSchemaCheckCOSNSSubset(xmlSchemaWildcardPtr sub,
                          xmlSchemaWildcardPtr super)
{
    /*
    * 1 super must be any.
    */
    if (super->any)
        return (0);
    /*
    * 2.1 sub must be a pair of not and a namespace name or ·absent·.
    * 2.2 super must be a pair of not and the same value.
    */
    if ((sub->negNsSet != NULL) &&
        (super->negNsSet != NULL) &&
        (sub->negNsSet->value == sub->negNsSet->value))
        return (0);
    /*
    * 3.1 sub must be a set whose members are either namespace names or ·absent·.
    */
    if (sub->nsSet != NULL) {
        /*
        * 3.2.1 super must be the same set or a superset thereof.
        */
        if (super->nsSet != NULL) {
            xmlSchemaWildcardNsPtr cur, curB;
            int found = 0;

            cur = sub->nsSet;
            while (cur != NULL) {
                found = 0;
                curB = super->nsSet;
                while (curB != NULL) {
                    if (cur->value == curB->value) {
                        found = 1;
                        break;
                    }
                    curB = curB->next;
                }
                if (!found)
                    return (1);
                cur = cur->next;
            }
            if (found)
                return (0);
        } else if (super->negNsSet != NULL) {
            xmlSchemaWildcardNsPtr cur;
            /*
            * 3.2.2 super must be a pair of not and a namespace name or
            * ·absent· and that value must not be in sub's set.
            */
            cur = sub->nsSet;
            while (cur != NULL) {
                if (cur->value == super->negNsSet->value)
                    return (1);
                cur = cur->next;
            }
            return (0);
        }
    }
    return (1);
}

static int
xmlSchemaGetEffectiveValueConstraint(xmlSchemaAttributeUsePtr attruse,
                                     int *fixed,
                                     const xmlChar **value,
                                     xmlSchemaValPtr *val)
{
    *fixed = 0;
    *value = NULL;
    if (val != 0)
        *val = NULL;

    if (attruse->defValue != NULL) {        
        *value = attruse->defValue;
        if (val != NULL)
            *val = attruse->defVal;
        if (attruse->flags & XML_SCHEMA_ATTR_USE_FIXED)
            *fixed = 1;
        return(1);
    } else if ((attruse->attrDecl != NULL) &&
        (attruse->attrDecl->defValue != NULL)) {
        *value = attruse->attrDecl->defValue;
        if (val != NULL)
            *val = attruse->attrDecl->defVal;
        if (attruse->attrDecl->flags & XML_SCHEMAS_ATTR_FIXED)
            *fixed = 1;
        return(1);
    }
    return(0);
}
/**
 * xmlSchemaCheckCVCWildcardNamespace:
 * @wild:  the wildcard
 * @ns:  the namespace
 *
 * Validation Rule: Wildcard allows Namespace Name
 * (cvc-wildcard-namespace)
 *
 * Returns 0 if the given namespace matches the wildcard,
 * 1 otherwise and -1 on API errors.
 */
static int
xmlSchemaCheckCVCWildcardNamespace(xmlSchemaWildcardPtr wild,
                                   const xmlChar* ns)
{
    if (wild == NULL)
        return(-1);

    if (wild->any)
        return(0);
    else if (wild->nsSet != NULL) {
        xmlSchemaWildcardNsPtr cur;

        cur = wild->nsSet;
        while (cur != NULL) {
            if (xmlStrEqual(cur->value, ns))
                return(0);
            cur = cur->next;
        }
    } else if ((wild->negNsSet != NULL) && (ns != NULL) &&
        (!xmlStrEqual(wild->negNsSet->value, ns)))
        return(0);

    return(1);
}

#define XML_SCHEMA_ACTION_DERIVE 0
#define XML_SCHEMA_ACTION_REDEFINE 1

#define WXS_ACTION_STR(a) \
((a) == XML_SCHEMA_ACTION_DERIVE) ? (const xmlChar *) "base" : (const xmlChar *) "redefined"

/*
* Schema Component Constraint:
*   Derivation Valid (Restriction, Complex)
*   derivation-ok-restriction (2) - (4)
*
* ATTENTION:
* In XML Schema 1.1 this will be:
* Validation Rule:
*     Checking complex type subsumption (practicalSubsumption) (1, 2 and 3)
*
*/
static int
xmlSchemaCheckDerivationOKRestriction2to4(xmlSchemaParserCtxtPtr pctxt,
                                       int action,
                                       xmlSchemaBasicItemPtr item,
                                       xmlSchemaBasicItemPtr baseItem,
                                       xmlSchemaItemListPtr uses,
                                       xmlSchemaItemListPtr baseUses,
                                       xmlSchemaWildcardPtr wild,
                                       xmlSchemaWildcardPtr baseWild)
{        
    xmlSchemaAttributeUsePtr cur = NULL, bcur;
    int i, j, found; /* err = 0; */
    const xmlChar *bEffValue;
    int effFixed;
    
    if (uses != NULL) {
        for (i = 0; i < uses->nbItems; i++) {
            cur = uses->items[i];
            found = 0;
            if (baseUses == NULL)
                goto not_found;
            for (j = 0; j < baseUses->nbItems; j++) {
                bcur = baseUses->items[j];      
                if ((WXS_ATTRUSE_DECL_NAME(cur) ==
                        WXS_ATTRUSE_DECL_NAME(bcur)) &&
                    (WXS_ATTRUSE_DECL_TNS(cur) ==
                        WXS_ATTRUSE_DECL_TNS(bcur)))
                {
                    /*
                    * (2.1) "If there is an attribute use in the {attribute
                    * uses} of the {base type definition} (call this B) whose
                    * {attribute declaration} has the same {name} and {target
                    * namespace}, then  all of the following must be true:"
                    */
                    found = 1;
                    
                    if ((cur->occurs == XML_SCHEMAS_ATTR_USE_OPTIONAL) &&
                        (bcur->occurs == XML_SCHEMAS_ATTR_USE_REQUIRED))
                    {
                        xmlChar *str = NULL;
                        /*
                        * (2.1.1) "one of the following must be true:"
                        * (2.1.1.1) "B's {required} is false."
                        * (2.1.1.2) "R's {required} is true."
                        */
                        xmlSchemaPAttrUseErr4(pctxt,
                            XML_SCHEMAP_DERIVATION_OK_RESTRICTION_2_1_1,
                            WXS_ITEM_NODE(item), item, cur,
                            "The 'optional' attribute use is inconsistent "
                            "with the corresponding 'required' attribute use of "
                            "the %s %s",
                            WXS_ACTION_STR(action),
                            xmlSchemaGetComponentDesignation(&str, baseItem),
                            NULL, NULL);
                        FREE_AND_NULL(str);
                        /* err = pctxt->err; */
                    } else if (xmlSchemaCheckCOSSTDerivedOK(ACTXT_CAST pctxt,
                        WXS_ATTRUSE_TYPEDEF(cur),
                        WXS_ATTRUSE_TYPEDEF(bcur), 0) != 0)
                    {
                        xmlChar *strA = NULL, *strB = NULL, *strC = NULL;
                        
                        /*
                        * SPEC (2.1.2) "R's {attribute declaration}'s
                        * {type definition} must be validly derived from
                        * B's {type definition} given the empty set as
                        * defined in Type Derivation OK (Simple) (§3.14.6)."
                        */
                        xmlSchemaPAttrUseErr4(pctxt,
                            XML_SCHEMAP_DERIVATION_OK_RESTRICTION_2_1_2,
                            WXS_ITEM_NODE(item), item, cur,
                            "The attribute declaration's %s "
                            "is not validly derived from "
                            "the corresponding %s of the "
                            "attribute declaration in the %s %s",
                            xmlSchemaGetComponentDesignation(&strA,
                                WXS_ATTRUSE_TYPEDEF(cur)),
                            xmlSchemaGetComponentDesignation(&strB,
                                WXS_ATTRUSE_TYPEDEF(bcur)),
                            WXS_ACTION_STR(action),
                            xmlSchemaGetComponentDesignation(&strC, baseItem));
                            /* xmlSchemaGetComponentDesignation(&str, baseItem), */
                        FREE_AND_NULL(strA);
                        FREE_AND_NULL(strB);
                        FREE_AND_NULL(strC);
                        /* err = pctxt->err; */
                    } else {
                        /*
                        * 2.1.3 [Definition:]  Let the effective value
                        * constraint of an attribute use be its {value
                        * constraint}, if present, otherwise its {attribute
                        * declaration}'s {value constraint} .
                        */
                        xmlSchemaGetEffectiveValueConstraint(bcur,
                            &effFixed, &bEffValue, NULL);
                        /*
                        * 2.1.3 ... one of the following must be true
                        *
                        * 2.1.3.1 B's ·effective value constraint· is
                        * ·absent· or default.
                        */
                        if ((bEffValue != NULL) &&
                            (effFixed == 1)) {
                            const xmlChar *rEffValue = NULL;
                            
                            xmlSchemaGetEffectiveValueConstraint(bcur,
                                &effFixed, &rEffValue, NULL);
                            /*
                            * 2.1.3.2 R's ·effective value constraint· is
                            * fixed with the same string as B's.
                            * MAYBE TODO: Compare the computed values.
                            *       Hmm, it says "same string" so
                            *       string-equality might really be sufficient.
                            */
                            if ((effFixed == 0) ||
                                (! WXS_ARE_DEFAULT_STR_EQUAL(rEffValue, bEffValue)))
                            {
                                xmlChar *str = NULL;
                                
                                xmlSchemaPAttrUseErr4(pctxt,
                                    XML_SCHEMAP_DERIVATION_OK_RESTRICTION_2_1_3,
                                    WXS_ITEM_NODE(item), item, cur,
                                    "The effective value constraint of the "
                                    "attribute use is inconsistent with "
                                    "its correspondent in the %s %s",
                                    WXS_ACTION_STR(action),
                                    xmlSchemaGetComponentDesignation(&str,
                                        baseItem),
                                    NULL, NULL);
                                FREE_AND_NULL(str);
                                /* err = pctxt->err; */
                            }
                        }
                    }
                    break;
                }
            }
not_found:      
            if (!found) {
                /*
                * (2.2) "otherwise the {base type definition} must have an
                * {attribute wildcard} and the {target namespace} of the
                * R's {attribute declaration} must be ·valid· with respect
                * to that wildcard, as defined in Wildcard allows Namespace
                * Name (§3.10.4)."
                */
                if ((baseWild == NULL) ||
                    (xmlSchemaCheckCVCWildcardNamespace(baseWild,
                    (WXS_ATTRUSE_DECL(cur))->targetNamespace) != 0))
                {
                    xmlChar *str = NULL;
                    
                    xmlSchemaPAttrUseErr4(pctxt,
                        XML_SCHEMAP_DERIVATION_OK_RESTRICTION_2_2,
                        WXS_ITEM_NODE(item), item, cur,
                        "Neither a matching attribute use, "
                        "nor a matching wildcard exists in the %s %s",
                        WXS_ACTION_STR(action),
                        xmlSchemaGetComponentDesignation(&str, baseItem),
                        NULL, NULL);
                    FREE_AND_NULL(str);
                    /* err = pctxt->err; */
                }
            }
        }
    }
    /*
    * SPEC derivation-ok-restriction (3):    
    * (3) "For each attribute use in the {attribute uses} of the {base type
    * definition} whose {required} is true, there must be an attribute
    * use with an {attribute declaration} with the same {name} and
    * {target namespace} as its {attribute declaration} in the {attribute
    * uses} of the complex type definition itself whose {required} is true.
    */
    if (baseUses != NULL) {
        for (j = 0; j < baseUses->nbItems; j++) {
            bcur = baseUses->items[j];
            if (bcur->occurs != XML_SCHEMAS_ATTR_USE_REQUIRED)
                continue;
            found = 0;
            if (uses != NULL) {
                for (i = 0; i < uses->nbItems; i++) {
                    cur = uses->items[i];       
                    if ((WXS_ATTRUSE_DECL_NAME(cur) ==
                        WXS_ATTRUSE_DECL_NAME(bcur)) &&
                        (WXS_ATTRUSE_DECL_TNS(cur) ==
                        WXS_ATTRUSE_DECL_TNS(bcur))) {
                        found = 1;
                        break;
                    }
                }
            }
            if (!found) {
                xmlChar *strA = NULL, *strB = NULL;
                
                xmlSchemaCustomErr4(ACTXT_CAST pctxt,
                    XML_SCHEMAP_DERIVATION_OK_RESTRICTION_3,
                    NULL, item,
                    "A matching attribute use for the "
                    "'required' %s of the %s %s is missing",
                    xmlSchemaGetComponentDesignation(&strA, bcur),
                    WXS_ACTION_STR(action),
                    xmlSchemaGetComponentDesignation(&strB, baseItem),
                    NULL);
                FREE_AND_NULL(strA);
                FREE_AND_NULL(strB);
            }
        }
    }
    /*
    * derivation-ok-restriction (4)
    */
    if (wild != NULL) {
        /*
        * (4) "If there is an {attribute wildcard}, all of the
        * following must be true:"
        */   
        if (baseWild == NULL) {
            xmlChar *str = NULL;

            /*
            * (4.1) "The {base type definition} must also have one."
            */      
            xmlSchemaCustomErr4(ACTXT_CAST pctxt,
                XML_SCHEMAP_DERIVATION_OK_RESTRICTION_4_1,
                NULL, item,
                "The %s has an attribute wildcard, "
                "but the %s %s '%s' does not have one",
                WXS_ITEM_TYPE_NAME(item),                   
                WXS_ACTION_STR(action),
                WXS_ITEM_TYPE_NAME(baseItem),
                xmlSchemaGetComponentQName(&str, baseItem));
            FREE_AND_NULL(str);
            return(pctxt->err);
        } else if ((baseWild->any == 0) &&
                xmlSchemaCheckCOSNSSubset(wild, baseWild))
        {
            xmlChar *str = NULL;
            /*
            * (4.2) "The complex type definition's {attribute wildcard}'s
            * {namespace constraint} must be a subset of the {base type
            * definition}'s {attribute wildcard}'s {namespace constraint},
            * as defined by Wildcard Subset (§3.10.6)."
            */
            xmlSchemaCustomErr4(ACTXT_CAST pctxt,
                XML_SCHEMAP_DERIVATION_OK_RESTRICTION_4_2,
                NULL, item,
                "The attribute wildcard is not a valid "
                "subset of the wildcard in the %s %s '%s'",
                WXS_ACTION_STR(action),
                WXS_ITEM_TYPE_NAME(baseItem),
                xmlSchemaGetComponentQName(&str, baseItem),
                NULL);
            FREE_AND_NULL(str);
            return(pctxt->err);
        }
        /* 4.3 Unless the {base type definition} is the ·ur-type
        * definition·, the complex type definition's {attribute
        * wildcard}'s {process contents} must be identical to or
        * stronger than the {base type definition}'s {attribute
        * wildcard}'s {process contents}, where strict is stronger
        * than lax is stronger than skip.
        */
        if ((! WXS_IS_ANYTYPE(baseItem)) &&
            (wild->processContents < baseWild->processContents)) {
            xmlChar *str = NULL;
            xmlSchemaCustomErr4(ACTXT_CAST pctxt,
                XML_SCHEMAP_DERIVATION_OK_RESTRICTION_4_3,
                NULL, baseItem,
                "The {process contents} of the attribute wildcard is "
                "weaker than the one in the %s %s '%s'",
                WXS_ACTION_STR(action),
                WXS_ITEM_TYPE_NAME(baseItem),
                xmlSchemaGetComponentQName(&str, baseItem),
                NULL);
            FREE_AND_NULL(str)
                return(pctxt->err);
        }
    }
    return(0);
}


static int
xmlSchemaExpandAttributeGroupRefs(xmlSchemaParserCtxtPtr pctxt,
                                  xmlSchemaBasicItemPtr item,
                                  xmlSchemaWildcardPtr *completeWild,
                                  xmlSchemaItemListPtr list,
                                  xmlSchemaItemListPtr prohibs);
/**
 * xmlSchemaFixupTypeAttributeUses:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 *
 *
 * Builds the wildcard and the attribute uses on the given complex type.
 * Returns -1 if an internal error occurs, 0 otherwise.
 *
 * ATTENTION TODO: Experimantally this uses pointer comparisons for
 * strings, so recheck this if we start to hardcode some schemata, since
 * they might not be in the same dict.
 * NOTE: It is allowed to "extend" the xs:anyType type.
 */
static int
xmlSchemaFixupTypeAttributeUses(xmlSchemaParserCtxtPtr pctxt,
                                  xmlSchemaTypePtr type)
{
    xmlSchemaTypePtr baseType = NULL;
    xmlSchemaAttributeUsePtr use;    
    xmlSchemaItemListPtr uses, baseUses, prohibs = NULL;

    if (type->baseType == NULL) {
        PERROR_INT("xmlSchemaFixupTypeAttributeUses",
            "no base type");
        return (-1);
    }
    baseType = type->baseType;        
    if (WXS_IS_TYPE_NOT_FIXED(baseType))
        if (xmlSchemaTypeFixup(baseType, ACTXT_CAST pctxt) == -1)
            return(-1);

    uses = type->attrUses;
    baseUses = baseType->attrUses;
    /*
    * Expand attribute group references. And build the 'complete'
    * wildcard, i.e. intersect multiple wildcards.
    * Move attribute prohibitions into a separate list.
    */
    if (uses != NULL) { 
        if (WXS_IS_RESTRICTION(type)) {
            /*
            * This one will transfer all attr. prohibitions
            * into pctxt->attrProhibs.
            */
            if (xmlSchemaExpandAttributeGroupRefs(pctxt,
                WXS_BASIC_CAST type, &(type->attributeWildcard), uses,
                pctxt->attrProhibs) == -1)
            {
                PERROR_INT("xmlSchemaFixupTypeAttributeUses",
                "failed to expand attributes");
            }
            if (pctxt->attrProhibs->nbItems != 0)
                prohibs = pctxt->attrProhibs;
        } else {
            if (xmlSchemaExpandAttributeGroupRefs(pctxt,
                WXS_BASIC_CAST type, &(type->attributeWildcard), uses,
                NULL) == -1)
            {
                PERROR_INT("xmlSchemaFixupTypeAttributeUses",
                "failed to expand attributes");
            }
        }
    }
    /*
    * Inherit the attribute uses of the base type.
    */
    if (baseUses != NULL) {
        int i, j;
        xmlSchemaAttributeUseProhibPtr pro;

        if (WXS_IS_RESTRICTION(type)) {
            int usesCount;
            xmlSchemaAttributeUsePtr tmp; 

            if (uses != NULL)
                usesCount = uses->nbItems;
            else
                usesCount = 0;

            /* Restriction. */
            for (i = 0; i < baseUses->nbItems; i++) {
                use = baseUses->items[i];
                if (prohibs) {
                    /*
                    * Filter out prohibited uses.
                    */
                    for (j = 0; j < prohibs->nbItems; j++) {
                        pro = prohibs->items[j];
                        if ((WXS_ATTRUSE_DECL_NAME(use) == pro->name) &&
                            (WXS_ATTRUSE_DECL_TNS(use) ==
                                pro->targetNamespace))
                        {
                            goto inherit_next;
                        }
                    }
                }
                if (usesCount) {
                    /*
                    * Filter out existing uses.
                    */
                    for (j = 0; j < usesCount; j++) {
                        tmp = uses->items[j];
                        if ((WXS_ATTRUSE_DECL_NAME(use) ==
                                WXS_ATTRUSE_DECL_NAME(tmp)) &&
                            (WXS_ATTRUSE_DECL_TNS(use) ==
                                WXS_ATTRUSE_DECL_TNS(tmp)))
                        {
                            goto inherit_next;
                        }
                    }
                }
                if (uses == NULL) {
                    type->attrUses = xmlSchemaItemListCreate();
                    if (type->attrUses == NULL)
                        goto exit_failure;
                    uses = type->attrUses;
                }
                xmlSchemaItemListAddSize(uses, 2, use);
inherit_next: {}
            }
        } else {
            /* Extension. */
            for (i = 0; i < baseUses->nbItems; i++) {       
                use = baseUses->items[i];               
                if (uses == NULL) {
                    type->attrUses = xmlSchemaItemListCreate();
                    if (type->attrUses == NULL)
                        goto exit_failure;
                    uses = type->attrUses;
                }
                xmlSchemaItemListAddSize(uses, baseUses->nbItems, use); 
            }
        }
    }
    /*
    * Shrink attr. uses.
    */
    if (uses) {
        if (uses->nbItems == 0) {
            xmlSchemaItemListFree(uses);
            type->attrUses = NULL;
        }
        /*
        * TODO: We could shrink the size of the array
        * to fit the actual number of items.
        */
    }
    /*
    * Compute the complete wildcard.
    */
    if (WXS_IS_EXTENSION(type)) {       
        if (baseType->attributeWildcard != NULL) {
            /*
            * (3.2.2.1) "If the ·base wildcard· is non-·absent·, then
            * the appropriate case among the following:"
            */
            if (type->attributeWildcard != NULL) {
                /*
                * Union the complete wildcard with the base wildcard.
                * SPEC {attribute wildcard}
                * (3.2.2.1.2) "otherwise a wildcard whose {process contents}
                * and {annotation} are those of the ·complete wildcard·,
                * and whose {namespace constraint} is the intensional union
                * of the {namespace constraint} of the ·complete wildcard·
                * and of the ·base wildcard·, as defined in Attribute
                * Wildcard Union (§3.10.6)."
                */
                if (xmlSchemaUnionWildcards(pctxt, type->attributeWildcard,
                    baseType->attributeWildcard) == -1)
                    goto exit_failure;          
            } else {
                /*
                * (3.2.2.1.1) "If the ·complete wildcard· is ·absent·,
                * then the ·base wildcard·."
                */
                type->attributeWildcard = baseType->attributeWildcard;
            }    
        } else {
            /*
            * (3.2.2.2) "otherwise (the ·base wildcard· is ·absent·) the
            * ·complete wildcard"
            * NOOP
            */
        }
    } else {
        /*
        * SPEC {attribute wildcard}
        * (3.1) "If the <restriction> alternative is chosen, then the
        * ·complete wildcard·;"
        * NOOP
        */
    }
    
    return (0);

exit_failure:
    return(-1);
}

/**
 * xmlSchemaTypeFinalContains:
 * @schema:  the schema
 * @type:  the type definition
 * @final: the final
 *
 * Evaluates if a type definition contains the given "final".
 * This does take "finalDefault" into account as well.
 *
 * Returns 1 if the type does containt the given "final",
 * 0 otherwise.
 */
static int
xmlSchemaTypeFinalContains(xmlSchemaTypePtr type, int final)
{
    if (type == NULL)
        return (0);
    if (type->flags & final)
        return (1);
    else
        return (0);
}

/**
 * xmlSchemaGetUnionSimpleTypeMemberTypes:
 * @type:  the Union Simple Type
 *
 * Returns a list of member types of @type if existing,
 * returns NULL otherwise.
 */
static xmlSchemaTypeLinkPtr
xmlSchemaGetUnionSimpleTypeMemberTypes(xmlSchemaTypePtr type)
{
    while ((type != NULL) && (type->type == XML_SCHEMA_TYPE_SIMPLE)) {
        if (type->memberTypes != NULL)
            return (type->memberTypes);
        else
            type = type->baseType;
    }
    return (NULL);
}

/**
 * xmlSchemaGetParticleTotalRangeMin:
 * @particle: the particle
 *
 * Schema Component Constraint: Effective Total Range
 * (all and sequence) + (choice)
 *
 * Returns the minimun Effective Total Range.
 */
static int
xmlSchemaGetParticleTotalRangeMin(xmlSchemaParticlePtr particle)
{
    if ((particle->children == NULL) ||
        (particle->minOccurs == 0))
        return (0);
    if (particle->children->type == XML_SCHEMA_TYPE_CHOICE) {
        int min = -1, cur;
        xmlSchemaParticlePtr part =
            (xmlSchemaParticlePtr) particle->children->children;

        if (part == NULL)
            return (0);
        while (part != NULL) {
            if ((part->children->type == XML_SCHEMA_TYPE_ELEMENT) ||
                (part->children->type == XML_SCHEMA_TYPE_ANY))
                cur = part->minOccurs;
            else
                cur = xmlSchemaGetParticleTotalRangeMin(part);
            if (cur == 0)
                return (0);
            if ((min > cur) || (min == -1))
                min = cur;
            part = (xmlSchemaParticlePtr) part->next;
        }
        return (particle->minOccurs * min);
    } else {
        /* <all> and <sequence> */
        int sum = 0;
        xmlSchemaParticlePtr part =
            (xmlSchemaParticlePtr) particle->children->children;

        if (part == NULL)
            return (0);
        do {
            if ((part->children->type == XML_SCHEMA_TYPE_ELEMENT) ||
                (part->children->type == XML_SCHEMA_TYPE_ANY))
                sum += part->minOccurs;
            else
                sum += xmlSchemaGetParticleTotalRangeMin(part);
            part = (xmlSchemaParticlePtr) part->next;
        } while (part != NULL);
        return (particle->minOccurs * sum);
    }
}

/**
 * xmlSchemaGetParticleTotalRangeMax:
 * @particle: the particle
 *
 * Schema Component Constraint: Effective Total Range
 * (all and sequence) + (choice)
 *
 * Returns the maximum Effective Total Range.
 */
static int
xmlSchemaGetParticleTotalRangeMax(xmlSchemaParticlePtr particle)
{
    if ((particle->children == NULL) ||
        (particle->children->children == NULL))
        return (0);
    if (particle->children->type == XML_SCHEMA_TYPE_CHOICE) {
        int max = -1, cur;
        xmlSchemaParticlePtr part =
            (xmlSchemaParticlePtr) particle->children->children;

        for (; part != NULL; part = (xmlSchemaParticlePtr) part->next) {
            if (part->children == NULL)
                continue;
            if ((part->children->type == XML_SCHEMA_TYPE_ELEMENT) ||
                (part->children->type == XML_SCHEMA_TYPE_ANY))
                cur = part->maxOccurs;
            else
                cur = xmlSchemaGetParticleTotalRangeMax(part);
            if (cur == UNBOUNDED)
                return (UNBOUNDED);
            if ((max < cur) || (max == -1))
                max = cur;
        }
        /* TODO: Handle overflows? */
        return (particle->maxOccurs * max);
    } else {
        /* <all> and <sequence> */
        int sum = 0, cur;
        xmlSchemaParticlePtr part =
            (xmlSchemaParticlePtr) particle->children->children;

        for (; part != NULL; part = (xmlSchemaParticlePtr) part->next) {
            if (part->children == NULL)
                continue;
            if ((part->children->type == XML_SCHEMA_TYPE_ELEMENT) ||
                (part->children->type == XML_SCHEMA_TYPE_ANY))
                cur = part->maxOccurs;
            else
                cur = xmlSchemaGetParticleTotalRangeMax(part);
            if (cur == UNBOUNDED)
                return (UNBOUNDED);
            if ((cur > 0) && (particle->maxOccurs == UNBOUNDED))
                return (UNBOUNDED);
            sum += cur;
        }
        /* TODO: Handle overflows? */
        return (particle->maxOccurs * sum);
    }
}

/**
 * xmlSchemaIsParticleEmptiable:
 * @particle: the particle
 *
 * Schema Component Constraint: Particle Emptiable
 * Checks whether the given particle is emptiable.
 *
 * Returns 1 if emptiable, 0 otherwise.
 */
static int
xmlSchemaIsParticleEmptiable(xmlSchemaParticlePtr particle)
{
    /*
    * SPEC (1) "Its {min occurs} is 0."
    */
    if ((particle == NULL) || (particle->minOccurs == 0) ||
        (particle->children == NULL))
        return (1);
    /*
    * SPEC (2) "Its {term} is a group and the minimum part of the
    * effective total range of that group, [...] is 0."
    */
    if (WXS_IS_MODEL_GROUP(particle->children)) {
        if (xmlSchemaGetParticleTotalRangeMin(particle) == 0)
            return (1);
    }
    return (0);
}

/**
 * xmlSchemaCheckCOSSTDerivedOK:
 * @actxt: a context
 * @type:  the derived simple type definition
 * @baseType:  the base type definition
 * @subset: the subset of ('restriction', ect.)
 *
 * Schema Component Constraint:
 * Type Derivation OK (Simple) (cos-st-derived-OK)
 *
 * Checks whether @type can be validly
 * derived from @baseType.
 *
 * Returns 0 on success, an positive error code otherwise.
 */
static int
xmlSchemaCheckCOSSTDerivedOK(xmlSchemaAbstractCtxtPtr actxt,
                             xmlSchemaTypePtr type,
                             xmlSchemaTypePtr baseType,
                             int subset)
{
    /*
    * 1 They are the same type definition.
    * TODO: The identy check might have to be more complex than this.
    */
    if (type == baseType)
        return (0);
    /*
    * 2.1 restriction is not in the subset, or in the {final}
    * of its own {base type definition};
    *
    * NOTE that this will be used also via "xsi:type".
    *
    * TODO: Revise this, it looks strange. How can the "type"
    * not be fixed or *in* fixing?
    */
    if (WXS_IS_TYPE_NOT_FIXED(type))
        if (xmlSchemaTypeFixup(type, actxt) == -1)
            return(-1);
    if (WXS_IS_TYPE_NOT_FIXED(baseType))
        if (xmlSchemaTypeFixup(baseType, actxt) == -1)
            return(-1);
    if ((subset & SUBSET_RESTRICTION) ||
        (xmlSchemaTypeFinalContains(type->baseType,
            XML_SCHEMAS_TYPE_FINAL_RESTRICTION))) {
        return (XML_SCHEMAP_COS_ST_DERIVED_OK_2_1);
    }
    /* 2.2 */
    if (type->baseType == baseType) {
        /*
        * 2.2.1 D's ·base type definition· is B.
        */
        return (0);
    }
    /*
    * 2.2.2 D's ·base type definition· is not the ·ur-type definition·
    * and is validly derived from B given the subset, as defined by this
    * constraint.
    */
    if ((! WXS_IS_ANYTYPE(type->baseType)) &&
        (xmlSchemaCheckCOSSTDerivedOK(actxt, type->baseType,
            baseType, subset) == 0)) {
        return (0);
    }
    /*
    * 2.2.3 D's {variety} is list or union and B is the ·simple ur-type
    * definition·.
    */
    if (WXS_IS_ANY_SIMPLE_TYPE(baseType) &&
        (WXS_IS_LIST(type) || WXS_IS_UNION(type))) {
        return (0);
    }
    /*
    * 2.2.4 B's {variety} is union and D is validly derived from a type
    * definition in B's {member type definitions} given the subset, as
    * defined by this constraint.
    *
    * NOTE: This seems not to involve built-in types, since there is no
    * built-in Union Simple Type.
    */
    if (WXS_IS_UNION(baseType)) {
        xmlSchemaTypeLinkPtr cur;

        cur = baseType->memberTypes;
        while (cur != NULL) {
            if (WXS_IS_TYPE_NOT_FIXED(cur->type))
                if (xmlSchemaTypeFixup(cur->type, actxt) == -1)
                    return(-1);
            if (xmlSchemaCheckCOSSTDerivedOK(actxt,
                    type, cur->type, subset) == 0)
            {
                /*
                * It just has to be validly derived from at least one
                * member-type.
                */
                return (0);
            }
            cur = cur->next;
        }
    }
    return (XML_SCHEMAP_COS_ST_DERIVED_OK_2_2);
}

/**
 * xmlSchemaCheckTypeDefCircularInternal:
 * @pctxt:  the schema parser context
 * @ctxtType:  the type definition
 * @ancestor: an ancestor of @ctxtType
 *
 * Checks st-props-correct (2) + ct-props-correct (3).
 * Circular type definitions are not allowed.
 *
 * Returns XML_SCHEMAP_ST_PROPS_CORRECT_2 if the given type is
 * circular, 0 otherwise.
 */
static int
xmlSchemaCheckTypeDefCircularInternal(xmlSchemaParserCtxtPtr pctxt,
                           xmlSchemaTypePtr ctxtType,
                           xmlSchemaTypePtr ancestor)
{
    int ret;

    if ((ancestor == NULL) || (ancestor->type == XML_SCHEMA_TYPE_BASIC))
        return (0);

    if (ctxtType == ancestor) {
        xmlSchemaPCustomErr(pctxt,
            XML_SCHEMAP_ST_PROPS_CORRECT_2,
            WXS_BASIC_CAST ctxtType, WXS_ITEM_NODE(ctxtType),
            "The definition is circular", NULL);
        return (XML_SCHEMAP_ST_PROPS_CORRECT_2);
    }
    if (ancestor->flags & XML_SCHEMAS_TYPE_MARKED) {
        /*
        * Avoid inifinite recursion on circular types not yet checked.
        */
        return (0);
    }
    ancestor->flags |= XML_SCHEMAS_TYPE_MARKED;
    ret = xmlSchemaCheckTypeDefCircularInternal(pctxt, ctxtType,
        ancestor->baseType);
    ancestor->flags ^= XML_SCHEMAS_TYPE_MARKED;
    return (ret);
}

/**
 * xmlSchemaCheckTypeDefCircular:
 * @item:  the complex/simple type definition
 * @ctxt:  the parser context
 * @name:  the name
 *
 * Checks for circular type definitions.
 */
static void
xmlSchemaCheckTypeDefCircular(xmlSchemaTypePtr item,
                              xmlSchemaParserCtxtPtr ctxt)
{
    if ((item == NULL) ||
        (item->type == XML_SCHEMA_TYPE_BASIC) ||
        (item->baseType == NULL))
        return;
    xmlSchemaCheckTypeDefCircularInternal(ctxt, item,
        item->baseType);
}

/*
* Simple Type Definition Representation OK (src-simple-type) 4
*
* "4 Circular union type definition is disallowed. That is, if the
* <union> alternative is chosen, there must not be any entries in the
* memberTypes [attribute] at any depth which resolve to the component
* corresponding to the <simpleType>."
*
* Note that this should work on the *representation* of a component,
* thus assumes any union types in the member types not being yet
* substituted. At this stage we need the variety of the types
* to be already computed.
*/
static int
xmlSchemaCheckUnionTypeDefCircularRecur(xmlSchemaParserCtxtPtr pctxt,
                                        xmlSchemaTypePtr ctxType,
                                        xmlSchemaTypeLinkPtr members)
{    
    xmlSchemaTypeLinkPtr member;
    xmlSchemaTypePtr memberType;
    
    member = members;
    while (member != NULL) {
        memberType = member->type;
        while ((memberType != NULL) &&
            (memberType->type != XML_SCHEMA_TYPE_BASIC)) {
            if (memberType == ctxType) {
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_SRC_SIMPLE_TYPE_4,
                    WXS_BASIC_CAST ctxType, NULL,
                    "The union type definition is circular", NULL);
                return (XML_SCHEMAP_SRC_SIMPLE_TYPE_4);
            }
            if ((WXS_IS_UNION(memberType)) &&
                ((memberType->flags & XML_SCHEMAS_TYPE_MARKED) == 0))
            {
                int res;
                memberType->flags |= XML_SCHEMAS_TYPE_MARKED;
                res = xmlSchemaCheckUnionTypeDefCircularRecur(pctxt,
                    ctxType,
                    xmlSchemaGetUnionSimpleTypeMemberTypes(memberType));
                memberType->flags ^= XML_SCHEMAS_TYPE_MARKED;
                if (res != 0)
                    return(res);
            }
            memberType = memberType->baseType;
        }
        member = member->next;
    }
    return(0);
}

static int
xmlSchemaCheckUnionTypeDefCircular(xmlSchemaParserCtxtPtr pctxt,
                                   xmlSchemaTypePtr type)
{
    if (! WXS_IS_UNION(type))
        return(0);
    return(xmlSchemaCheckUnionTypeDefCircularRecur(pctxt, type,
        type->memberTypes));
}

/**
 * xmlSchemaResolveTypeReferences:
 * @item:  the complex/simple type definition
 * @ctxt:  the parser context
 * @name:  the name
 *
 * Resolvese type definition references
 */
static void
xmlSchemaResolveTypeReferences(xmlSchemaTypePtr typeDef,
                         xmlSchemaParserCtxtPtr ctxt)
{
    if (typeDef == NULL)
        return;

    /*
    * Resolve the base type.
    */
    if (typeDef->baseType == NULL) {
        typeDef->baseType = xmlSchemaGetType(ctxt->schema,
            typeDef->base, typeDef->baseNs);
        if (typeDef->baseType == NULL) {
            xmlSchemaPResCompAttrErr(ctxt,
                XML_SCHEMAP_SRC_RESOLVE,
                WXS_BASIC_CAST typeDef, typeDef->node,
                "base", typeDef->base, typeDef->baseNs,
                XML_SCHEMA_TYPE_SIMPLE, NULL);
            return;
        }
    }
    if (WXS_IS_SIMPLE(typeDef)) {
        if (WXS_IS_UNION(typeDef)) {
            /*
            * Resolve the memberTypes.
            */
            xmlSchemaResolveUnionMemberTypes(ctxt, typeDef);
            return;
        } else if (WXS_IS_LIST(typeDef)) {
            /*
            * Resolve the itemType.
            */
            if ((typeDef->subtypes == NULL) && (typeDef->base != NULL)) {

                typeDef->subtypes = xmlSchemaGetType(ctxt->schema,
                    typeDef->base, typeDef->baseNs);

                if ((typeDef->subtypes == NULL) ||
                    (! WXS_IS_SIMPLE(typeDef->subtypes)))
                {
                    typeDef->subtypes = NULL;
                    xmlSchemaPResCompAttrErr(ctxt,
                        XML_SCHEMAP_SRC_RESOLVE,
                        WXS_BASIC_CAST typeDef, typeDef->node,
                        "itemType", typeDef->base, typeDef->baseNs,
                        XML_SCHEMA_TYPE_SIMPLE, NULL);
                }
            }
            return;
        }
    } 
    /*
    * The ball of letters below means, that if we have a particle
    * which has a QName-helper component as its {term}, we want
    * to resolve it...
    */
    else if ((WXS_TYPE_CONTENTTYPE(typeDef) != NULL) &&
        ((WXS_TYPE_CONTENTTYPE(typeDef))->type ==
            XML_SCHEMA_TYPE_PARTICLE) &&
        (WXS_TYPE_PARTICLE_TERM(typeDef) != NULL) &&
        ((WXS_TYPE_PARTICLE_TERM(typeDef))->type ==
            XML_SCHEMA_EXTRA_QNAMEREF))
    {
        xmlSchemaQNameRefPtr ref =
            WXS_QNAME_CAST WXS_TYPE_PARTICLE_TERM(typeDef);
        xmlSchemaModelGroupDefPtr groupDef;

        /*
        * URGENT TODO: Test this.
        */
        WXS_TYPE_PARTICLE_TERM(typeDef) = NULL;
        /*
        * Resolve the MG definition reference.
        */
        groupDef =
            WXS_MODEL_GROUPDEF_CAST xmlSchemaGetNamedComponent(ctxt->schema,
                ref->itemType, ref->name, ref->targetNamespace);
        if (groupDef == NULL) {
            xmlSchemaPResCompAttrErr(ctxt, XML_SCHEMAP_SRC_RESOLVE,
                NULL, WXS_ITEM_NODE(WXS_TYPE_PARTICLE(typeDef)),
                "ref", ref->name, ref->targetNamespace, ref->itemType,
                NULL);
            /* Remove the particle. */
            WXS_TYPE_CONTENTTYPE(typeDef) = NULL;
        } else if (WXS_MODELGROUPDEF_MODEL(groupDef) == NULL)
            /* Remove the particle. */
            WXS_TYPE_CONTENTTYPE(typeDef) = NULL;
        else {
            /*
            * Assign the MG definition's {model group} to the
            * particle's {term}.
            */
            WXS_TYPE_PARTICLE_TERM(typeDef) = WXS_MODELGROUPDEF_MODEL(groupDef);
            
            if (WXS_MODELGROUPDEF_MODEL(groupDef)->type == XML_SCHEMA_TYPE_ALL) {
                /*
                * SPEC cos-all-limited (1.2)
                * "1.2 the {term} property of a particle with
                * {max occurs}=1 which is part of a pair which constitutes
                * the {content type} of a complex type definition."
                */
                if ((WXS_TYPE_PARTICLE(typeDef))->maxOccurs != 1) {
                    xmlSchemaCustomErr(ACTXT_CAST ctxt,
                        /* TODO: error code */
                        XML_SCHEMAP_COS_ALL_LIMITED,
                        WXS_ITEM_NODE(WXS_TYPE_PARTICLE(typeDef)), NULL,
                        "The particle's {max occurs} must be 1, since the "
                        "reference resolves to an 'all' model group",
                        NULL, NULL);
                }
            }
        }
    }
}



/**
 * xmlSchemaCheckSTPropsCorrect:
 * @ctxt:  the schema parser context
 * @type:  the simple type definition
 *
 * Checks st-props-correct.
 *
 * Returns 0 if the properties are correct,
 * if not, a positive error code and -1 on internal
 * errors.
 */
static int
xmlSchemaCheckSTPropsCorrect(xmlSchemaParserCtxtPtr ctxt,
                             xmlSchemaTypePtr type)
{
    xmlSchemaTypePtr baseType = type->baseType;
    xmlChar *str = NULL;

    /* STATE: error funcs converted. */
    /*
    * Schema Component Constraint: Simple Type Definition Properties Correct
    *
    * NOTE: This is somehow redundant, since we actually built a simple type
    * to have all the needed information; this acts as an self test.
    */
    /* Base type: If the datatype has been ·derived· by ·restriction·
    * then the Simple Type Definition component from which it is ·derived·,
    * otherwise the Simple Type Definition for anySimpleType (§4.1.6).
    */
    if (baseType == NULL) {
        /*
        * TODO: Think about: "modulo the impact of Missing
        * Sub-components (§5.3)."
        */
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_ST_PROPS_CORRECT_1,
            WXS_BASIC_CAST type, NULL,
            "No base type existent", NULL);
        return (XML_SCHEMAP_ST_PROPS_CORRECT_1);

    }
    if (! WXS_IS_SIMPLE(baseType)) {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_ST_PROPS_CORRECT_1,
            WXS_BASIC_CAST type, NULL,
            "The base type '%s' is not a simple type",
            xmlSchemaGetComponentQName(&str, baseType));
        FREE_AND_NULL(str)
        return (XML_SCHEMAP_ST_PROPS_CORRECT_1);
    }
    if ( (WXS_IS_LIST(type) || WXS_IS_UNION(type)) &&
         (WXS_IS_RESTRICTION(type) == 0) &&
         (! WXS_IS_ANY_SIMPLE_TYPE(baseType))) {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_ST_PROPS_CORRECT_1,
            WXS_BASIC_CAST type, NULL,
            "A type, derived by list or union, must have"
            "the simple ur-type definition as base type, not '%s'",
            xmlSchemaGetComponentQName(&str, baseType));
        FREE_AND_NULL(str)
        return (XML_SCHEMAP_ST_PROPS_CORRECT_1);
    }
    /*
    * Variety: One of {atomic, list, union}.
    */
    if ((! WXS_IS_ATOMIC(type)) && (! WXS_IS_UNION(type)) &&
        (! WXS_IS_LIST(type))) {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_ST_PROPS_CORRECT_1,
            WXS_BASIC_CAST type, NULL,
            "The variety is absent", NULL);
        return (XML_SCHEMAP_ST_PROPS_CORRECT_1);
    }
    /* TODO: Finish this. Hmm, is this finished? */

    /*
    * 3 The {final} of the {base type definition} must not contain restriction.
    */
    if (xmlSchemaTypeFinalContains(baseType,
        XML_SCHEMAS_TYPE_FINAL_RESTRICTION)) {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_ST_PROPS_CORRECT_3,
            WXS_BASIC_CAST type, NULL,
            "The 'final' of its base type '%s' must not contain "
            "'restriction'",
            xmlSchemaGetComponentQName(&str, baseType));
        FREE_AND_NULL(str)
        return (XML_SCHEMAP_ST_PROPS_CORRECT_3);
    }

    /*
    * 2 All simple type definitions must be derived ultimately from the ·simple
    * ur-type definition (so· circular definitions are disallowed). That is, it
    * must be possible to reach a built-in primitive datatype or the ·simple
    * ur-type definition· by repeatedly following the {base type definition}.
    *
    * NOTE: this is done in xmlSchemaCheckTypeDefCircular().
    */
    return (0);
}

/**
 * xmlSchemaCheckCOSSTRestricts:
 * @ctxt:  the schema parser context
 * @type:  the simple type definition
 *
 * Schema Component Constraint:
 * Derivation Valid (Restriction, Simple) (cos-st-restricts)

 * Checks if the given @type (simpleType) is derived validly by restriction.
 * STATUS:
 *
 * Returns -1 on internal errors, 0 if the type is validly derived,
 * a positive error code otherwise.
 */
static int
xmlSchemaCheckCOSSTRestricts(xmlSchemaParserCtxtPtr pctxt,
                             xmlSchemaTypePtr type)
{
    xmlChar *str = NULL;

    if (type->type != XML_SCHEMA_TYPE_SIMPLE) {
        PERROR_INT("xmlSchemaCheckCOSSTRestricts",
            "given type is not a user-derived simpleType");
        return (-1);
    }

    if (WXS_IS_ATOMIC(type)) {
        xmlSchemaTypePtr primitive;
        /*
        * 1.1 The {base type definition} must be an atomic simple
        * type definition or a built-in primitive datatype.
        */
        if (! WXS_IS_ATOMIC(type->baseType)) {
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_COS_ST_RESTRICTS_1_1,
                WXS_BASIC_CAST type, NULL,
                "The base type '%s' is not an atomic simple type",
                xmlSchemaGetComponentQName(&str, type->baseType));
            FREE_AND_NULL(str)
            return (XML_SCHEMAP_COS_ST_RESTRICTS_1_1);
        }
        /* 1.2 The {final} of the {base type definition} must not contain
        * restriction.
        */
        /* OPTIMIZE TODO : This is already done in xmlSchemaCheckStPropsCorrect */
        if (xmlSchemaTypeFinalContains(type->baseType,
            XML_SCHEMAS_TYPE_FINAL_RESTRICTION)) {
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_COS_ST_RESTRICTS_1_2,
                WXS_BASIC_CAST type, NULL,
                "The final of its base type '%s' must not contain 'restriction'",
                xmlSchemaGetComponentQName(&str, type->baseType));
            FREE_AND_NULL(str)
            return (XML_SCHEMAP_COS_ST_RESTRICTS_1_2);
        }

        /*
        * 1.3.1 DF must be an allowed constraining facet for the {primitive
        * type definition}, as specified in the appropriate subsection of 3.2
        * Primitive datatypes.
        */
        if (type->facets != NULL) {
            xmlSchemaFacetPtr facet;
            int ok = 1;

            primitive = xmlSchemaGetPrimitiveType(type);
            if (primitive == NULL) {
                PERROR_INT("xmlSchemaCheckCOSSTRestricts",
                    "failed to get primitive type");
                return (-1);
            }
            facet = type->facets;
            do {
                if (xmlSchemaIsBuiltInTypeFacet(primitive, facet->type) == 0) {
                    ok = 0;
                    xmlSchemaPIllegalFacetAtomicErr(pctxt,
                        XML_SCHEMAP_COS_ST_RESTRICTS_1_3_1,
                        type, primitive, facet);
                }
                facet = facet->next;
            } while (facet != NULL);
            if (ok == 0)
                return (XML_SCHEMAP_COS_ST_RESTRICTS_1_3_1);
        }
        /*
        * SPEC (1.3.2) "If there is a facet of the same kind in the {facets}
        * of the {base type definition} (call this BF),then the DF's {value}
        * must be a valid restriction of BF's {value} as defined in
        * [XML Schemas: Datatypes]."
        *
        * NOTE (1.3.2) Facet derivation constraints are currently handled in
        * xmlSchemaDeriveAndValidateFacets()
        */
    } else if (WXS_IS_LIST(type)) {
        xmlSchemaTypePtr itemType = NULL;

        itemType = type->subtypes;
        if ((itemType == NULL) || (! WXS_IS_SIMPLE(itemType))) {
            PERROR_INT("xmlSchemaCheckCOSSTRestricts",
                "failed to evaluate the item type");
            return (-1);
        }
        if (WXS_IS_TYPE_NOT_FIXED(itemType))
            xmlSchemaTypeFixup(itemType, ACTXT_CAST pctxt);
        /*
        * 2.1 The {item type definition} must have a {variety} of atomic or
        * union (in which case all the {member type definitions}
        * must be atomic).
        */
        if ((! WXS_IS_ATOMIC(itemType)) &&
            (! WXS_IS_UNION(itemType))) {
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_COS_ST_RESTRICTS_2_1,
                WXS_BASIC_CAST type, NULL,
                "The item type '%s' does not have a variety of atomic or union",
                xmlSchemaGetComponentQName(&str, itemType));
            FREE_AND_NULL(str)
            return (XML_SCHEMAP_COS_ST_RESTRICTS_2_1);
        } else if (WXS_IS_UNION(itemType)) {
            xmlSchemaTypeLinkPtr member;

            member = itemType->memberTypes;
            while (member != NULL) {
                if (! WXS_IS_ATOMIC(member->type)) {
                    xmlSchemaPCustomErr(pctxt,
                        XML_SCHEMAP_COS_ST_RESTRICTS_2_1,
                        WXS_BASIC_CAST type, NULL,
                        "The item type is a union type, but the "
                        "member type '%s' of this item type is not atomic",
                        xmlSchemaGetComponentQName(&str, member->type));
                    FREE_AND_NULL(str)
                    return (XML_SCHEMAP_COS_ST_RESTRICTS_2_1);
                }
                member = member->next;
            }
        }

        if (WXS_IS_ANY_SIMPLE_TYPE(type->baseType)) {
            xmlSchemaFacetPtr facet;
            /*
            * This is the case if we have: <simpleType><list ..
            */
            /*
            * 2.3.1
            * 2.3.1.1 The {final} of the {item type definition} must not
            * contain list.
            */
            if (xmlSchemaTypeFinalContains(itemType,
                XML_SCHEMAS_TYPE_FINAL_LIST)) {
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_COS_ST_RESTRICTS_2_3_1_1,
                    WXS_BASIC_CAST type, NULL,
                    "The final of its item type '%s' must not contain 'list'",
                    xmlSchemaGetComponentQName(&str, itemType));
                FREE_AND_NULL(str)
                return (XML_SCHEMAP_COS_ST_RESTRICTS_2_3_1_1);
            }
            /*
            * 2.3.1.2 The {facets} must only contain the whiteSpace
            * facet component.
            * OPTIMIZE TODO: the S4S already disallows any facet
            * to be specified.
            */
            if (type->facets != NULL) {
                facet = type->facets;
                do {
                    if (facet->type != XML_SCHEMA_FACET_WHITESPACE) {
                        xmlSchemaPIllegalFacetListUnionErr(pctxt,
                            XML_SCHEMAP_COS_ST_RESTRICTS_2_3_1_2,
                            type, facet);
                        return (XML_SCHEMAP_COS_ST_RESTRICTS_2_3_1_2);
                    }
                    facet = facet->next;
                } while (facet != NULL);
            }
            /*
            * MAYBE TODO: (Hmm, not really) Datatypes states:
            * A ·list· datatype can be ·derived· from an ·atomic· datatype
            * whose ·lexical space· allows space (such as string or anyURI)or
            * a ·union· datatype any of whose {member type definitions}'s
            * ·lexical space· allows space.
            */
        } else {
            /*
            * This is the case if we have: <simpleType><restriction ...
            * I.e. the variety of "list" is inherited.
            */
            /*
            * 2.3.2
            * 2.3.2.1 The {base type definition} must have a {variety} of list.
            */
            if (! WXS_IS_LIST(type->baseType)) {
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_COS_ST_RESTRICTS_2_3_2_1,
                    WXS_BASIC_CAST type, NULL,
                    "The base type '%s' must be a list type",
                    xmlSchemaGetComponentQName(&str, type->baseType));
                FREE_AND_NULL(str)
                return (XML_SCHEMAP_COS_ST_RESTRICTS_2_3_2_1);
            }
            /*
            * 2.3.2.2 The {final} of the {base type definition} must not
            * contain restriction.
            */
            if (xmlSchemaTypeFinalContains(type->baseType,
                XML_SCHEMAS_TYPE_FINAL_RESTRICTION)) {
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_COS_ST_RESTRICTS_2_3_2_2,
                    WXS_BASIC_CAST type, NULL,
                    "The 'final' of the base type '%s' must not contain 'restriction'",
                    xmlSchemaGetComponentQName(&str, type->baseType));
                FREE_AND_NULL(str)
                return (XML_SCHEMAP_COS_ST_RESTRICTS_2_3_2_2);
            }
            /*
            * 2.3.2.3 The {item type definition} must be validly derived
            * from the {base type definition}'s {item type definition} given
            * the empty set, as defined in Type Derivation OK (Simple) (§3.14.6).
            */
            {
                xmlSchemaTypePtr baseItemType;

                baseItemType = type->baseType->subtypes;
                if ((baseItemType == NULL) || (! WXS_IS_SIMPLE(baseItemType))) {
                    PERROR_INT("xmlSchemaCheckCOSSTRestricts",
                        "failed to eval the item type of a base type");
                    return (-1);
                }
                if ((itemType != baseItemType) &&
                    (xmlSchemaCheckCOSSTDerivedOK(ACTXT_CAST pctxt, itemType,
                        baseItemType, 0) != 0)) {
                    xmlChar *strBIT = NULL, *strBT = NULL;
                    xmlSchemaPCustomErrExt(pctxt,
                        XML_SCHEMAP_COS_ST_RESTRICTS_2_3_2_3,
                        WXS_BASIC_CAST type, NULL,
                        "The item type '%s' is not validly derived from "
                        "the item type '%s' of the base type '%s'",
                        xmlSchemaGetComponentQName(&str, itemType),
                        xmlSchemaGetComponentQName(&strBIT, baseItemType),
                        xmlSchemaGetComponentQName(&strBT, type->baseType));

                    FREE_AND_NULL(str)
                    FREE_AND_NULL(strBIT)
                    FREE_AND_NULL(strBT)
                    return (XML_SCHEMAP_COS_ST_RESTRICTS_2_3_2_3);
                }
            }

            if (type->facets != NULL) {
                xmlSchemaFacetPtr facet;
                int ok = 1;
                /*
                * 2.3.2.4 Only length, minLength, maxLength, whiteSpace, pattern
                * and enumeration facet components are allowed among the {facets}.
                */
                facet = type->facets;
                do {
                    switch (facet->type) {
                        case XML_SCHEMA_FACET_LENGTH:
                        case XML_SCHEMA_FACET_MINLENGTH:
                        case XML_SCHEMA_FACET_MAXLENGTH:
                        case XML_SCHEMA_FACET_WHITESPACE:
                            /*
                            * TODO: 2.5.1.2 List datatypes
                            * The value of ·whiteSpace· is fixed to the value collapse.
                            */
                        case XML_SCHEMA_FACET_PATTERN:
                        case XML_SCHEMA_FACET_ENUMERATION:
                            break;
                        default: {
                            xmlSchemaPIllegalFacetListUnionErr(pctxt,
                                XML_SCHEMAP_COS_ST_RESTRICTS_2_3_2_4,
                                type, facet);
                            /*
                            * We could return, but it's nicer to report all
                            * invalid facets.
                            */
                            ok = 0;
                        }
                    }
                    facet = facet->next;
                } while (facet != NULL);
                if (ok == 0)
                    return (XML_SCHEMAP_COS_ST_RESTRICTS_2_3_2_4);
                /*
                * SPEC (2.3.2.5) (same as 1.3.2)
                *
                * NOTE (2.3.2.5) This is currently done in
                * xmlSchemaDeriveAndValidateFacets()
                */
            }
        }
    } else if (WXS_IS_UNION(type)) {
        /*
        * 3.1 The {member type definitions} must all have {variety} of
        * atomic or list.
        */
        xmlSchemaTypeLinkPtr member;

        member = type->memberTypes;
        while (member != NULL) {
            if (WXS_IS_TYPE_NOT_FIXED(member->type))
                xmlSchemaTypeFixup(member->type, ACTXT_CAST pctxt);

            if ((! WXS_IS_ATOMIC(member->type)) &&
                (! WXS_IS_LIST(member->type))) {
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_COS_ST_RESTRICTS_3_1,
                    WXS_BASIC_CAST type, NULL,
                    "The member type '%s' is neither an atomic, nor a list type",
                    xmlSchemaGetComponentQName(&str, member->type));
                FREE_AND_NULL(str)
                return (XML_SCHEMAP_COS_ST_RESTRICTS_3_1);
            }
            member = member->next;
        }
        /*
        * 3.3.1 If the {base type definition} is the ·simple ur-type
        * definition·
        */
        if (type->baseType->builtInType == XML_SCHEMAS_ANYSIMPLETYPE) {
            /*
            * 3.3.1.1 All of the {member type definitions} must have a
            * {final} which does not contain union.
            */
            member = type->memberTypes;
            while (member != NULL) {
                if (xmlSchemaTypeFinalContains(member->type,
                    XML_SCHEMAS_TYPE_FINAL_UNION)) {
                    xmlSchemaPCustomErr(pctxt,
                        XML_SCHEMAP_COS_ST_RESTRICTS_3_3_1,
                        WXS_BASIC_CAST type, NULL,
                        "The 'final' of member type '%s' contains 'union'",
                        xmlSchemaGetComponentQName(&str, member->type));
                    FREE_AND_NULL(str)
                    return (XML_SCHEMAP_COS_ST_RESTRICTS_3_3_1);
                }
                member = member->next;
            }
            /*
            * 3.3.1.2 The {facets} must be empty.
            */
            if (type->facetSet != NULL) {
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_COS_ST_RESTRICTS_3_3_1_2,
                    WXS_BASIC_CAST type, NULL,
                    "No facets allowed", NULL);
                return (XML_SCHEMAP_COS_ST_RESTRICTS_3_3_1_2);
            }
        } else {
            /*
            * 3.3.2.1 The {base type definition} must have a {variety} of union.
            * I.e. the variety of "list" is inherited.
            */
            if (! WXS_IS_UNION(type->baseType)) {
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_COS_ST_RESTRICTS_3_3_2_1,
                    WXS_BASIC_CAST type, NULL,
                    "The base type '%s' is not a union type",
                    xmlSchemaGetComponentQName(&str, type->baseType));
                FREE_AND_NULL(str)
                return (XML_SCHEMAP_COS_ST_RESTRICTS_3_3_2_1);
            }
            /*
            * 3.3.2.2 The {final} of the {base type definition} must not contain restriction.
            */
            if (xmlSchemaTypeFinalContains(type->baseType,
                XML_SCHEMAS_TYPE_FINAL_RESTRICTION)) {
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_COS_ST_RESTRICTS_3_3_2_2,
                    WXS_BASIC_CAST type, NULL,
                    "The 'final' of its base type '%s' must not contain 'restriction'",
                    xmlSchemaGetComponentQName(&str, type->baseType));
                FREE_AND_NULL(str)
                return (XML_SCHEMAP_COS_ST_RESTRICTS_3_3_2_2);
            }
            /*
            * 3.3.2.3 The {member type definitions}, in order, must be validly
            * derived from the corresponding type definitions in the {base
            * type definition}'s {member type definitions} given the empty set,
            * as defined in Type Derivation OK (Simple) (§3.14.6).
            */
            {
                xmlSchemaTypeLinkPtr baseMember;

                /*
                * OPTIMIZE: if the type is restricting, it has no local defined
                * member types and inherits the member types of the base type;
                * thus a check for equality can be skipped.
                */
                /*
                * Even worse: I cannot see a scenario where a restricting
                * union simple type can have other member types as the member
                * types of it's base type. This check seems not necessary with
                * respect to the derivation process in libxml2.
                * But necessary if constructing types with an API.
                */
                if (type->memberTypes != NULL) {
                    member = type->memberTypes;
                    baseMember = xmlSchemaGetUnionSimpleTypeMemberTypes(type->baseType);
                    if ((member == NULL) && (baseMember != NULL)) {
                        PERROR_INT("xmlSchemaCheckCOSSTRestricts",
                            "different number of member types in base");
                    }
                    while (member != NULL) {
                        if (baseMember == NULL) {
                            PERROR_INT("xmlSchemaCheckCOSSTRestricts",
                            "different number of member types in base");
                        } else if ((member->type != baseMember->type) &&
                            (xmlSchemaCheckCOSSTDerivedOK(ACTXT_CAST pctxt,
                                member->type, baseMember->type, 0) != 0)) {
                            xmlChar *strBMT = NULL, *strBT = NULL;

                            xmlSchemaPCustomErrExt(pctxt,
                                XML_SCHEMAP_COS_ST_RESTRICTS_3_3_2_3,
                                WXS_BASIC_CAST type, NULL,
                                "The member type %s is not validly "
                                "derived from its corresponding member "
                                "type %s of the base type %s",
                                xmlSchemaGetComponentQName(&str, member->type),
                                xmlSchemaGetComponentQName(&strBMT, baseMember->type),
                                xmlSchemaGetComponentQName(&strBT, type->baseType));
                            FREE_AND_NULL(str)
                            FREE_AND_NULL(strBMT)
                            FREE_AND_NULL(strBT)
                            return (XML_SCHEMAP_COS_ST_RESTRICTS_3_3_2_3);
                        }
                        member = member->next;
                        baseMember = baseMember->next;
                    }
                }
            }
            /*
            * 3.3.2.4 Only pattern and enumeration facet components are
            * allowed among the {facets}.
            */
            if (type->facets != NULL) {
                xmlSchemaFacetPtr facet;
                int ok = 1;

                facet = type->facets;
                do {
                    if ((facet->type != XML_SCHEMA_FACET_PATTERN) &&
                        (facet->type != XML_SCHEMA_FACET_ENUMERATION)) {
                        xmlSchemaPIllegalFacetListUnionErr(pctxt,
                                XML_SCHEMAP_COS_ST_RESTRICTS_3_3_2_4,
                                type, facet);
                        ok = 0;
                    }
                    facet = facet->next;
                } while (facet != NULL);
                if (ok == 0)
                    return (XML_SCHEMAP_COS_ST_RESTRICTS_3_3_2_4);

            }
            /*
            * SPEC (3.3.2.5) (same as 1.3.2)
            *
            * NOTE (3.3.2.5) This is currently done in
            * xmlSchemaDeriveAndValidateFacets()
            */
        }
    }

    return (0);
}

/**
 * xmlSchemaCheckSRCSimpleType:
 * @ctxt:  the schema parser context
 * @type:  the simple type definition
 *
 * Checks crc-simple-type constraints. 
 *
 * Returns 0 if the constraints are satisfied,
 * if not a positive error code and -1 on internal
 * errors.
 */
#if 0
static int
xmlSchemaCheckSRCSimpleType(xmlSchemaParserCtxtPtr ctxt,
                            xmlSchemaTypePtr type)
{
    /*
    * src-simple-type.1 The corresponding simple type definition, if any,
    * must satisfy the conditions set out in Constraints on Simple Type
    * Definition Schema Components (§3.14.6).
    */    
    if (WXS_IS_RESTRICTION(type)) {
        /*
        * src-simple-type.2 "If the <restriction> alternative is chosen,
        * either it must have a base [attribute] or a <simpleType> among its
        * [children], but not both."
        * NOTE: This is checked in the parse function of <restriction>.
        */
        /*
        * 
        */
    } else if (WXS_IS_LIST(type)) {
        /* src-simple-type.3 "If the <list> alternative is chosen, either it must have
        * an itemType [attribute] or a <simpleType> among its [children],
        * but not both."
        *
        * NOTE: This is checked in the parse function of <list>.
        */
    } else if (WXS_IS_UNION(type)) {    
        /* 
        * src-simple-type.4 is checked in xmlSchemaCheckUnionTypeDefCircular().
        */
    }
    return (0);
}
#endif

static int
xmlSchemaCreateVCtxtOnPCtxt(xmlSchemaParserCtxtPtr ctxt)
{
   if (ctxt->vctxt == NULL) {
        ctxt->vctxt = xmlSchemaNewValidCtxt(NULL);
        if (ctxt->vctxt == NULL) {
            xmlSchemaPErr(ctxt, NULL,
                XML_SCHEMAP_INTERNAL,
                "Internal error: xmlSchemaCreateVCtxtOnPCtxt, "
                "failed to create a temp. validation context.\n",
                NULL, NULL);
            return (-1);
        }
        /* TODO: Pass user data. */
        xmlSchemaSetValidErrors(ctxt->vctxt,
            ctxt->error, ctxt->warning, ctxt->errCtxt);
        xmlSchemaSetValidStructuredErrors(ctxt->vctxt,
            ctxt->serror, ctxt->errCtxt);
    }
    return (0);
}

static int
xmlSchemaVCheckCVCSimpleType(xmlSchemaAbstractCtxtPtr actxt,
                             xmlNodePtr node,
                             xmlSchemaTypePtr type,
                             const xmlChar *value,
                             xmlSchemaValPtr *retVal,
                             int fireErrors,
                             int normalize,
                             int isNormalized);

/**
 * xmlSchemaParseCheckCOSValidDefault:
 * @pctxt:  the schema parser context
 * @type:  the simple type definition
 * @value: the default value
 * @node: an optional node (the holder of the value)
 *
 * Schema Component Constraint: Element Default Valid (Immediate)
 * (cos-valid-default)
 * This will be used by the parser only. For the validator there's
 * an other version.
 *
 * Returns 0 if the constraints are satisfied,
 * if not, a positive error code and -1 on internal
 * errors.
 */
static int
xmlSchemaParseCheckCOSValidDefault(xmlSchemaParserCtxtPtr pctxt,
                                   xmlNodePtr node,
                                   xmlSchemaTypePtr type,
                                   const xmlChar *value,
                                   xmlSchemaValPtr *val)
{
    int ret = 0;

    /*
    * cos-valid-default:
    * Schema Component Constraint: Element Default Valid (Immediate)
    * For a string to be a valid default with respect to a type
    * definition the appropriate case among the following must be true:
    */
    if WXS_IS_COMPLEX(type) {
        /*
        * Complex type.
        *
        * SPEC (2.1) "its {content type} must be a simple type definition
        * or mixed."
        * SPEC (2.2.2) "If the {content type} is mixed, then the {content
        * type}'s particle must be ·emptiable· as defined by
        * Particle Emptiable (§3.9.6)."
        */
        if ((! WXS_HAS_SIMPLE_CONTENT(type)) &&
            ((! WXS_HAS_MIXED_CONTENT(type)) || (! WXS_EMPTIABLE(type)))) {
            /* NOTE that this covers (2.2.2) as well. */
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_COS_VALID_DEFAULT_2_1,
                WXS_BASIC_CAST type, type->node,
                "For a string to be a valid default, the type definition "
                "must be a simple type or a complex type with mixed content "
                "and a particle emptiable", NULL);
            return(XML_SCHEMAP_COS_VALID_DEFAULT_2_1);
        }
    }
    /*
    * 1 If the type definition is a simple type definition, then the string
    * must be ·valid· with respect to that definition as defined by String
    * Valid (§3.14.4).
    *
    * AND
    *
    * 2.2.1 If the {content type} is a simple type definition, then the
    * string must be ·valid· with respect to that simple type definition
    * as defined by String Valid (§3.14.4).
    */
    if (WXS_IS_SIMPLE(type))
        ret = xmlSchemaVCheckCVCSimpleType(ACTXT_CAST pctxt, node,
            type, value, val, 1, 1, 0);
    else if (WXS_HAS_SIMPLE_CONTENT(type))
        ret = xmlSchemaVCheckCVCSimpleType(ACTXT_CAST pctxt, node,
            type->contentTypeDef, value, val, 1, 1, 0);
    else
        return (ret);

    if (ret < 0) {
        PERROR_INT("xmlSchemaParseCheckCOSValidDefault",
            "calling xmlSchemaVCheckCVCSimpleType()");
    }

    return (ret);
}

/**
 * xmlSchemaCheckCTPropsCorrect:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 *
 *.(4.6) Constraints on Complex Type Definition Schema Components
 * Schema Component Constraint:
 * Complex Type Definition Properties Correct (ct-props-correct)
 * STATUS: (seems) complete
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckCTPropsCorrect(xmlSchemaParserCtxtPtr pctxt,
                             xmlSchemaTypePtr type)
{
    /*
    * TODO: Correct the error code; XML_SCHEMAP_SRC_CT_1 is used temporarily.
    *
    * SPEC (1) "The values of the properties of a complex type definition must
    * be as described in the property tableau in The Complex Type Definition
    * Schema Component (§3.4.1), modulo the impact of Missing
    * Sub-components (§5.3)."
    */
    if ((type->baseType != NULL) &&
        (WXS_IS_SIMPLE(type->baseType)) &&
        (WXS_IS_EXTENSION(type) == 0)) {
        /*
        * SPEC (2) "If the {base type definition} is a simple type definition,
        * the {derivation method} must be extension."
        */
        xmlSchemaCustomErr(ACTXT_CAST pctxt,
            XML_SCHEMAP_SRC_CT_1,
            NULL, WXS_BASIC_CAST type, 
            "If the base type is a simple type, the derivation method must be "
            "'extension'", NULL, NULL);
        return (XML_SCHEMAP_SRC_CT_1);
    }
    /*
    * SPEC (3) "Circular definitions are disallowed, except for the ·ur-type
    * definition·. That is, it must be possible to reach the ·ur-type
    * definition by repeatedly following the {base type definition}."
    *
    * NOTE (3) is done in xmlSchemaCheckTypeDefCircular().
    */
    /*
    * NOTE that (4) and (5) need the following:
    *   - attribute uses need to be already inherited (apply attr. prohibitions)
    *   - attribute group references need to be expanded already
    *   - simple types need to be typefixed already
    */    
    if (type->attrUses &&
        (((xmlSchemaItemListPtr) type->attrUses)->nbItems > 1))
    {
        xmlSchemaItemListPtr uses = (xmlSchemaItemListPtr) type->attrUses;
        xmlSchemaAttributeUsePtr use, tmp;
        int i, j, hasId = 0;

        for (i = uses->nbItems -1; i >= 0; i--) {
            use = uses->items[i];
            
            /* 
            * SPEC ct-props-correct
            * (4) "Two distinct attribute declarations in the
            * {attribute uses} must not have identical {name}s and
            * {target namespace}s."
            */
            if (i > 0) {
                for (j = i -1; j >= 0; j--) {
                    tmp = uses->items[j];
                    if ((WXS_ATTRUSE_DECL_NAME(use) ==
                        WXS_ATTRUSE_DECL_NAME(tmp)) &&
                        (WXS_ATTRUSE_DECL_TNS(use) ==
                        WXS_ATTRUSE_DECL_TNS(tmp)))
                    {
                        xmlChar *str = NULL;

                        xmlSchemaCustomErr(ACTXT_CAST pctxt,
                            XML_SCHEMAP_AG_PROPS_CORRECT,
                            NULL, WXS_BASIC_CAST type,
                            "Duplicate %s",
                            xmlSchemaGetComponentDesignation(&str, use),
                            NULL);
                        FREE_AND_NULL(str);
                        /*
                        * Remove the duplicate.
                        */
                        if (xmlSchemaItemListRemove(uses, i) == -1)
                            goto exit_failure;
                        goto next_use;
                    }
                }
            }
            /*
            * SPEC ct-props-correct
            * (5) "Two distinct attribute declarations in the
            * {attribute uses} must not have {type definition}s which
            * are or are derived from ID."
            */
            if (WXS_ATTRUSE_TYPEDEF(use) != NULL) {
                if (xmlSchemaIsDerivedFromBuiltInType(
                    WXS_ATTRUSE_TYPEDEF(use), XML_SCHEMAS_ID))
                {               
                    if (hasId) {
                        xmlChar *str = NULL;
                        
                        xmlSchemaCustomErr(ACTXT_CAST pctxt,
                            XML_SCHEMAP_AG_PROPS_CORRECT,
                            NULL, WXS_BASIC_CAST type,
                            "There must not exist more than one attribute "
                            "declaration of type 'xs:ID' "
                            "(or derived from 'xs:ID'). The %s violates this "
                            "constraint",
                            xmlSchemaGetComponentDesignation(&str, use),
                            NULL);
                        FREE_AND_NULL(str);
                        if (xmlSchemaItemListRemove(uses, i) == -1)
                            goto exit_failure;
                    }
                    
                    hasId = 1;
                }
            }
next_use: {}
        }
    }
    return (0);
exit_failure:
    return(-1);
}

static int
xmlSchemaAreEqualTypes(xmlSchemaTypePtr typeA,
                       xmlSchemaTypePtr typeB)
{
    /*
    * TODO: This should implement component-identity
    * in the future.
    */
    if ((typeA == NULL) || (typeB == NULL))
        return (0);
    return (typeA == typeB);
}

/**
 * xmlSchemaCheckCOSCTDerivedOK:
 * @ctxt:  the schema parser context
 * @type:  the to-be derived complex type definition
 * @baseType:  the base complex type definition
 * @set: the given set
 *
 * Schema Component Constraint:
 * Type Derivation OK (Complex) (cos-ct-derived-ok)
 *
 * STATUS: completed
 *
 * Returns 0 if the constraints are satisfied, or 1
 * if not.
 */
static int
xmlSchemaCheckCOSCTDerivedOK(xmlSchemaAbstractCtxtPtr actxt,
                             xmlSchemaTypePtr type,
                             xmlSchemaTypePtr baseType,
                             int set)
{
    int equal = xmlSchemaAreEqualTypes(type, baseType);
    /* TODO: Error codes. */
    /*
    * SPEC "For a complex type definition (call it D, for derived)
    * to be validly derived from a type definition (call this
    * B, for base) given a subset of {extension, restriction}
    * all of the following must be true:"
    */
    if (! equal) {
        /*
        * SPEC (1) "If B and D are not the same type definition, then the
        * {derivation method} of D must not be in the subset."
        */
        if (((set & SUBSET_EXTENSION) && (WXS_IS_EXTENSION(type))) ||
            ((set & SUBSET_RESTRICTION) && (WXS_IS_RESTRICTION(type))))
            return (1);
    } else {
        /*
        * SPEC (2.1) "B and D must be the same type definition."
        */
        return (0);
    }
    /*
    * SPEC (2.2) "B must be D's {base type definition}."
    */
    if (type->baseType == baseType)
        return (0);
    /*
    * SPEC (2.3.1) "D's {base type definition} must not be the ·ur-type
    * definition·."
    */
    if (WXS_IS_ANYTYPE(type->baseType))
        return (1);

    if (WXS_IS_COMPLEX(type->baseType)) {
        /*
        * SPEC (2.3.2.1) "If D's {base type definition} is complex, then it
        * must be validly derived from B given the subset as defined by this
        * constraint."
        */
        return (xmlSchemaCheckCOSCTDerivedOK(actxt, type->baseType,
            baseType, set));
    } else {
        /*
        * SPEC (2.3.2.2) "If D's {base type definition} is simple, then it
        * must be validly derived from B given the subset as defined in Type
        * Derivation OK (Simple) (§3.14.6).
        */
        return (xmlSchemaCheckCOSSTDerivedOK(actxt, type->baseType,
            baseType, set));
    }
}

/**
 * xmlSchemaCheckCOSDerivedOK:
 * @type:  the derived simple type definition
 * @baseType:  the base type definition
 *
 * Calls:
 * Type Derivation OK (Simple) AND Type Derivation OK (Complex)
 *
 * Checks whether @type can be validly derived from @baseType.
 *
 * Returns 0 on success, an positive error code otherwise.
 */
static int
xmlSchemaCheckCOSDerivedOK(xmlSchemaAbstractCtxtPtr actxt,
                           xmlSchemaTypePtr type,
                           xmlSchemaTypePtr baseType,
                           int set)
{
    if (WXS_IS_SIMPLE(type))
        return (xmlSchemaCheckCOSSTDerivedOK(actxt, type, baseType, set));
    else
        return (xmlSchemaCheckCOSCTDerivedOK(actxt, type, baseType, set));
}

/**
 * xmlSchemaCheckCOSCTExtends:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 *
 * (3.4.6) Constraints on Complex Type Definition Schema Components
 * Schema Component Constraint:
 * Derivation Valid (Extension) (cos-ct-extends)
 *
 * STATUS:
 *   missing:
 *     (1.5)
 *     (1.4.3.2.2.2) "Particle Valid (Extension)"
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckCOSCTExtends(xmlSchemaParserCtxtPtr ctxt,
                           xmlSchemaTypePtr type)
{
    xmlSchemaTypePtr base = type->baseType;
    /*
    * TODO: Correct the error code; XML_SCHEMAP_COS_CT_EXTENDS_1_1 is used
    * temporarily only.
    */
    /*
    * SPEC (1) "If the {base type definition} is a complex type definition,
    * then all of the following must be true:"
    */
    if (WXS_IS_COMPLEX(base)) { 
        /*
        * SPEC (1.1) "The {final} of the {base type definition} must not
        * contain extension."
        */
        if (base->flags & XML_SCHEMAS_TYPE_FINAL_EXTENSION) {
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_COS_CT_EXTENDS_1_1,
                WXS_BASIC_CAST type, NULL,
                "The 'final' of the base type definition "
                "contains 'extension'", NULL);
            return (XML_SCHEMAP_COS_CT_EXTENDS_1_1);
        }
        
        /*
        * ATTENTION: The constrains (1.2) and (1.3) are not applied,
        * since they are automatically satisfied through the
        * inheriting mechanism.
        * Note that even if redefining components, the inheriting mechanism
        * is used.
        */
#if 0
        /*
        * SPEC (1.2) "Its {attribute uses} must be a subset of the {attribute
        * uses}
        * of the complex type definition itself, that is, for every attribute
        * use in the {attribute uses} of the {base type definition}, there
        * must be an attribute use in the {attribute uses} of the complex
        * type definition itself whose {attribute declaration} has the same
        * {name}, {target namespace} and {type definition} as its attribute
        * declaration"
        */
        if (base->attrUses != NULL) {
            int i, j, found;
            xmlSchemaAttributeUsePtr use, buse;

            for (i = 0; i < (WXS_LIST_CAST base->attrUses)->nbItems; i ++) {
                buse = (WXS_LIST_CAST base->attrUses)->items[i];
                found = 0;
                if (type->attrUses != NULL) {
                    use = (WXS_LIST_CAST type->attrUses)->items[j];
                    for (j = 0; j < (WXS_LIST_CAST type->attrUses)->nbItems; j ++)
                    {
                        if ((WXS_ATTRUSE_DECL_NAME(use) ==
                                WXS_ATTRUSE_DECL_NAME(buse)) &&
                            (WXS_ATTRUSE_DECL_TNS(use) ==
                                WXS_ATTRUSE_DECL_TNS(buse)) &&
                            (WXS_ATTRUSE_TYPEDEF(use) ==
                                WXS_ATTRUSE_TYPEDEF(buse))
                        {
                            found = 1;
                            break;
                        }
                    }
                }
                if (! found) {
                    xmlChar *str = NULL;
                
                    xmlSchemaCustomErr(ACTXT_CAST ctxt,
                        XML_SCHEMAP_COS_CT_EXTENDS_1_2,
                        NULL, WXS_BASIC_CAST type,
                        /* 
                        * TODO: The report does not indicate that also the
                        * type needs to be the same.
                        */
                        "This type is missing a matching correspondent "
                        "for its {base type}'s %s in its {attribute uses}",
                        xmlSchemaGetComponentDesignation(&str,
                            buse->children),
                        NULL);
                    FREE_AND_NULL(str)
                }
            }
        }
        /*
        * SPEC (1.3) "If it has an {attribute wildcard}, the complex type
        * definition must also have one, and the base type definition's
        * {attribute  wildcard}'s {namespace constraint} must be a subset
        * of the complex  type definition's {attribute wildcard}'s {namespace
        * constraint}, as defined by Wildcard Subset (§3.10.6)."
        */
  
        /*
        * MAYBE TODO: Enable if ever needed. But this will be needed only
        * if created the type via a schema construction API.
        */
        if (base->attributeWildcard != NULL) {
            if (type->attributeWilcard == NULL) {
                xmlChar *str = NULL;
                
                xmlSchemaCustomErr(ACTXT_CAST pctxt,
                    XML_SCHEMAP_COS_CT_EXTENDS_1_3,
                    NULL, type,
                    "The base %s has an attribute wildcard, "
                    "but this type is missing an attribute wildcard",
                    xmlSchemaGetComponentDesignation(&str, base));
                FREE_AND_NULL(str)

            } else if (xmlSchemaCheckCOSNSSubset(
                base->attributeWildcard, type->attributeWildcard))
            {
                xmlChar *str = NULL;
                
                xmlSchemaCustomErr(ACTXT_CAST pctxt,
                    XML_SCHEMAP_COS_CT_EXTENDS_1_3,
                    NULL, type,
                    "The attribute wildcard is not a valid "
                    "superset of the one in the base %s",
                    xmlSchemaGetComponentDesignation(&str, base));
                FREE_AND_NULL(str)
            }
        }
#endif
        /*
        * SPEC (1.4) "One of the following must be true:"
        */
        if ((type->contentTypeDef != NULL) &&
            (type->contentTypeDef == base->contentTypeDef)) {
            /*
            * SPEC (1.4.1) "The {content type} of the {base type definition}
            * and the {content type} of the complex type definition itself
            * must be the same simple type definition"
            * PASS
            */
        } else if ((type->contentType == XML_SCHEMA_CONTENT_EMPTY) &&
            (base->contentType == XML_SCHEMA_CONTENT_EMPTY) ) {
            /*
            * SPEC (1.4.2) "The {content type} of both the {base type
            * definition} and the complex type definition itself must
            * be empty."
            * PASS
            */
        } else {
            /*
            * SPEC (1.4.3) "All of the following must be true:"
            */
            if (type->subtypes == NULL) {
                /*
                * SPEC 1.4.3.1 The {content type} of the complex type
                * definition itself must specify a particle.
                */
                xmlSchemaPCustomErr(ctxt,
                    XML_SCHEMAP_COS_CT_EXTENDS_1_1,
                    WXS_BASIC_CAST type, NULL,
                    "The content type must specify a particle", NULL);
                return (XML_SCHEMAP_COS_CT_EXTENDS_1_1);
            }
            /*
            * SPEC (1.4.3.2) "One of the following must be true:"
            */
            if (base->contentType == XML_SCHEMA_CONTENT_EMPTY) {
                /*
                * SPEC (1.4.3.2.1) "The {content type} of the {base type
                * definition} must be empty.
                * PASS
                */
            } else {
                /*
                * SPEC (1.4.3.2.2) "All of the following must be true:"
                */
                if ((type->contentType != base->contentType) ||
                    ((type->contentType != XML_SCHEMA_CONTENT_MIXED) &&
                    (type->contentType != XML_SCHEMA_CONTENT_ELEMENTS))) {
                    /*
                    * SPEC (1.4.3.2.2.1) "Both {content type}s must be mixed
                    * or both must be element-only."
                    */
                    xmlSchemaPCustomErr(ctxt,
                        XML_SCHEMAP_COS_CT_EXTENDS_1_1,
                        WXS_BASIC_CAST type, NULL,
                        "The content type of both, the type and its base "
                        "type, must either 'mixed' or 'element-only'", NULL);
                    return (XML_SCHEMAP_COS_CT_EXTENDS_1_1);
                }
                /*
                * URGENT TODO SPEC (1.4.3.2.2.2) "The particle of the
                * complex type definition must be a ·valid extension·
                * of the {base type definition}'s particle, as defined
                * in Particle Valid (Extension) (§3.9.6)."
                *
                * NOTE that we won't check "Particle Valid (Extension)",
                * since it is ensured by the derivation process in
                * xmlSchemaTypeFixup(). We need to implement this when heading
                * for a construction API
                * TODO: !! This is needed to be checked if redefining a type !!
                */
            }
            /*
            * URGENT TODO (1.5)
            */
        }
    } else {
        /*
        * SPEC (2) "If the {base type definition} is a simple type definition,
        * then all of the following must be true:"
        */
        if (type->contentTypeDef != base) {
            /*
            * SPEC (2.1) "The {content type} must be the same simple type
            * definition."
            */
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_COS_CT_EXTENDS_1_1,
                WXS_BASIC_CAST type, NULL,
                "The content type must be the simple base type", NULL);
            return (XML_SCHEMAP_COS_CT_EXTENDS_1_1);
        }
        if (base->flags & XML_SCHEMAS_TYPE_FINAL_EXTENSION) {
            /*
            * SPEC (2.2) "The {final} of the {base type definition} must not
            * contain extension"
            * NOTE that this is the same as (1.1).
            */
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_COS_CT_EXTENDS_1_1,
                WXS_BASIC_CAST type, NULL,
                "The 'final' of the base type definition "
                "contains 'extension'", NULL);
            return (XML_SCHEMAP_COS_CT_EXTENDS_1_1);
        }
    }
    return (0);
}

/**
 * xmlSchemaCheckDerivationOKRestriction:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 *
 * (3.4.6) Constraints on Complex Type Definition Schema Components
 * Schema Component Constraint:
 * Derivation Valid (Restriction, Complex) (derivation-ok-restriction)
 *
 * STATUS:
 *   missing:
 *     (5.4.2) ???
 *
 * ATTENTION:
 * In XML Schema 1.1 this will be:
 * Validation Rule: Checking complex type subsumption
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckDerivationOKRestriction(xmlSchemaParserCtxtPtr ctxt,
                                      xmlSchemaTypePtr type)
{
    xmlSchemaTypePtr base;

    /*
    * TODO: Correct the error code; XML_SCHEMAP_DERIVATION_OK_RESTRICTION_1 is used
    * temporarily only.
    */
    base = type->baseType;
    if (! WXS_IS_COMPLEX(base)) {
        xmlSchemaCustomErr(ACTXT_CAST ctxt,         
            XML_SCHEMAP_DERIVATION_OK_RESTRICTION_1,
            type->node, WXS_BASIC_CAST type,
            "The base type must be a complex type", NULL, NULL);
        return(ctxt->err);
    }
    if (base->flags & XML_SCHEMAS_TYPE_FINAL_RESTRICTION) {
        /*
        * SPEC (1) "The {base type definition} must be a complex type
        * definition whose {final} does not contain restriction."
        */
        xmlSchemaCustomErr(ACTXT_CAST ctxt,         
            XML_SCHEMAP_DERIVATION_OK_RESTRICTION_1,
            type->node, WXS_BASIC_CAST type,
            "The 'final' of the base type definition "
            "contains 'restriction'", NULL, NULL);
        return (ctxt->err);
    }
    /*
    * SPEC (2), (3) and (4)
    * Those are handled in a separate function, since the
    * same constraints are needed for redefinition of
    * attribute groups as well.
    */
    if (xmlSchemaCheckDerivationOKRestriction2to4(ctxt,
        XML_SCHEMA_ACTION_DERIVE,
        WXS_BASIC_CAST type, WXS_BASIC_CAST base,
        type->attrUses, base->attrUses,
        type->attributeWildcard,
        base->attributeWildcard) == -1)
    {
        return(-1);
    }
    /*
    * SPEC (5) "One of the following must be true:"
    */
    if (base->builtInType == XML_SCHEMAS_ANYTYPE) {
        /*
        * SPEC (5.1) "The {base type definition} must be the
        * ·ur-type definition·."
        * PASS
        */
    } else if ((type->contentType == XML_SCHEMA_CONTENT_SIMPLE) ||
            (type->contentType == XML_SCHEMA_CONTENT_BASIC)) {
        /*
        * SPEC (5.2.1) "The {content type} of the complex type definition
        * must be a simple type definition"
        *
        * SPEC (5.2.2) "One of the following must be true:"
        */
        if ((base->contentType == XML_SCHEMA_CONTENT_SIMPLE) ||
            (base->contentType == XML_SCHEMA_CONTENT_BASIC))
        {
            int err;
            /*
            * SPEC (5.2.2.1) "The {content type} of the {base type
            * definition} must be a simple type definition from which
            * the {content type} is validly derived given the empty
            * set as defined in Type Derivation OK (Simple) (§3.14.6)."
            *
            * ATTENTION TODO: This seems not needed if the type implicitely
            * derived from the base type.
            * 
            */
            err = xmlSchemaCheckCOSSTDerivedOK(ACTXT_CAST ctxt,
                type->contentTypeDef, base->contentTypeDef, 0);
            if (err != 0) {
                xmlChar *strA = NULL, *strB = NULL;

                if (err == -1)
                    return(-1);
                xmlSchemaCustomErr(ACTXT_CAST ctxt,
                    XML_SCHEMAP_DERIVATION_OK_RESTRICTION_1,
                    NULL, WXS_BASIC_CAST type,
                    "The {content type} %s is not validly derived from the "
                    "base type's {content type} %s",
                    xmlSchemaGetComponentDesignation(&strA,
                        type->contentTypeDef),
                    xmlSchemaGetComponentDesignation(&strB,
                        base->contentTypeDef));
                FREE_AND_NULL(strA);
                FREE_AND_NULL(strB);
                return(ctxt->err);
            }
        } else if ((base->contentType == XML_SCHEMA_CONTENT_MIXED) &&
            (xmlSchemaIsParticleEmptiable(
                (xmlSchemaParticlePtr) base->subtypes))) {
            /*
            * SPEC (5.2.2.2) "The {base type definition} must be mixed
            * and have a particle which is ·emptiable· as defined in
            * Particle Emptiable (§3.9.6)."
            * PASS
            */
        } else {
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_DERIVATION_OK_RESTRICTION_1,
                WXS_BASIC_CAST type, NULL,
                "The content type of the base type must be either "
                "a simple type or 'mixed' and an emptiable particle", NULL);
            return (ctxt->err);
        }
    } else if (type->contentType == XML_SCHEMA_CONTENT_EMPTY) {
        /*
        * SPEC (5.3.1) "The {content type} of the complex type itself must
        * be empty"
        */
        if (base->contentType == XML_SCHEMA_CONTENT_EMPTY) {
            /*
            * SPEC (5.3.2.1) "The {content type} of the {base type
            * definition} must also be empty."
            * PASS
            */
        } else if (((base->contentType == XML_SCHEMA_CONTENT_ELEMENTS) ||
            (base->contentType == XML_SCHEMA_CONTENT_MIXED)) &&
            xmlSchemaIsParticleEmptiable(
                (xmlSchemaParticlePtr) base->subtypes)) {
            /*
            * SPEC (5.3.2.2) "The {content type} of the {base type
            * definition} must be elementOnly or mixed and have a particle
            * which is ·emptiable· as defined in Particle Emptiable (§3.9.6)."
            * PASS
            */
        } else {
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_DERIVATION_OK_RESTRICTION_1,
                WXS_BASIC_CAST type, NULL,
                "The content type of the base type must be either "
                "empty or 'mixed' (or 'elements-only') and an emptiable "
                "particle", NULL);
            return (ctxt->err);
        }
    } else if ((type->contentType == XML_SCHEMA_CONTENT_ELEMENTS) ||
        WXS_HAS_MIXED_CONTENT(type)) {
        /*
        * SPEC (5.4.1.1) "The {content type} of the complex type definition
        * itself must be element-only"
        */       
        if (WXS_HAS_MIXED_CONTENT(type) && (! WXS_HAS_MIXED_CONTENT(base))) {
            /*
            * SPEC (5.4.1.2) "The {content type} of the complex type
            * definition itself and of the {base type definition} must be
            * mixed"
            */
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_DERIVATION_OK_RESTRICTION_1,
                WXS_BASIC_CAST type, NULL,
                "If the content type is 'mixed', then the content type of the "
                "base type must also be 'mixed'", NULL);
            return (ctxt->err);
        }
        /*
        * SPEC (5.4.2) "The particle of the complex type definition itself
        * must be a ·valid restriction· of the particle of the {content
        * type} of the {base type definition} as defined in Particle Valid
        * (Restriction) (§3.9.6).
        *
        * URGENT TODO: (5.4.2)
        */
    } else {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_DERIVATION_OK_RESTRICTION_1,
            WXS_BASIC_CAST type, NULL,
            "The type is not a valid restriction of its base type", NULL);
        return (ctxt->err);
    }
    return (0);
}

/**
 * xmlSchemaCheckCTComponent:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 *
 * (3.4.6) Constraints on Complex Type Definition Schema Components
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckCTComponent(xmlSchemaParserCtxtPtr ctxt,
                          xmlSchemaTypePtr type)
{
    int ret;
    /*
    * Complex Type Definition Properties Correct
    */
    ret = xmlSchemaCheckCTPropsCorrect(ctxt, type);
    if (ret != 0)
        return (ret);
    if (WXS_IS_EXTENSION(type))
        ret = xmlSchemaCheckCOSCTExtends(ctxt, type);
    else
        ret = xmlSchemaCheckDerivationOKRestriction(ctxt, type);
    return (ret);
}

/**
 * xmlSchemaCheckSRCCT:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 *
 * (3.4.3) Constraints on XML Representations of Complex Type Definitions:
 * Schema Representation Constraint:
 * Complex Type Definition Representation OK (src-ct)
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckSRCCT(xmlSchemaParserCtxtPtr ctxt,
                    xmlSchemaTypePtr type)
{
    xmlSchemaTypePtr base;
    int ret = 0;

    /*
    * TODO: Adjust the error codes here, as I used
    * XML_SCHEMAP_SRC_CT_1 only yet.
    */
    base = type->baseType;
    if (! WXS_HAS_SIMPLE_CONTENT(type)) {
        /*
        * 1 If the <complexContent> alternative is chosen, the type definition
        * ·resolved· to by the ·actual value· of the base [attribute]
        * must be a complex type definition;
        */
        if (! WXS_IS_COMPLEX(base)) {
            xmlChar *str = NULL;
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_SRC_CT_1,
                WXS_BASIC_CAST type, type->node,
                "If using <complexContent>, the base type is expected to be "
                "a complex type. The base type '%s' is a simple type",
                xmlSchemaFormatQName(&str, base->targetNamespace,
                base->name));
            FREE_AND_NULL(str)
            return (XML_SCHEMAP_SRC_CT_1);
        }
    } else {
        /*
        * SPEC
        * 2 If the <simpleContent> alternative is chosen, all of the
        * following must be true:
        * 2.1 The type definition ·resolved· to by the ·actual value· of the
        * base [attribute] must be one of the following:
        */
        if (WXS_IS_SIMPLE(base)) {
            if (WXS_IS_EXTENSION(type) == 0) {
                xmlChar *str = NULL;
                /*
                * 2.1.3 only if the <extension> alternative is also
                * chosen, a simple type definition.
                */
                /* TODO: Change error code to ..._SRC_CT_2_1_3. */
                xmlSchemaPCustomErr(ctxt,
                    XML_SCHEMAP_SRC_CT_1,
                    WXS_BASIC_CAST type, NULL,
                    "If using <simpleContent> and <restriction>, the base "
                    "type must be a complex type. The base type '%s' is "
                    "a simple type",
                    xmlSchemaFormatQName(&str, base->targetNamespace,
                        base->name));
                FREE_AND_NULL(str)
                return (XML_SCHEMAP_SRC_CT_1);
            }
        } else {
            /* Base type is a complex type. */
            if ((base->contentType == XML_SCHEMA_CONTENT_SIMPLE) ||
                (base->contentType == XML_SCHEMA_CONTENT_BASIC)) {
                /*
                * 2.1.1 a complex type definition whose {content type} is a
                * simple type definition;
                * PASS
                */
                if (base->contentTypeDef == NULL) {
                    xmlSchemaPCustomErr(ctxt, XML_SCHEMAP_INTERNAL,
                        WXS_BASIC_CAST type, NULL,
                        "Internal error: xmlSchemaCheckSRCCT, "
                        "'%s', base type has no content type",
                        type->name);
                    return (-1);
                }
            } else if ((base->contentType == XML_SCHEMA_CONTENT_MIXED) &&
                (WXS_IS_RESTRICTION(type))) {

                /*
                * 2.1.2 only if the <restriction> alternative is also
                * chosen, a complex type definition whose {content type}
                * is mixed and a particle emptiable.
                */
                if (! xmlSchemaIsParticleEmptiable(
                    (xmlSchemaParticlePtr) base->subtypes)) {
                    ret = XML_SCHEMAP_SRC_CT_1;
                } else 
                    /*
                    * Attention: at this point the <simpleType> child is in
                    * ->contentTypeDef (put there during parsing).
                    */              
                    if (type->contentTypeDef == NULL) {
                    xmlChar *str = NULL;
                    /*
                    * 2.2 If clause 2.1.2 above is satisfied, then there
                    * must be a <simpleType> among the [children] of
                    * <restriction>.
                    */
                    /* TODO: Change error code to ..._SRC_CT_2_2. */
                    xmlSchemaPCustomErr(ctxt,
                        XML_SCHEMAP_SRC_CT_1,
                        WXS_BASIC_CAST type, NULL,
                        "A <simpleType> is expected among the children "
                        "of <restriction>, if <simpleContent> is used and "
                        "the base type '%s' is a complex type",
                        xmlSchemaFormatQName(&str, base->targetNamespace,
                        base->name));
                    FREE_AND_NULL(str)
                    return (XML_SCHEMAP_SRC_CT_1);
                }
            } else {
                ret = XML_SCHEMAP_SRC_CT_1;
            }
        }
        if (ret > 0) {
            xmlChar *str = NULL;
            if (WXS_IS_RESTRICTION(type)) {
                xmlSchemaPCustomErr(ctxt,
                    XML_SCHEMAP_SRC_CT_1,
                    WXS_BASIC_CAST type, NULL,
                    "If <simpleContent> and <restriction> is used, the "
                    "base type must be a simple type or a complex type with "
                    "mixed content and particle emptiable. The base type "
                    "'%s' is none of those",
                    xmlSchemaFormatQName(&str, base->targetNamespace,
                    base->name));
            } else {
                xmlSchemaPCustomErr(ctxt,
                    XML_SCHEMAP_SRC_CT_1,
                    WXS_BASIC_CAST type, NULL,
                    "If <simpleContent> and <extension> is used, the "
                    "base type must be a simple type. The base type '%s' "
                    "is a complex type",
                    xmlSchemaFormatQName(&str, base->targetNamespace,
                    base->name));
            }
            FREE_AND_NULL(str)
        }
    }
    /*
    * SPEC (3) "The corresponding complex type definition component must
    * satisfy the conditions set out in Constraints on Complex Type
    * Definition Schema Components (§3.4.6);"
    * NOTE (3) will be done in xmlSchemaTypeFixup().
    */
    /*
    * SPEC (4) If clause 2.2.1 or clause 2.2.2 in the correspondence specification
    * above for {attribute wildcard} is satisfied, the intensional
    * intersection must be expressible, as defined in Attribute Wildcard
    * Intersection (§3.10.6).
    * NOTE (4) is done in xmlSchemaFixupTypeAttributeUses().
    */
    return (ret);
}

#ifdef ENABLE_PARTICLE_RESTRICTION
/**
 * xmlSchemaCheckParticleRangeOK:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 *
 * (3.9.6) Constraints on Particle Schema Components
 * Schema Component Constraint:
 * Occurrence Range OK (range-ok)
 *
 * STATUS: complete
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckParticleRangeOK(int rmin, int rmax,
                              int bmin, int bmax)
{
    if (rmin < bmin)
        return (1);
    if ((bmax != UNBOUNDED) &&
        (rmax > bmax))
        return (1);
    return (0);
}

/**
 * xmlSchemaCheckRCaseNameAndTypeOK:
 * @ctxt:  the schema parser context
 * @r: the restricting element declaration particle
 * @b: the base element declaration particle
 *
 * (3.9.6) Constraints on Particle Schema Components
 * Schema Component Constraint:
 * Particle Restriction OK (Elt:Elt -- NameAndTypeOK)
 * (rcase-NameAndTypeOK)
 *
 * STATUS:
 *   MISSING (3.2.3)
 *   CLARIFY: (3.2.2)
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckRCaseNameAndTypeOK(xmlSchemaParserCtxtPtr ctxt,
                                 xmlSchemaParticlePtr r,
                                 xmlSchemaParticlePtr b)
{
    xmlSchemaElementPtr elemR, elemB;

    /* TODO: Error codes (rcase-NameAndTypeOK). */
    elemR = (xmlSchemaElementPtr) r->children;
    elemB = (xmlSchemaElementPtr) b->children;
    /*
    * SPEC (1) "The declarations' {name}s and {target namespace}s are
    * the same."
    */
    if ((elemR != elemB) &&
        ((! xmlStrEqual(elemR->name, elemB->name)) ||
        (! xmlStrEqual(elemR->targetNamespace, elemB->targetNamespace))))
        return (1);
    /*
    * SPEC (2) "R's occurrence range is a valid restriction of B's
    * occurrence range as defined by Occurrence Range OK (§3.9.6)."
    */
    if (xmlSchemaCheckParticleRangeOK(r->minOccurs, r->maxOccurs,
            b->minOccurs, b->maxOccurs) != 0)
        return (1);
    /*
    * SPEC (3.1) "Both B's declaration's {scope} and R's declaration's
    * {scope} are global."
    */
    if (elemR == elemB)
        return (0);
    /*
    * SPEC (3.2.1) "Either B's {nillable} is true or R's {nillable} is false."
    */
    if (((elemB->flags & XML_SCHEMAS_ELEM_NILLABLE) == 0) &&
        (elemR->flags & XML_SCHEMAS_ELEM_NILLABLE))
         return (1);
    /*
    * SPEC (3.2.2) "either B's declaration's {value constraint} is absent,
    * or is not fixed, or R's declaration's {value constraint} is fixed
    * with the same value."
    */
    if ((elemB->value != NULL) && (elemB->flags & XML_SCHEMAS_ELEM_FIXED) &&
        ((elemR->value == NULL) ||
         ((elemR->flags & XML_SCHEMAS_ELEM_FIXED) == 0) ||
         /* TODO: Equality of the initial value or normalized or canonical? */
         (! xmlStrEqual(elemR->value, elemB->value))))
         return (1);
    /*
    * TODO: SPEC (3.2.3) "R's declaration's {identity-constraint
    * definitions} is a subset of B's declaration's {identity-constraint
    * definitions}, if any."
    */
    if (elemB->idcs != NULL) {
        /* TODO */
    }
    /*
    * SPEC (3.2.4) "R's declaration's {disallowed substitutions} is a
    * superset of B's declaration's {disallowed substitutions}."
    */
    if (((elemB->flags & XML_SCHEMAS_ELEM_BLOCK_EXTENSION) &&
         ((elemR->flags & XML_SCHEMAS_ELEM_BLOCK_EXTENSION) == 0)) ||
        ((elemB->flags & XML_SCHEMAS_ELEM_BLOCK_RESTRICTION) &&
         ((elemR->flags & XML_SCHEMAS_ELEM_BLOCK_RESTRICTION) == 0)) ||
        ((elemB->flags & XML_SCHEMAS_ELEM_BLOCK_SUBSTITUTION) &&
         ((elemR->flags & XML_SCHEMAS_ELEM_BLOCK_SUBSTITUTION) == 0)))
         return (1);
    /*
    * SPEC (3.2.5) "R's {type definition} is validly derived given
    * {extension, list, union} from B's {type definition}"
    *
    * BADSPEC TODO: What's the point of adding "list" and "union" to the
    * set, if the corresponding constraints handle "restriction" and
    * "extension" only?
    *
    */
    {
        int set = 0;

        set |= SUBSET_EXTENSION;
        set |= SUBSET_LIST;
        set |= SUBSET_UNION;
        if (xmlSchemaCheckCOSDerivedOK(ACTXT_CAST ctxt, elemR->subtypes,
            elemB->subtypes, set) != 0)
            return (1);
    }
    return (0);
}

/**
 * xmlSchemaCheckRCaseNSCompat:
 * @ctxt:  the schema parser context
 * @r: the restricting element declaration particle
 * @b: the base wildcard particle
 *
 * (3.9.6) Constraints on Particle Schema Components
 * Schema Component Constraint:
 * Particle Derivation OK (Elt:Any -- NSCompat)
 * (rcase-NSCompat)
 *
 * STATUS: complete
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckRCaseNSCompat(xmlSchemaParserCtxtPtr ctxt,
                            xmlSchemaParticlePtr r,
                            xmlSchemaParticlePtr b)
{
    /* TODO:Error codes (rcase-NSCompat). */
    /*
    * SPEC "For an element declaration particle to be a ·valid restriction·
    * of a wildcard particle all of the following must be true:"
    *
    * SPEC (1) "The element declaration's {target namespace} is ·valid·
    * with respect to the wildcard's {namespace constraint} as defined by
    * Wildcard allows Namespace Name (§3.10.4)."
    */
    if (xmlSchemaCheckCVCWildcardNamespace((xmlSchemaWildcardPtr) b->children,
        ((xmlSchemaElementPtr) r->children)->targetNamespace) != 0)
        return (1);
    /*
    * SPEC (2) "R's occurrence range is a valid restriction of B's
    * occurrence range as defined by Occurrence Range OK (§3.9.6)."
    */
    if (xmlSchemaCheckParticleRangeOK(r->minOccurs, r->maxOccurs,
            b->minOccurs, b->maxOccurs) != 0)
        return (1);

    return (0);
}

/**
 * xmlSchemaCheckRCaseRecurseAsIfGroup:
 * @ctxt:  the schema parser context
 * @r: the restricting element declaration particle
 * @b: the base model group particle
 *
 * (3.9.6) Constraints on Particle Schema Components
 * Schema Component Constraint:
 * Particle Derivation OK (Elt:All/Choice/Sequence -- RecurseAsIfGroup)
 * (rcase-RecurseAsIfGroup)
 *
 * STATUS: TODO
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckRCaseRecurseAsIfGroup(xmlSchemaParserCtxtPtr ctxt,
                                    xmlSchemaParticlePtr r,
                                    xmlSchemaParticlePtr b)
{
    /* TODO: Error codes (rcase-RecurseAsIfGroup). */
    TODO
    return (0);
}

/**
 * xmlSchemaCheckRCaseNSSubset:
 * @ctxt:  the schema parser context
 * @r: the restricting wildcard particle
 * @b: the base wildcard particle
 *
 * (3.9.6) Constraints on Particle Schema Components
 * Schema Component Constraint:
 * Particle Derivation OK (Any:Any -- NSSubset)
 * (rcase-NSSubset)
 *
 * STATUS: complete
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckRCaseNSSubset(xmlSchemaParserCtxtPtr ctxt,
                                    xmlSchemaParticlePtr r,
                                    xmlSchemaParticlePtr b,
                                    int isAnyTypeBase)
{
    /* TODO: Error codes (rcase-NSSubset). */
    /*
    * SPEC (1) "R's occurrence range is a valid restriction of B's
    * occurrence range as defined by Occurrence Range OK (§3.9.6)."
    */
    if (xmlSchemaCheckParticleRangeOK(r->minOccurs, r->maxOccurs,
            b->minOccurs, b->maxOccurs))
        return (1);
    /*
    * SPEC (2) "R's {namespace constraint} must be an intensional subset
    * of B's {namespace constraint} as defined by Wildcard Subset (§3.10.6)."
    */
    if (xmlSchemaCheckCOSNSSubset((xmlSchemaWildcardPtr) r->children,
        (xmlSchemaWildcardPtr) b->children))
        return (1);
    /*
    * SPEC (3) "Unless B is the content model wildcard of the ·ur-type
    * definition·, R's {process contents} must be identical to or stronger
    * than B's {process contents}, where strict is stronger than lax is
    * stronger than skip."
    */
    if (! isAnyTypeBase) {
        if ( ((xmlSchemaWildcardPtr) r->children)->processContents <
            ((xmlSchemaWildcardPtr) b->children)->processContents)
            return (1);
    }

    return (0);
}

/**
 * xmlSchemaCheckCOSParticleRestrict:
 * @ctxt:  the schema parser context
 * @type:  the complex type definition
 *
 * (3.9.6) Constraints on Particle Schema Components
 * Schema Component Constraint:
 * Particle Valid (Restriction) (cos-particle-restrict)
 *
 * STATUS: TODO
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckCOSParticleRestrict(xmlSchemaParserCtxtPtr ctxt,
                                  xmlSchemaParticlePtr r,
                                  xmlSchemaParticlePtr b)
{
    int ret = 0;

    /*part = WXS_TYPE_PARTICLE(type);
    basePart = WXS_TYPE_PARTICLE(base);
    */

    TODO

    /*
    * SPEC (1) "They are the same particle."
    */
    if (r == b)
        return (0);


    return (0);
}

/**
 * xmlSchemaCheckRCaseNSRecurseCheckCardinality:
 * @ctxt:  the schema parser context
 * @r: the model group particle
 * @b: the base wildcard particle
 *
 * (3.9.6) Constraints on Particle Schema Components
 * Schema Component Constraint:
 * Particle Derivation OK (All/Choice/Sequence:Any --
 *                         NSRecurseCheckCardinality)
 * (rcase-NSRecurseCheckCardinality)
 *
 * STATUS: TODO: subst-groups
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckRCaseNSRecurseCheckCardinality(xmlSchemaParserCtxtPtr ctxt,
                                             xmlSchemaParticlePtr r,
                                             xmlSchemaParticlePtr b)
{
    xmlSchemaParticlePtr part;
    /* TODO: Error codes (rcase-NSRecurseCheckCardinality). */
    if ((r->children == NULL) || (r->children->children == NULL))
        return (-1);
    /*
    * SPEC "For a group particle to be a ·valid restriction· of a
    * wildcard particle..."
    *
    * SPEC (1) "Every member of the {particles} of the group is a ·valid
    * restriction· of the wildcard as defined by
    * Particle Valid (Restriction) (§3.9.6)."
    */
    part = (xmlSchemaParticlePtr) r->children->children;
    do {
        if (xmlSchemaCheckCOSParticleRestrict(ctxt, part, b))
            return (1);
        part = (xmlSchemaParticlePtr) part->next;
    } while (part != NULL);
    /*
    * SPEC (2) "The effective total range of the group [...] is a
    * valid restriction of B's occurrence range as defined by
    * Occurrence Range OK (§3.9.6)."
    */
    if (xmlSchemaCheckParticleRangeOK(
            xmlSchemaGetParticleTotalRangeMin(r),
            xmlSchemaGetParticleTotalRangeMax(r),
            b->minOccurs, b->maxOccurs) != 0)
        return (1);
    return (0);
}

/**
 * xmlSchemaCheckRCaseRecurse:
 * @ctxt:  the schema parser context
 * @r: the <all> or <sequence> model group particle
 * @b: the base <all> or <sequence> model group particle
 *
 * (3.9.6) Constraints on Particle Schema Components
 * Schema Component Constraint:
 * Particle Derivation OK (All:All,Sequence:Sequence --
                           Recurse)
 * (rcase-Recurse)
 *
 * STATUS:  ?
 * TODO: subst-groups
 *
 * Returns 0 if the constraints are satisfied, a positive
 * error code if not and -1 if an internal error occured.
 */
static int
xmlSchemaCheckRCaseRecurse(xmlSchemaParserCtxtPtr ctxt,
                           xmlSchemaParticlePtr r,
                           xmlSchemaParticlePtr b)
{
    /* xmlSchemaParticlePtr part; */
    /* TODO: Error codes (rcase-Recurse). */
    if ((r->children == NULL) || (b->children == NULL) ||
        (r->children->type != b->children->type))
        return (-1);
    /*
    * SPEC "For an all or sequence group particle to be a ·valid
    * restriction· of another group particle with the same {compositor}..."
    *
    * SPEC (1) "R's occurrence range is a valid restriction of B's
    * occurrence range as defined by Occurrence Range OK (§3.9.6)."
    */
    if (xmlSchemaCheckParticleRangeOK(r->minOccurs, r->maxOccurs,
            b->minOccurs, b->maxOccurs))
        return (1);


    return (0);
}

#endif

#define FACET_RESTR_MUTUAL_ERR(fac1, fac2) \
    xmlSchemaPCustomErrExt(pctxt,      \
        XML_SCHEMAP_INVALID_FACET_VALUE, \
        WXS_BASIC_CAST fac1, fac1->node, \
        "It is an error for both '%s' and '%s' to be specified on the "\
        "same type definition", \
        BAD_CAST xmlSchemaFacetTypeToString(fac1->type), \
        BAD_CAST xmlSchemaFacetTypeToString(fac2->type), NULL);

#define FACET_RESTR_ERR(fac1, msg) \
    xmlSchemaPCustomErr(pctxt,      \
        XML_SCHEMAP_INVALID_FACET_VALUE, \
        WXS_BASIC_CAST fac1, fac1->node, \
        msg, NULL);

#define FACET_RESTR_FIXED_ERR(fac) \
    xmlSchemaPCustomErr(pctxt, \
        XML_SCHEMAP_INVALID_FACET_VALUE, \
        WXS_BASIC_CAST fac, fac->node, \
        "The base type's facet is 'fixed', thus the value must not " \
        "differ", NULL);

static void
xmlSchemaDeriveFacetErr(xmlSchemaParserCtxtPtr pctxt,
                        xmlSchemaFacetPtr facet1,
                        xmlSchemaFacetPtr facet2,
                        int lessGreater,
                        int orEqual,
                        int ofBase)
{
    xmlChar *msg = NULL;

    msg = xmlStrdup(BAD_CAST "'");
    msg = xmlStrcat(msg, xmlSchemaFacetTypeToString(facet1->type));
    msg = xmlStrcat(msg, BAD_CAST "' has to be");
    if (lessGreater == 0)
        msg = xmlStrcat(msg, BAD_CAST " equal to");
    if (lessGreater == 1)
        msg = xmlStrcat(msg, BAD_CAST " greater than");
    else
        msg = xmlStrcat(msg, BAD_CAST " less than");

    if (orEqual)
        msg = xmlStrcat(msg, BAD_CAST " or equal to");
    msg = xmlStrcat(msg, BAD_CAST " '");
    msg = xmlStrcat(msg, xmlSchemaFacetTypeToString(facet2->type));
    if (ofBase)
        msg = xmlStrcat(msg, BAD_CAST "' of the base type");
    else
        msg = xmlStrcat(msg, BAD_CAST "'");

    xmlSchemaPCustomErr(pctxt,
        XML_SCHEMAP_INVALID_FACET_VALUE,
        WXS_BASIC_CAST facet1, NULL,
        (const char *) msg, NULL);

    if (msg != NULL)
        xmlFree(msg);
}

/*
* xmlSchemaDeriveAndValidateFacets:
*
* Schema Component Constraint: Simple Type Restriction (Facets)
* (st-restrict-facets)
*/
static int
xmlSchemaDeriveAndValidateFacets(xmlSchemaParserCtxtPtr pctxt,
                                 xmlSchemaTypePtr type)
{
    xmlSchemaTypePtr base = type->baseType;
    xmlSchemaFacetLinkPtr link, cur, last = NULL;
    xmlSchemaFacetPtr facet, bfacet,
        flength = NULL, ftotdig = NULL, ffracdig = NULL,
        fmaxlen = NULL, fminlen = NULL, /* facets of the current type */
        fmininc = NULL, fmaxinc = NULL,
        fminexc = NULL, fmaxexc = NULL,
        bflength = NULL, bftotdig = NULL, bffracdig = NULL,
        bfmaxlen = NULL, bfminlen = NULL, /* facets of the base type */
        bfmininc = NULL, bfmaxinc = NULL,
        bfminexc = NULL, bfmaxexc = NULL;
    int res; /* err = 0, fixedErr; */

    /*
    * SPEC st-restrict-facets 1:
    * "The {variety} of R is the same as that of B."    
    */
    /*
    * SPEC st-restrict-facets 2:
    * "If {variety} is atomic, the {primitive type definition}
    * of R is the same as that of B."
    *
    * NOTE: we leave 1 & 2 out for now, since this will be
    * satisfied by the derivation process.
    * CONSTRUCTION TODO: Maybe needed if using a construction API.
    */
    /*
    * SPEC st-restrict-facets 3:
    * "The {facets} of R are the union of S and the {facets}
    * of B, eliminating duplicates. To eliminate duplicates,
    * when a facet of the same kind occurs in both S and the
    * {facets} of B, the one in the {facets} of B is not
    * included, with the exception of enumeration and pattern
    * facets, for which multiple occurrences with distinct values
    * are allowed."
    */

    if ((type->facetSet == NULL) && (base->facetSet == NULL))
        return (0);

    last = type->facetSet;
    if (last != NULL)
        while (last->next != NULL)
            last = last->next;

    for (cur = type->facetSet; cur != NULL; cur = cur->next) {
        facet = cur->facet;
        switch (facet->type) {
            case XML_SCHEMA_FACET_LENGTH:
                flength = facet; break;
            case XML_SCHEMA_FACET_MINLENGTH:
                fminlen = facet; break;
            case XML_SCHEMA_FACET_MININCLUSIVE:
                fmininc = facet; break;
            case XML_SCHEMA_FACET_MINEXCLUSIVE:
                fminexc = facet; break;
            case XML_SCHEMA_FACET_MAXLENGTH:
                fmaxlen = facet; break;
            case XML_SCHEMA_FACET_MAXINCLUSIVE:
                fmaxinc = facet; break;
            case XML_SCHEMA_FACET_MAXEXCLUSIVE:
                fmaxexc = facet; break;
            case XML_SCHEMA_FACET_TOTALDIGITS:
                ftotdig = facet; break;
            case XML_SCHEMA_FACET_FRACTIONDIGITS:
                ffracdig = facet; break;
            default:
                break;
        }
    }
    for (cur = base->facetSet; cur != NULL; cur = cur->next) {
        facet = cur->facet;
        switch (facet->type) {
            case XML_SCHEMA_FACET_LENGTH:
                bflength = facet; break;
            case XML_SCHEMA_FACET_MINLENGTH:
                bfminlen = facet; break;
            case XML_SCHEMA_FACET_MININCLUSIVE:
                bfmininc = facet; break;
            case XML_SCHEMA_FACET_MINEXCLUSIVE:
                bfminexc = facet; break;
            case XML_SCHEMA_FACET_MAXLENGTH:
                bfmaxlen = facet; break;
            case XML_SCHEMA_FACET_MAXINCLUSIVE:
                bfmaxinc = facet; break;
            case XML_SCHEMA_FACET_MAXEXCLUSIVE:
                bfmaxexc = facet; break;
            case XML_SCHEMA_FACET_TOTALDIGITS:
                bftotdig = facet; break;
            case XML_SCHEMA_FACET_FRACTIONDIGITS:
                bffracdig = facet; break;
            default:
                break;
        }
    }
    /*
    * length and minLength or maxLength (2.2) + (3.2)
    */
    if (flength && (fminlen || fmaxlen)) {
        FACET_RESTR_ERR(flength, "It is an error for both 'length' and "
            "either of 'minLength' or 'maxLength' to be specified on "
            "the same type definition")
    }
    /*
    * Mutual exclusions in the same derivation step.
    */
    if ((fmaxinc) && (fmaxexc)) {
        /*
        * SCC "maxInclusive and maxExclusive"
        */
        FACET_RESTR_MUTUAL_ERR(fmaxinc, fmaxexc)
    }
    if ((fmininc) && (fminexc)) {
        /*
        * SCC "minInclusive and minExclusive"
        */
        FACET_RESTR_MUTUAL_ERR(fmininc, fminexc)
    }

    if (flength && bflength) {
        /*
        * SCC "length valid restriction"
        * The values have to be equal.
        */
        res = xmlSchemaCompareValues(flength->val, bflength->val);
        if (res == -2)
            goto internal_error;
        if (res != 0)
            xmlSchemaDeriveFacetErr(pctxt, flength, bflength, 0, 0, 1);
        if ((res != 0) && (bflength->fixed)) {
            FACET_RESTR_FIXED_ERR(flength)
        }

    }
    if (fminlen && bfminlen) {
        /*
        * SCC "minLength valid restriction"
        * minLength >= BASE minLength
        */
        res = xmlSchemaCompareValues(fminlen->val, bfminlen->val);
        if (res == -2)
            goto internal_error;
        if (res == -1)
            xmlSchemaDeriveFacetErr(pctxt, fminlen, bfminlen, 1, 1, 1);
        if ((res != 0) && (bfminlen->fixed)) {
            FACET_RESTR_FIXED_ERR(fminlen)
        }
    }
    if (fmaxlen && bfmaxlen) {
        /*
        * SCC "maxLength valid restriction"
        * maxLength <= BASE minLength
        */
        res = xmlSchemaCompareValues(fmaxlen->val, bfmaxlen->val);
        if (res == -2)
            goto internal_error;
        if (res == 1)
            xmlSchemaDeriveFacetErr(pctxt, fmaxlen, bfmaxlen, -1, 1, 1);
        if ((res != 0) && (bfmaxlen->fixed)) {
            FACET_RESTR_FIXED_ERR(fmaxlen)
        }
    }
    /*
    * SCC "length and minLength or maxLength"
    */
    if (! flength)
        flength = bflength;
    if (flength) {
        if (! fminlen)
            flength = bflength;
        if (fminlen) {
            /* (1.1) length >= minLength */
            res = xmlSchemaCompareValues(flength->val, fminlen->val);
            if (res == -2)
                goto internal_error;
            if (res == -1)
                xmlSchemaDeriveFacetErr(pctxt, flength, fminlen, 1, 1, 0);
        }
        if (! fmaxlen)
            fmaxlen = bfmaxlen;
        if (fmaxlen) {
            /* (2.1) length <= maxLength */
            res = xmlSchemaCompareValues(flength->val, fmaxlen->val);
            if (res == -2)
                goto internal_error;
            if (res == 1)
                xmlSchemaDeriveFacetErr(pctxt, flength, fmaxlen, -1, 1, 0);
        }
    }
    if (fmaxinc) {
        /*
        * "maxInclusive"
        */
        if (fmininc) {
            /* SCC "maxInclusive >= minInclusive" */
            res = xmlSchemaCompareValues(fmaxinc->val, fmininc->val);
            if (res == -2)
                goto internal_error;
            if (res == -1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxinc, fmininc, 1, 1, 0);
            }
        }
        /*
        * SCC "maxInclusive valid restriction"
        */
        if (bfmaxinc) {
            /* maxInclusive <= BASE maxInclusive */
            res = xmlSchemaCompareValues(fmaxinc->val, bfmaxinc->val);
            if (res == -2)
                goto internal_error;
            if (res == 1)
                xmlSchemaDeriveFacetErr(pctxt, fmaxinc, bfmaxinc, -1, 1, 1);
            if ((res != 0) && (bfmaxinc->fixed)) {
                FACET_RESTR_FIXED_ERR(fmaxinc)
            }
        }
        if (bfmaxexc) {
            /* maxInclusive < BASE maxExclusive */
            res = xmlSchemaCompareValues(fmaxinc->val, bfmaxexc->val);
            if (res == -2)
                goto internal_error;
            if (res != -1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxinc, bfmaxexc, -1, 0, 1);
            }
        }
        if (bfmininc) {
            /* maxInclusive >= BASE minInclusive */
            res = xmlSchemaCompareValues(fmaxinc->val, bfmininc->val);
            if (res == -2)
                goto internal_error;
            if (res == -1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxinc, bfmininc, 1, 1, 1);
            }
        }
        if (bfminexc) {
            /* maxInclusive > BASE minExclusive */
            res = xmlSchemaCompareValues(fmaxinc->val, bfminexc->val);
            if (res == -2)
                goto internal_error;
            if (res != 1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxinc, bfminexc, 1, 0, 1);
            }
        }
    }
    if (fmaxexc) {
        /*
        * "maxExclusive >= minExclusive"
        */
        if (fminexc) {
            res = xmlSchemaCompareValues(fmaxexc->val, fminexc->val);
            if (res == -2)
                goto internal_error;
            if (res == -1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxexc, fminexc, 1, 1, 0);
            }
        }
        /*
        * "maxExclusive valid restriction"
        */
        if (bfmaxexc) {
            /* maxExclusive <= BASE maxExclusive */
            res = xmlSchemaCompareValues(fmaxexc->val, bfmaxexc->val);
            if (res == -2)
                goto internal_error;
            if (res == 1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxexc, bfmaxexc, -1, 1, 1);
            }
            if ((res != 0) && (bfmaxexc->fixed)) {
                FACET_RESTR_FIXED_ERR(fmaxexc)
            }
        }
        if (bfmaxinc) {
            /* maxExclusive <= BASE maxInclusive */
            res = xmlSchemaCompareValues(fmaxexc->val, bfmaxinc->val);
            if (res == -2)
                goto internal_error;
            if (res == 1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxexc, bfmaxinc, -1, 1, 1);
            }
        }
        if (bfmininc) {
            /* maxExclusive > BASE minInclusive */
            res = xmlSchemaCompareValues(fmaxexc->val, bfmininc->val);
            if (res == -2)
                goto internal_error;
            if (res != 1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxexc, bfmininc, 1, 0, 1);
            }
        }
        if (bfminexc) {
            /* maxExclusive > BASE minExclusive */
            res = xmlSchemaCompareValues(fmaxexc->val, bfminexc->val);
            if (res == -2)
                goto internal_error;
            if (res != 1) {
                xmlSchemaDeriveFacetErr(pctxt, fmaxexc, bfminexc, 1, 0, 1);
            }
        }
    }
    if (fminexc) {
        /*
        * "minExclusive < maxInclusive"
        */
        if (fmaxinc) {
            res = xmlSchemaCompareValues(fminexc->val, fmaxinc->val);
            if (res == -2)
                goto internal_error;
            if (res != -1) {
                xmlSchemaDeriveFacetErr(pctxt, fminexc, fmaxinc, -1, 0, 0);
            }
        }
        /*
        * "minExclusive valid restriction"
        */
        if (bfminexc) {
            /* minExclusive >= BASE minExclusive */
            res = xmlSchemaCompareValues(fminexc->val, bfminexc->val);
            if (res == -2)
                goto internal_error;
            if (res == -1) {
                xmlSchemaDeriveFacetErr(pctxt, fminexc, bfminexc, 1, 1, 1);
            }
            if ((res != 0) && (bfminexc->fixed)) {
                FACET_RESTR_FIXED_ERR(fminexc)
            }
        }
        if (bfmaxinc) {
            /* minExclusive <= BASE maxInclusive */
            res = xmlSchemaCompareValues(fminexc->val, bfmaxinc->val);
            if (res == -2)
                goto internal_error;
            if (res == 1) {
                xmlSchemaDeriveFacetErr(pctxt, fminexc, bfmaxinc, -1, 1, 1);
            }
        }
        if (bfmininc) {
            /* minExclusive >= BASE minInclusive */
            res = xmlSchemaCompareValues(fminexc->val, bfmininc->val);
            if (res == -2)
                goto internal_error;
            if (res == -1) {
                xmlSchemaDeriveFacetErr(pctxt, fminexc, bfmininc, 1, 1, 1);
            }
        }
        if (bfmaxexc) {
            /* minExclusive < BASE maxExclusive */
            res = xmlSchemaCompareValues(fminexc->val, bfmaxexc->val);
            if (res == -2)
                goto internal_error;
            if (res != -1) {
                xmlSchemaDeriveFacetErr(pctxt, fminexc, bfmaxexc, -1, 0, 1);
            }
        }
    }
    if (fmininc) {
        /*
        * "minInclusive < maxExclusive"
        */
        if (fmaxexc) {
            res = xmlSchemaCompareValues(fmininc->val, fmaxexc->val);
            if (res == -2)
                goto internal_error;
            if (res != -1) {
                xmlSchemaDeriveFacetErr(pctxt, fmininc, fmaxexc, -1, 0, 0);
            }
        }
        /*
        * "minExclusive valid restriction"
        */
        if (bfmininc) {
            /* minInclusive >= BASE minInclusive */
            res = xmlSchemaCompareValues(fmininc->val, bfmininc->val);
            if (res == -2)
                goto internal_error;
            if (res == -1) {
                xmlSchemaDeriveFacetErr(pctxt, fmininc, bfmininc, 1, 1, 1);
            }
            if ((res != 0) && (bfmininc->fixed)) {
                FACET_RESTR_FIXED_ERR(fmininc)
            }
        }
        if (bfmaxinc) {
            /* minInclusive <= BASE maxInclusive */
            res = xmlSchemaCompareValues(fmininc->val, bfmaxinc->val);
            if (res == -2)
                goto internal_error;
            if (res == 1) {
                xmlSchemaDeriveFacetErr(pctxt, fmininc, bfmaxinc, -1, 1, 1);
            }
        }
        if (bfminexc) {
            /* minInclusive > BASE minExclusive */
            res = xmlSchemaCompareValues(fmininc->val, bfminexc->val);
            if (res == -2)
                goto internal_error;
            if (res != 1)
                xmlSchemaDeriveFacetErr(pctxt, fmininc, bfminexc, 1, 0, 1);
        }
        if (bfmaxexc) {
            /* minInclusive < BASE maxExclusive */
            res = xmlSchemaCompareValues(fmininc->val, bfmaxexc->val);
            if (res == -2)
                goto internal_error;
            if (res != -1)
                xmlSchemaDeriveFacetErr(pctxt, fmininc, bfmaxexc, -1, 0, 1);
        }
    }
    if (ftotdig && bftotdig) {
        /*
        * SCC " totalDigits valid restriction"
        * totalDigits <= BASE totalDigits
        */
        res = xmlSchemaCompareValues(ftotdig->val, bftotdig->val);
        if (res == -2)
            goto internal_error;
        if (res == 1)
            xmlSchemaDeriveFacetErr(pctxt, ftotdig, bftotdig,
            -1, 1, 1);
        if ((res != 0) && (bftotdig->fixed)) {
            FACET_RESTR_FIXED_ERR(ftotdig)
        }
    }
    if (ffracdig && bffracdig) {
        /*
        * SCC  "fractionDigits valid restriction"
        * fractionDigits <= BASE fractionDigits
        */
        res = xmlSchemaCompareValues(ffracdig->val, bffracdig->val);
        if (res == -2)
            goto internal_error;
        if (res == 1)
            xmlSchemaDeriveFacetErr(pctxt, ffracdig, bffracdig,
            -1, 1, 1);
        if ((res != 0) && (bffracdig->fixed)) {
            FACET_RESTR_FIXED_ERR(ffracdig)
        }
    }
    /*
    * SCC "fractionDigits less than or equal to totalDigits"
    */
    if (! ftotdig)
        ftotdig = bftotdig;
    if (! ffracdig)
        ffracdig = bffracdig;
    if (ftotdig && ffracdig) {
        res = xmlSchemaCompareValues(ffracdig->val, ftotdig->val);
        if (res == -2)
            goto internal_error;
        if (res == 1)
            xmlSchemaDeriveFacetErr(pctxt, ffracdig, ftotdig,
                -1, 1, 0);
    }
    /*
    * *Enumerations* won' be added here, since only the first set
    * of enumerations in the ancestor-or-self axis is used
    * for validation, plus we need to use the base type of those
    * enumerations for whitespace.
    *
    * *Patterns*: won't be add here, since they are ORed at
    * type level and ANDed at ancestor level. This will
    * happed during validation by walking the base axis
    * of the type.
    */
    for (cur = base->facetSet; cur != NULL; cur = cur->next) {
        bfacet = cur->facet;
        /*
        * Special handling of enumerations and patterns.
        * TODO: hmm, they should not appear in the set, so remove this.
        */
        if ((bfacet->type == XML_SCHEMA_FACET_PATTERN) ||
            (bfacet->type == XML_SCHEMA_FACET_ENUMERATION))
            continue;
        /*
        * Search for a duplicate facet in the current type.
        */
        link = type->facetSet;
        /* err = 0; */
        /* fixedErr = 0; */
        while (link != NULL) {
            facet = link->facet;
            if (facet->type == bfacet->type) {
                switch (facet->type) {
                    case XML_SCHEMA_FACET_WHITESPACE:
                        /*
                        * The whitespace must be stronger.
                        */
                        if (facet->whitespace < bfacet->whitespace) {
                            FACET_RESTR_ERR(flength,
                                "The 'whitespace' value has to be equal to "
                                "or stronger than the 'whitespace' value of "
                                "the base type")
                        }
                        if ((bfacet->fixed) &&
                            (facet->whitespace != bfacet->whitespace)) {
                            FACET_RESTR_FIXED_ERR(facet)
                        }
                        break;
                    default:
                        break;
                }
                /* Duplicate found. */
                break;
            }
            link = link->next;
        }
        /*
        * If no duplicate was found: add the base types's facet
        * to the set.
        */
        if (link == NULL) {
            link = (xmlSchemaFacetLinkPtr)
                xmlMalloc(sizeof(xmlSchemaFacetLink));
            if (link == NULL) {
                xmlSchemaPErrMemory(pctxt,
                    "deriving facets, creating a facet link", NULL);
                return (-1);
            }
            link->facet = cur->facet;
            link->next = NULL;
            if (last == NULL)
                type->facetSet = link;
            else
                last->next = link;
            last = link;
        }

    }

    return (0);
internal_error:
    PERROR_INT("xmlSchemaDeriveAndValidateFacets",
        "an error occured");
    return (-1);
}

static int
xmlSchemaFinishMemberTypeDefinitionsProperty(xmlSchemaParserCtxtPtr pctxt,
                                             xmlSchemaTypePtr type)
{
    xmlSchemaTypeLinkPtr link, lastLink, prevLink, subLink, newLink;
    /*
    * The actual value is then formed by replacing any union type
    * definition in the ·explicit members· with the members of their
    * {member type definitions}, in order.
    *
    * TODO: There's a bug entry at
    * "http://lists.w3.org/Archives/Public/www-xml-schema-comments/2005JulSep/0287.html"
    * which indicates that we'll keep the union types the future.
    */
    link = type->memberTypes;
    while (link != NULL) {

        if (WXS_IS_TYPE_NOT_FIXED(link->type))
            xmlSchemaTypeFixup(link->type, ACTXT_CAST pctxt);

        if (WXS_IS_UNION(link->type)) {
            subLink = xmlSchemaGetUnionSimpleTypeMemberTypes(link->type);
            if (subLink != NULL) {
                link->type = subLink->type;
                if (subLink->next != NULL) {
                    lastLink = link->next;
                    subLink = subLink->next;
                    prevLink = link;
                    while (subLink != NULL) {
                        newLink = (xmlSchemaTypeLinkPtr)
                            xmlMalloc(sizeof(xmlSchemaTypeLink));
                        if (newLink == NULL) {
                            xmlSchemaPErrMemory(pctxt, "allocating a type link",
                                NULL);
                            return (-1);
                        }
                        newLink->type = subLink->type;
                        prevLink->next = newLink;
                        prevLink = newLink;
                        newLink->next = lastLink;

                        subLink = subLink->next;
                    }
                }
            }
        }
        link = link->next;
    }
    return (0);
}

static void
xmlSchemaTypeFixupOptimFacets(xmlSchemaTypePtr type)
{       
    int has = 0, needVal = 0, normVal = 0;

    has = (type->baseType->flags & XML_SCHEMAS_TYPE_HAS_FACETS) ? 1 : 0;
    if (has) {
        needVal = (type->baseType->flags &
            XML_SCHEMAS_TYPE_FACETSNEEDVALUE) ? 1 : 0;
        normVal = (type->baseType->flags &
            XML_SCHEMAS_TYPE_NORMVALUENEEDED) ? 1 : 0;
    }
    if (type->facets != NULL) {
        xmlSchemaFacetPtr fac;
        
        for (fac = type->facets; fac != NULL; fac = fac->next) {
            switch (fac->type) {
                case XML_SCHEMA_FACET_WHITESPACE:
                    break;
                case XML_SCHEMA_FACET_PATTERN:
                    normVal = 1;
                    has = 1;
                    break;
                case XML_SCHEMA_FACET_ENUMERATION:
                    needVal = 1;
                    normVal = 1;
                    has = 1;
                    break;
                default:
                    has = 1;
                    break;
            }
        }       
    }
    if (normVal)
        type->flags |= XML_SCHEMAS_TYPE_NORMVALUENEEDED;
    if (needVal)
        type->flags |= XML_SCHEMAS_TYPE_FACETSNEEDVALUE;
    if (has)
        type->flags |= XML_SCHEMAS_TYPE_HAS_FACETS;

    if (has && (! needVal) && WXS_IS_ATOMIC(type)) {
        xmlSchemaTypePtr prim = xmlSchemaGetPrimitiveType(type);
        /*
        * OPTIMIZE VAL TODO: Some facets need a computed value.
        */
        if ((prim->builtInType != XML_SCHEMAS_ANYSIMPLETYPE) &&
            (prim->builtInType != XML_SCHEMAS_STRING)) {
            type->flags |= XML_SCHEMAS_TYPE_FACETSNEEDVALUE;
        }       
    }       
}

static int
xmlSchemaTypeFixupWhitespace(xmlSchemaTypePtr type)
{
    
    
    /*
    * Evaluate the whitespace-facet value.
    */    
    if (WXS_IS_LIST(type)) {
        type->flags |= XML_SCHEMAS_TYPE_WHITESPACE_COLLAPSE;
        return (0);
    } else if (WXS_IS_UNION(type))
        return (0);
    
    if (type->facetSet != NULL) {
        xmlSchemaFacetLinkPtr lin;

        for (lin = type->facetSet; lin != NULL; lin = lin->next) {
            if (lin->facet->type == XML_SCHEMA_FACET_WHITESPACE) {
                switch (lin->facet->whitespace) {
                case XML_SCHEMAS_FACET_PRESERVE:
                    type->flags |= XML_SCHEMAS_TYPE_WHITESPACE_PRESERVE;
                    break;
                case XML_SCHEMAS_FACET_REPLACE:
                    type->flags |= XML_SCHEMAS_TYPE_WHITESPACE_REPLACE;
                    break;
                case XML_SCHEMAS_FACET_COLLAPSE:
                    type->flags |= XML_SCHEMAS_TYPE_WHITESPACE_COLLAPSE;
                    break;
                default:
                    return (-1);
                }
                return (0);
            }
        }
    }
    /*
    * For all ·atomic· datatypes other than string (and types ·derived· 
    * by ·restriction· from it) the value of whiteSpace is fixed to 
    * collapse
    */
    {
        xmlSchemaTypePtr anc;

        for (anc = type->baseType; anc != NULL && 
                anc->builtInType != XML_SCHEMAS_ANYTYPE;
                anc = anc->baseType) {

            if (anc->type == XML_SCHEMA_TYPE_BASIC) {
                if (anc->builtInType == XML_SCHEMAS_NORMSTRING) {           
                    type->flags |= XML_SCHEMAS_TYPE_WHITESPACE_REPLACE;

                } else if ((anc->builtInType == XML_SCHEMAS_STRING) ||
                    (anc->builtInType == XML_SCHEMAS_ANYSIMPLETYPE)) {              
                    type->flags |= XML_SCHEMAS_TYPE_WHITESPACE_PRESERVE;

                } else
                    type->flags |= XML_SCHEMAS_TYPE_WHITESPACE_COLLAPSE;
                break;
            }
        }
    }
    return (0);
}

static int
xmlSchemaFixupSimpleTypeStageOne(xmlSchemaParserCtxtPtr pctxt,
                          xmlSchemaTypePtr type)
{
    if (type->type != XML_SCHEMA_TYPE_SIMPLE)
        return(0);
    if (! WXS_IS_TYPE_NOT_FIXED_1(type))
        return(0);
    type->flags |= XML_SCHEMAS_TYPE_FIXUP_1;

    if (WXS_IS_LIST(type)) {
        /*
        * Corresponds to <simpleType><list>...
        */
        if (type->subtypes == NULL) {
            /*
            * This one is really needed, so get out.
            */
            PERROR_INT("xmlSchemaFixupSimpleTypeStageOne",
                "list type has no item-type assigned");
            return(-1);
        }
    } else if (WXS_IS_UNION(type)) {
        /*
        * Corresponds to <simpleType><union>...
        */      
        if (type->memberTypes == NULL) {
            /*
            * This one is really needed, so get out.
            */
            PERROR_INT("xmlSchemaFixupSimpleTypeStageOne",
                "union type has no member-types assigned");
            return(-1);
        }           
    } else {    
        /*
        * Corresponds to <simpleType><restriction>...
        */
        if (type->baseType == NULL) {
            PERROR_INT("xmlSchemaFixupSimpleTypeStageOne",
                "type has no base-type assigned");
            return(-1);
        }
        if (WXS_IS_TYPE_NOT_FIXED_1(type->baseType))
            if (xmlSchemaFixupSimpleTypeStageOne(pctxt, type->baseType) == -1)
                return(-1);
        /*
        * Variety
        * If the <restriction> alternative is chosen, then the
        * {variety} of the {base type definition}.
        */
        if (WXS_IS_ATOMIC(type->baseType))
            type->flags |= XML_SCHEMAS_TYPE_VARIETY_ATOMIC;
        else if (WXS_IS_LIST(type->baseType)) {
            type->flags |= XML_SCHEMAS_TYPE_VARIETY_LIST;
            /*
            * Inherit the itemType.
            */
            type->subtypes = type->baseType->subtypes;
        } else if (WXS_IS_UNION(type->baseType)) {
            type->flags |= XML_SCHEMAS_TYPE_VARIETY_UNION;
            /*
            * NOTE that we won't assign the memberTypes of the base,
            * since this will make trouble when freeing them; we will
            * use a lookup function to access them instead.
            */
        }
    }
    return(0);
}

#ifdef DEBUG_TYPE
static void
xmlSchemaDebugFixedType(xmlSchemaParserCtxtPtr pctxt,
                       xmlSchemaTypePtr type)
{
    if (type->node != NULL) {
        xmlGenericError(xmlGenericErrorContext,
                        "Type of %s : %s:%d :", name,
                        type->node->doc->URL,
                        xmlGetLineNo(type->node));
    } else {
        xmlGenericError(xmlGenericErrorContext, "Type of %s :", name);
    }
    if ((WXS_IS_SIMPLE(type)) || (WXS_IS_COMPLEX(type))) {
        switch (type->contentType) {
            case XML_SCHEMA_CONTENT_SIMPLE:
                xmlGenericError(xmlGenericErrorContext, "simple\n");
                break;
            case XML_SCHEMA_CONTENT_ELEMENTS:
                xmlGenericError(xmlGenericErrorContext, "elements\n");
                break;
            case XML_SCHEMA_CONTENT_UNKNOWN:
                xmlGenericError(xmlGenericErrorContext, "unknown !!!\n");
                break;
            case XML_SCHEMA_CONTENT_EMPTY:
                xmlGenericError(xmlGenericErrorContext, "empty\n");
                break;
            case XML_SCHEMA_CONTENT_MIXED:
                if (xmlSchemaIsParticleEmptiable((xmlSchemaParticlePtr)
                    type->subtypes))
                    xmlGenericError(xmlGenericErrorContext,
                        "mixed as emptiable particle\n");
                else
                    xmlGenericError(xmlGenericErrorContext, "mixed\n");
                break;
                /* Removed, since not used. */
                /*
                case XML_SCHEMA_CONTENT_MIXED_OR_ELEMENTS:
                xmlGenericError(xmlGenericErrorContext, "mixed or elems\n");
                break;
                */
            case XML_SCHEMA_CONTENT_BASIC:
                xmlGenericError(xmlGenericErrorContext, "basic\n");
                break;
            default:
                xmlGenericError(xmlGenericErrorContext,
                    "not registered !!!\n");
                break;
        }
    }
}
#endif

/*
* 3.14.6 Constraints on Simple Type Definition Schema Components
*/
static int
xmlSchemaFixupSimpleTypeStageTwo(xmlSchemaParserCtxtPtr pctxt,
                                 xmlSchemaTypePtr type)
{
    int res, olderrs = pctxt->nberrors;

    if (type->type != XML_SCHEMA_TYPE_SIMPLE)
        return(-1);

    if (! WXS_IS_TYPE_NOT_FIXED(type))
        return(0);

    type->flags |= XML_SCHEMAS_TYPE_INTERNAL_RESOLVED;
    type->contentType = XML_SCHEMA_CONTENT_SIMPLE;

    if (type->baseType == NULL) {
        PERROR_INT("xmlSchemaFixupSimpleTypeStageTwo",
            "missing baseType");
        goto exit_failure;
    }
    if (WXS_IS_TYPE_NOT_FIXED(type->baseType))
        xmlSchemaTypeFixup(type->baseType, ACTXT_CAST pctxt);
    /* 
    * If a member type of a union is a union itself, we need to substitute
    * that member type for its member types.
    * NOTE that this might change in WXS 1.1; i.e. we will keep the union
    * types in WXS 1.1.
    */
    if ((type->memberTypes != NULL) &&
        (xmlSchemaFinishMemberTypeDefinitionsProperty(pctxt, type) == -1))
        return(-1);        
    /*
    * SPEC src-simple-type 1 
    * "The corresponding simple type definition, if any, must satisfy
    * the conditions set out in Constraints on Simple Type Definition
    * Schema Components (§3.14.6)."
    */
    /*
    * Schema Component Constraint: Simple Type Definition Properties Correct
    * (st-props-correct)
    */
    res = xmlSchemaCheckSTPropsCorrect(pctxt, type);
    HFAILURE HERROR
    /* 
    * Schema Component Constraint: Derivation Valid (Restriction, Simple)
    * (cos-st-restricts)
    */
    res = xmlSchemaCheckCOSSTRestricts(pctxt, type);
    HFAILURE HERROR
    /*
    * TODO: Removed the error report, since it got annoying to get an
    * extra error report, if anything failed until now.
    * Enable this if needed.
    *
    * xmlSchemaPErr(ctxt, type->node,
    *    XML_SCHEMAP_SRC_SIMPLE_TYPE_1,
    *    "Simple type '%s' does not satisfy the constraints "
    *    "on simple type definitions.\n",
    *    type->name, NULL);
    */
    /*
    * Schema Component Constraint: Simple Type Restriction (Facets)
    * (st-restrict-facets)
    */
    res = xmlSchemaCheckFacetValues(type, pctxt);
    HFAILURE HERROR
    if ((type->facetSet != NULL) ||
        (type->baseType->facetSet != NULL)) {
        res = xmlSchemaDeriveAndValidateFacets(pctxt, type);
        HFAILURE HERROR
    }
    /*
    * Whitespace value.
    */
    res = xmlSchemaTypeFixupWhitespace(type);
    HFAILURE HERROR
    xmlSchemaTypeFixupOptimFacets(type);    

exit_error:
#ifdef DEBUG_TYPE
    xmlSchemaDebugFixedType(pctxt, type);
#endif
    if (olderrs != pctxt->nberrors)
        return(pctxt->err);
    return(0);

exit_failure:
#ifdef DEBUG_TYPE
    xmlSchemaDebugFixedType(pctxt, type);
#endif
    return(-1);
}

static int
xmlSchemaFixupComplexType(xmlSchemaParserCtxtPtr pctxt,
                          xmlSchemaTypePtr type)
{
    int res = 0, olderrs = pctxt->nberrors;
    xmlSchemaTypePtr baseType = type->baseType;

    if (! WXS_IS_TYPE_NOT_FIXED(type))
        return(0);
    type->flags |= XML_SCHEMAS_TYPE_INTERNAL_RESOLVED;
    if (baseType == NULL) {
        PERROR_INT("xmlSchemaFixupComplexType",
            "missing baseType");
        goto exit_failure;
    }    
    /*
    * Fixup the base type.
    */
    if (WXS_IS_TYPE_NOT_FIXED(baseType))
        xmlSchemaTypeFixup(baseType, ACTXT_CAST pctxt);
    if (baseType->flags & XML_SCHEMAS_TYPE_INTERNAL_INVALID) {
        /*
        * Skip fixup if the base type is invalid.
        * TODO: Generate a warning!
        */
        return(0);
    }   
    /*
    * This basically checks if the base type can be derived.
    */
    res = xmlSchemaCheckSRCCT(pctxt, type);
    HFAILURE HERROR   
    /*
    * Fixup the content type.
    */
    if (type->contentType == XML_SCHEMA_CONTENT_SIMPLE) {
        /*
        * Corresponds to <complexType><simpleContent>...
        */
        if ((WXS_IS_COMPLEX(baseType)) &&
            (baseType->contentTypeDef != NULL) &&
            (WXS_IS_RESTRICTION(type))) {
            xmlSchemaTypePtr contentBase, content;
#ifdef ENABLE_NAMED_LOCALS
            char buf[30];
            const xmlChar *tmpname;
#endif
            /*
            * SPEC (1) If <restriction> + base type is <complexType>,
            * "whose own {content type} is a simple type..."
            */
            if (type->contentTypeDef != NULL) {
                /*
                * SPEC (1.1) "the simple type definition corresponding to the
                * <simpleType> among the [children] of <restriction> if there
                * is one;"
                * Note that this "<simpleType> among the [children]" was put
                * into ->contentTypeDef during parsing.
                */
                contentBase = type->contentTypeDef;
                type->contentTypeDef = NULL;
            } else {
                /*
                * (1.2) "...otherwise (<restriction> has no <simpleType>
                * among its [children]), the simple type definition which
                * is the {content type} of the ... base type."
                */
                contentBase = baseType->contentTypeDef;
            }
            /*
            * SPEC
            * "... a simple type definition which restricts the simple
            * type definition identified in clause 1.1 or clause 1.2
            * with a set of facet components"
            *
            * Create the anonymous simple type, which will be the content
            * type of the complex type.
            */
#ifdef ENABLE_NAMED_LOCALS
            snprintf(buf, 29, "#scST%d", ++(pctxt->counter));
            tmpname = xmlDictLookup(pctxt->dict, BAD_CAST buf, -1);
            content = xmlSchemaAddType(pctxt, pctxt->schema,
                XML_SCHEMA_TYPE_SIMPLE, tmpname, type->targetNamespace,
                type->node, 0);
#else
            content = xmlSchemaAddType(pctxt, pctxt->schema,
                XML_SCHEMA_TYPE_SIMPLE, NULL, type->targetNamespace,
                type->node, 0);
#endif
            if (content == NULL)
                goto exit_failure;
            /*
            * We will use the same node as for the <complexType>
            * to have it somehow anchored in the schema doc.
            */
            content->type = XML_SCHEMA_TYPE_SIMPLE;
            content->baseType = contentBase;
            /*
            * Move the facets, previously anchored on the
            * complexType during parsing.
            */
            content->facets = type->facets;
            type->facets = NULL;
            content->facetSet = type->facetSet;
            type->facetSet = NULL;
            
            type->contentTypeDef = content;
            if (WXS_IS_TYPE_NOT_FIXED(contentBase))
                xmlSchemaTypeFixup(contentBase, ACTXT_CAST pctxt);
            /*
            * Fixup the newly created type. We don't need to check
            * for circularity here.
            */
            res = xmlSchemaFixupSimpleTypeStageOne(pctxt, content);
            HFAILURE HERROR 
            res = xmlSchemaFixupSimpleTypeStageTwo(pctxt, content);
            HFAILURE HERROR 
                
        } else if ((WXS_IS_COMPLEX(baseType)) &&
            (baseType->contentType == XML_SCHEMA_CONTENT_MIXED) &&
            (WXS_IS_RESTRICTION(type))) {
            /*
            * SPEC (2) If <restriction> + base is a mixed <complexType> with
            * an emptiable particle, then a simple type definition which
            * restricts the <restriction>'s <simpleType> child.
            */
            if ((type->contentTypeDef == NULL) ||
                (type->contentTypeDef->baseType == NULL)) {
                /*
                * TODO: Check if this ever happens.
                */
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_INTERNAL,
                    WXS_BASIC_CAST type, NULL,
                    "Internal error: xmlSchemaTypeFixup, "
                    "complex type '%s': the <simpleContent><restriction> "
                    "is missing a <simpleType> child, but was not catched "
                    "by xmlSchemaCheckSRCCT()", type->name);
                goto exit_failure;
            }
        } else if ((WXS_IS_COMPLEX(baseType)) && WXS_IS_EXTENSION(type)) {
            /*
            * SPEC (3) If <extension> + base is <complexType> with
            * <simpleType> content, "...then the {content type} of that
            * complex type definition"
            */
            if (baseType->contentTypeDef == NULL) {
                /*
                * TODO: Check if this ever happens. xmlSchemaCheckSRCCT
                * should have catched this already.
                */
                xmlSchemaPCustomErr(pctxt,
                    XML_SCHEMAP_INTERNAL,
                    WXS_BASIC_CAST type, NULL,
                    "Internal error: xmlSchemaTypeFixup, "
                    "complex type '%s': the <extension>ed base type is "
                    "a complex type with no simple content type",
                    type->name);
                goto exit_failure;
            }
            type->contentTypeDef = baseType->contentTypeDef;
        } else if ((WXS_IS_SIMPLE(baseType)) && WXS_IS_EXTENSION(type)) {
            /*
            * SPEC (4) <extension> + base is <simpleType>
            * "... then that simple type definition"
            */
            type->contentTypeDef = baseType;
        } else {
            /*
            * TODO: Check if this ever happens.
            */
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_INTERNAL,
                WXS_BASIC_CAST type, NULL,
                "Internal error: xmlSchemaTypeFixup, "
                "complex type '%s' with <simpleContent>: unhandled "
                "derivation case", type->name);
            goto exit_failure;
        }
    } else {
        int dummySequence = 0;
        xmlSchemaParticlePtr particle =
            (xmlSchemaParticlePtr) type->subtypes;
        /*
        * Corresponds to <complexType><complexContent>...
        *
        * NOTE that the effective mixed was already set during parsing of
        * <complexType> and <complexContent>; its flag value is
        * XML_SCHEMAS_TYPE_MIXED.
        *
        * Compute the "effective content":
        * (2.1.1) + (2.1.2) + (2.1.3)
        */
        if ((particle == NULL) ||
            ((particle->type == XML_SCHEMA_TYPE_PARTICLE) &&
            ((particle->children->type == XML_SCHEMA_TYPE_ALL) ||
            (particle->children->type == XML_SCHEMA_TYPE_SEQUENCE) ||
            ((particle->children->type == XML_SCHEMA_TYPE_CHOICE) &&
            (particle->minOccurs == 0))) &&
            ( ((xmlSchemaTreeItemPtr) particle->children)->children == NULL))) {
            if (type->flags & XML_SCHEMAS_TYPE_MIXED) {
                /*
                * SPEC (2.1.4) "If the ·effective mixed· is true, then
                * a particle whose properties are as follows:..."
                *
                * Empty sequence model group with
                * minOccurs/maxOccurs = 1 (i.e. a "particle emptiable").
                * NOTE that we sill assign it the <complexType> node to
                * somehow anchor it in the doc.
                */
                if ((particle == NULL) ||
                    (particle->children->type != XML_SCHEMA_TYPE_SEQUENCE)) {
                    /*
                    * Create the particle.
                    */
                    particle = xmlSchemaAddParticle(pctxt,
                        type->node, 1, 1);
                    if (particle == NULL)
                        goto exit_failure;
                    /*
                    * Create the model group.
                    */ /* URGENT TODO: avoid adding to pending items. */
                    particle->children = (xmlSchemaTreeItemPtr)
                        xmlSchemaAddModelGroup(pctxt, pctxt->schema,
                        XML_SCHEMA_TYPE_SEQUENCE, type->node);
                    if (particle->children == NULL)
                        goto exit_failure;
                    
                    type->subtypes = (xmlSchemaTypePtr) particle;
                }
                dummySequence = 1;
                type->contentType = XML_SCHEMA_CONTENT_ELEMENTS;
            } else {
                /*
                * SPEC (2.1.5) "otherwise empty"
                */
                type->contentType = XML_SCHEMA_CONTENT_EMPTY;
            }
        } else {
            /*
            * SPEC (2.2) "otherwise the particle corresponding to the
            * <all>, <choice>, <group> or <sequence> among the
            * [children]."
            */
            type->contentType = XML_SCHEMA_CONTENT_ELEMENTS;
        }
        /*
        * Compute the "content type".
        */
        if (WXS_IS_RESTRICTION(type)) {
            /*
            * SPEC (3.1) "If <restriction>..."
            * (3.1.1) + (3.1.2) */
            if (type->contentType != XML_SCHEMA_CONTENT_EMPTY) {
                if (type->flags & XML_SCHEMAS_TYPE_MIXED)
                    type->contentType = XML_SCHEMA_CONTENT_MIXED;
            }
        } else {
            /*
            * SPEC (3.2) "If <extension>..."
            */
            if (type->contentType == XML_SCHEMA_CONTENT_EMPTY) {
                /*
                * SPEC (3.2.1)
                * "If the ·effective content· is empty, then the
                *  {content type} of the [...] base ..."
                */
                type->contentType = baseType->contentType;
                type->subtypes = baseType->subtypes;
                /*
                * Fixes bug #347316:
                * This is the case when the base type has a simple
                * type definition as content.
                */
                type->contentTypeDef = baseType->contentTypeDef;
                /*
                * NOTE that the effective mixed is ignored here.
                */
            } else if (baseType->contentType == XML_SCHEMA_CONTENT_EMPTY) {
                /*
                * SPEC (3.2.2)
                */
                if (type->flags & XML_SCHEMAS_TYPE_MIXED)
                    type->contentType = XML_SCHEMA_CONTENT_MIXED;
            } else {
                /*
                * SPEC (3.2.3)
                */
                if (type->flags & XML_SCHEMAS_TYPE_MIXED)
                    type->contentType = XML_SCHEMA_CONTENT_MIXED;
                    /*
                    * "A model group whose {compositor} is sequence and whose
                    * {particles} are..."
                    */
                if ((WXS_TYPE_PARTICLE(type) != NULL) &&
                    (WXS_TYPE_PARTICLE_TERM(type) != NULL) &&
                    ((WXS_TYPE_PARTICLE_TERM(type))->type ==
                        XML_SCHEMA_TYPE_ALL))
                {
                    /*
                    * SPEC cos-all-limited (1)
                    */
                    xmlSchemaCustomErr(ACTXT_CAST pctxt,
                        /* TODO: error code */
                        XML_SCHEMAP_COS_ALL_LIMITED,
                        WXS_ITEM_NODE(type), NULL,
                        "The type has an 'all' model group in its "
                        "{content type} and thus cannot be derived from "
                        "a non-empty type, since this would produce a "
                        "'sequence' model group containing the 'all' "
                        "model group; 'all' model groups are not "
                        "allowed to appear inside other model groups",
                        NULL, NULL);

                } else if ((WXS_TYPE_PARTICLE(baseType) != NULL) &&
                    (WXS_TYPE_PARTICLE_TERM(baseType) != NULL) &&
                    ((WXS_TYPE_PARTICLE_TERM(baseType))->type ==
                        XML_SCHEMA_TYPE_ALL))
                {
                    /*
                    * SPEC cos-all-limited (1)
                    */
                    xmlSchemaCustomErr(ACTXT_CAST pctxt,
                        /* TODO: error code */
                        XML_SCHEMAP_COS_ALL_LIMITED,
                        WXS_ITEM_NODE(type), NULL,
                        "A type cannot be derived by extension from a type "
                        "which has an 'all' model group in its "
                        "{content type}, since this would produce a "
                        "'sequence' model group containing the 'all' "
                        "model group; 'all' model groups are not "
                        "allowed to appear inside other model groups",
                        NULL, NULL);

                } else if (! dummySequence) {
                    xmlSchemaTreeItemPtr effectiveContent =
                        (xmlSchemaTreeItemPtr) type->subtypes;
                    /*
                    * Create the particle.
                    */
                    particle = xmlSchemaAddParticle(pctxt,
                        type->node, 1, 1);
                    if (particle == NULL)
                        goto exit_failure;
                    /*
                    * Create the "sequence" model group.
                    */
                    particle->children = (xmlSchemaTreeItemPtr)
                        xmlSchemaAddModelGroup(pctxt, pctxt->schema,
                        XML_SCHEMA_TYPE_SEQUENCE, type->node);
                    if (particle->children == NULL)
                        goto exit_failure;
                    WXS_TYPE_CONTENTTYPE(type) = (xmlSchemaTypePtr) particle;
                    /*
                    * SPEC "the particle of the {content type} of
                    * the ... base ..."
                    * Create a duplicate of the base type's particle
                    * and assign its "term" to it.
                    */
                    particle->children->children =
                        (xmlSchemaTreeItemPtr) xmlSchemaAddParticle(pctxt,
                        type->node,
                        ((xmlSchemaParticlePtr) type->subtypes)->minOccurs,
                        ((xmlSchemaParticlePtr) type->subtypes)->maxOccurs);
                    if (particle->children->children == NULL)
                        goto exit_failure;
                    particle = (xmlSchemaParticlePtr)
                        particle->children->children;
                    particle->children =
                        ((xmlSchemaParticlePtr) baseType->subtypes)->children;
                    /*
                    * SPEC "followed by the ·effective content·."
                    */
                    particle->next = effectiveContent;
                    /*
                    * This all will result in:
                    * new-particle
                    *   --> new-sequence(
                    *         new-particle
                    *           --> base-model,
                    *         this-particle
                    *           --> this-model
                    *       )
                    */
                } else {
                    /*
                    * This is the case when there is already an empty
                    * <sequence> with minOccurs==maxOccurs==1.
                    * Just add the base types's content type.
                    * NOTE that, although we miss to add an intermediate
                    * <sequence>, this should produce no difference to
                    * neither the regex compilation of the content model,
                    * nor to the complex type constraints.
                    */
                    particle->children->children =
                        (xmlSchemaTreeItemPtr) baseType->subtypes;
                }
            }
        }
    }
    /*
    * Now fixup attribute uses:
    *   - expand attr. group references
    *     - intersect attribute wildcards
    *   - inherit attribute uses of the base type
    *   - inherit or union attr. wildcards if extending
    *   - apply attr. use prohibitions if restricting
    */
    res = xmlSchemaFixupTypeAttributeUses(pctxt, type);
    HFAILURE HERROR
    /*
    * Apply the complex type component constraints; this will not
    * check attributes, since this is done in
    * xmlSchemaFixupTypeAttributeUses().
    */
    res = xmlSchemaCheckCTComponent(pctxt, type);
    HFAILURE HERROR

#ifdef DEBUG_TYPE
    xmlSchemaDebugFixedType(pctxt, type);
#endif
    if (olderrs != pctxt->nberrors)
        return(pctxt->err);
    else
        return(0);

exit_error:
    type->flags |= XML_SCHEMAS_TYPE_INTERNAL_INVALID;
#ifdef DEBUG_TYPE
    xmlSchemaDebugFixedType(pctxt, type);
#endif
    return(pctxt->err);

exit_failure:
    type->flags |= XML_SCHEMAS_TYPE_INTERNAL_INVALID;
#ifdef DEBUG_TYPE
    xmlSchemaDebugFixedType(pctxt, type);
#endif
    return(-1);
}


/**
 * xmlSchemaTypeFixup:
 * @typeDecl:  the schema type definition
 * @ctxt:  the schema parser context
 *
 * Fixes the content model of the type.
 * URGENT TODO: We need an int result!
 */
static int
xmlSchemaTypeFixup(xmlSchemaTypePtr type,
                   xmlSchemaAbstractCtxtPtr actxt)
{
    if (type == NULL)
        return(0);
    if (actxt->type != XML_SCHEMA_CTXT_PARSER) {
        AERROR_INT("xmlSchemaTypeFixup",
            "this function needs a parser context");
        return(-1);
    }
    if (! WXS_IS_TYPE_NOT_FIXED(type))
        return(0);
    if (type->type == XML_SCHEMA_TYPE_COMPLEX)
        return(xmlSchemaFixupComplexType(PCTXT_CAST actxt, type));
    else if (type->type == XML_SCHEMA_TYPE_SIMPLE)
        return(xmlSchemaFixupSimpleTypeStageTwo(PCTXT_CAST actxt, type));
    return(0);
}

/**
 * xmlSchemaCheckFacet:
 * @facet:  the facet
 * @typeDecl:  the schema type definition
 * @pctxt:  the schema parser context or NULL
 * @name: the optional name of the type
 *
 * Checks and computes the values of facets.
 *
 * Returns 0 if valid, a positive error code if not valid and
 *         -1 in case of an internal or API error.
 */
int
xmlSchemaCheckFacet(xmlSchemaFacetPtr facet,
                    xmlSchemaTypePtr typeDecl,
                    xmlSchemaParserCtxtPtr pctxt,
                    const xmlChar * name ATTRIBUTE_UNUSED)
{
    int ret = 0, ctxtGiven;

    if ((facet == NULL) || (typeDecl == NULL))
        return(-1);
    /*
    * TODO: will the parser context be given if used from
    * the relaxNG module?
    */
    if (pctxt == NULL)
        ctxtGiven = 0;
    else
        ctxtGiven = 1;

    switch (facet->type) {
        case XML_SCHEMA_FACET_MININCLUSIVE:
        case XML_SCHEMA_FACET_MINEXCLUSIVE:
        case XML_SCHEMA_FACET_MAXINCLUSIVE:
        case XML_SCHEMA_FACET_MAXEXCLUSIVE:
        case XML_SCHEMA_FACET_ENUMERATION: {
                /*
                 * Okay we need to validate the value
                 * at that point.
                 */
                xmlSchemaTypePtr base;

                /* 4.3.5.5 Constraints on enumeration Schema Components
                * Schema Component Constraint: enumeration valid restriction
                * It is an ·error· if any member of {value} is not in the
                * ·value space· of {base type definition}.
                *
                * minInclusive, maxInclusive, minExclusive, maxExclusive:
                * The value ·must· be in the
                * ·value space· of the ·base type·.
                */
                /*
                * This function is intended to deliver a compiled value
                * on the facet. In this implementation of XML Schemata the
                * type holding a facet, won't be a built-in type.
                * Thus to ensure that other API
                * calls (relaxng) do work, if the given type is a built-in
                * type, we will assume that the given built-in type *is
                * already* the base type.
                */
                if (typeDecl->type != XML_SCHEMA_TYPE_BASIC) {
                    base = typeDecl->baseType;
                    if (base == NULL) {
                        PERROR_INT("xmlSchemaCheckFacet",
                            "a type user derived type has no base type");
                        return (-1);
                    }
                } else
                    base = typeDecl;
                         
                if (! ctxtGiven) {
                    /*
                    * A context is needed if called from RelaxNG.
                    */              
                    pctxt = xmlSchemaNewParserCtxt("*");
                    if (pctxt == NULL)
                        return (-1);
                }
                /*
                * NOTE: This call does not check the content nodes,
                * since they are not available:
                * facet->node is just the node holding the facet
                * definition, *not* the attribute holding the *value*
                * of the facet.
                */              
                ret = xmlSchemaVCheckCVCSimpleType(
                    ACTXT_CAST pctxt, facet->node, base,
                    facet->value, &(facet->val), 1, 1, 0);
                if (ret != 0) {
                    if (ret < 0) {
                        /* No error message for RelaxNG. */
                        if (ctxtGiven) {                            
                            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                                XML_SCHEMAP_INTERNAL, facet->node, NULL,
                                "Internal error: xmlSchemaCheckFacet, " 
                                "failed to validate the value '%s' of the "
                                "facet '%s' against the base type",
                                facet->value, xmlSchemaFacetTypeToString(facet->type));
                        }
                        goto internal_error;
                    }
                    ret = XML_SCHEMAP_INVALID_FACET_VALUE;
                    /* No error message for RelaxNG. */
                    if (ctxtGiven) {
                        xmlChar *str = NULL;

                        xmlSchemaCustomErr(ACTXT_CAST pctxt,
                            ret, facet->node, WXS_BASIC_CAST facet,
                            "The value '%s' of the facet does not validate "
                            "against the base type '%s'",
                            facet->value,
                            xmlSchemaFormatQName(&str,
                                base->targetNamespace, base->name));
                        FREE_AND_NULL(str);
                    }
                    goto exit;
                } else if (facet->val == NULL) {
                    if (ctxtGiven) {
                        PERROR_INT("xmlSchemaCheckFacet",
                            "value was not computed");
                    }
                    TODO
                }
                break;
            }
        case XML_SCHEMA_FACET_PATTERN:
            facet->regexp = xmlRegexpCompile(facet->value);
            if (facet->regexp == NULL) {
                ret = XML_SCHEMAP_REGEXP_INVALID;
                /* No error message for RelaxNG. */
                if (ctxtGiven) {
                    xmlSchemaCustomErr(ACTXT_CAST pctxt,
                        ret, facet->node, WXS_BASIC_CAST typeDecl,
                        "The value '%s' of the facet 'pattern' is not a "
                        "valid regular expression",
                        facet->value, NULL);
                }
            }
            break;
        case XML_SCHEMA_FACET_TOTALDIGITS:
        case XML_SCHEMA_FACET_FRACTIONDIGITS:
        case XML_SCHEMA_FACET_LENGTH:
        case XML_SCHEMA_FACET_MAXLENGTH:
        case XML_SCHEMA_FACET_MINLENGTH:

            if (facet->type == XML_SCHEMA_FACET_TOTALDIGITS) {
                ret = xmlSchemaValidatePredefinedType(
                    xmlSchemaGetBuiltInType(XML_SCHEMAS_PINTEGER),
                    facet->value, &(facet->val));
            } else {
                ret = xmlSchemaValidatePredefinedType(
                    xmlSchemaGetBuiltInType(XML_SCHEMAS_NNINTEGER),
                    facet->value, &(facet->val));
            }
            if (ret != 0) {
                if (ret < 0) {
                    /* No error message for RelaxNG. */
                    if (ctxtGiven) {
                        PERROR_INT("xmlSchemaCheckFacet",
                            "validating facet value");
                    }
                    goto internal_error;
                }
                ret = XML_SCHEMAP_INVALID_FACET_VALUE;
                /* No error message for RelaxNG. */
                if (ctxtGiven) {
                    /* error code */
                    xmlSchemaCustomErr4(ACTXT_CAST pctxt,
                        ret, facet->node, WXS_BASIC_CAST typeDecl,
                        "The value '%s' of the facet '%s' is not a valid '%s'",                 
                        facet->value,
                        xmlSchemaFacetTypeToString(facet->type),
                        (facet->type != XML_SCHEMA_FACET_TOTALDIGITS) ? 
                            BAD_CAST "nonNegativeInteger" :
                            BAD_CAST "positiveInteger",
                        NULL);
                }
            }
            break;
            
        case XML_SCHEMA_FACET_WHITESPACE:{
                if (xmlStrEqual(facet->value, BAD_CAST "preserve")) {
                    facet->whitespace = XML_SCHEMAS_FACET_PRESERVE;
                } else if (xmlStrEqual(facet->value, BAD_CAST "replace")) {
                    facet->whitespace = XML_SCHEMAS_FACET_REPLACE;
                } else if (xmlStrEqual(facet->value, BAD_CAST "collapse")) {
                    facet->whitespace = XML_SCHEMAS_FACET_COLLAPSE;
                } else {
                    ret = XML_SCHEMAP_INVALID_FACET_VALUE;
                    /* No error message for RelaxNG. */
                    if (ctxtGiven) {
                        /* error was previously: XML_SCHEMAP_INVALID_WHITE_SPACE */
                        xmlSchemaCustomErr(ACTXT_CAST pctxt,
                            ret, facet->node, WXS_BASIC_CAST typeDecl,
                            "The value '%s' of the facet 'whitespace' is not "
                            "valid", facet->value, NULL);
                    }
                }
            }
        default:
            break;
    }
exit:
    if ((! ctxtGiven) && (pctxt != NULL))
        xmlSchemaFreeParserCtxt(pctxt);
    return (ret);
internal_error:
    if ((! ctxtGiven) && (pctxt != NULL))
        xmlSchemaFreeParserCtxt(pctxt);
    return (-1);
}

/**
 * xmlSchemaCheckFacetValues:
 * @typeDecl:  the schema type definition
 * @ctxt:  the schema parser context
 *
 * Checks the default values types, especially for facets
 */
static int
xmlSchemaCheckFacetValues(xmlSchemaTypePtr typeDecl,
                          xmlSchemaParserCtxtPtr pctxt)
{
    int res, olderrs = pctxt->nberrors;
    const xmlChar *name = typeDecl->name;
    /*
    * NOTE: It is intended to use the facets list, instead
    * of facetSet.
    */
    if (typeDecl->facets != NULL) {
        xmlSchemaFacetPtr facet = typeDecl->facets;

        /*
        * Temporarily assign the "schema" to the validation context
        * of the parser context. This is needed for NOTATION validation.
        */
        if (pctxt->vctxt == NULL) {
            if (xmlSchemaCreateVCtxtOnPCtxt(pctxt) == -1)
                return(-1);
        }
        pctxt->vctxt->schema = pctxt->schema;
        while (facet != NULL) {
            res = xmlSchemaCheckFacet(facet, typeDecl, pctxt, name);
            HFAILURE
            facet = facet->next;
        }
        pctxt->vctxt->schema = NULL;
    }
    if (olderrs != pctxt->nberrors)
        return(pctxt->err);
    return(0);
exit_failure:
    return(-1);
}

/**
 * xmlSchemaGetCircModelGrDefRef:
 * @ctxtMGroup: the searched model group
 * @selfMGroup: the second searched model group
 * @particle: the first particle
 *
 * This one is intended to be used by
 * xmlSchemaCheckGroupDefCircular only.
 *
 * Returns the particle with the circular model group definition reference,
 * otherwise NULL.
 */
static xmlSchemaTreeItemPtr
xmlSchemaGetCircModelGrDefRef(xmlSchemaModelGroupDefPtr groupDef,
                              xmlSchemaTreeItemPtr particle)
{
    xmlSchemaTreeItemPtr circ = NULL;
    xmlSchemaTreeItemPtr term;
    xmlSchemaModelGroupDefPtr gdef;

    for (; particle != NULL; particle = particle->next) {
        term = particle->children;
        if (term == NULL)
            continue;
        switch (term->type) {
            case XML_SCHEMA_TYPE_GROUP:
                gdef = (xmlSchemaModelGroupDefPtr) term;
                if (gdef == groupDef)
                    return (particle);
                /*
                * Mark this model group definition to avoid infinite
                * recursion on circular references not yet examined.
                */
                if (gdef->flags & XML_SCHEMA_MODEL_GROUP_DEF_MARKED)
                    continue;
                if (gdef->children != NULL) {
                    gdef->flags |= XML_SCHEMA_MODEL_GROUP_DEF_MARKED;
                    circ = xmlSchemaGetCircModelGrDefRef(groupDef,
                        gdef->children->children);
                    gdef->flags ^= XML_SCHEMA_MODEL_GROUP_DEF_MARKED;
                    if (circ != NULL)
                        return (circ);
                }
                break;
            case XML_SCHEMA_TYPE_SEQUENCE:
            case XML_SCHEMA_TYPE_CHOICE:
            case XML_SCHEMA_TYPE_ALL:
                circ = xmlSchemaGetCircModelGrDefRef(groupDef, term->children);
                if (circ != NULL)
                    return (circ);
                break;
            default:
                break;
        }
    }
    return (NULL);
}

/**
 * xmlSchemaCheckGroupDefCircular:
 * @item:  the model group definition
 * @ctxt:  the parser context
 * @name:  the name
 *
 * Checks for circular references to model group definitions.
 */
static void
xmlSchemaCheckGroupDefCircular(xmlSchemaModelGroupDefPtr item,
                               xmlSchemaParserCtxtPtr ctxt)
{
    /*
    * Schema Component Constraint: Model Group Correct
    * 2 Circular groups are disallowed. That is, within the {particles}
    * of a group there must not be at any depth a particle whose {term}
    * is the group itself.
    */
    if ((item == NULL) ||
        (item->type != XML_SCHEMA_TYPE_GROUP) ||
        (item->children == NULL))
        return;
    {
        xmlSchemaTreeItemPtr circ;

        circ = xmlSchemaGetCircModelGrDefRef(item, item->children->children);
        if (circ != NULL) {
            xmlChar *str = NULL;
            /*
            * TODO: The error report is not adequate: this constraint
            * is defined for model groups but not definitions, but since
            * there cannot be any circular model groups without a model group
            * definition (if not using a construction API), we check those
            * defintions only.
            */
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_MG_PROPS_CORRECT_2,
                NULL, WXS_ITEM_NODE(circ),
                "Circular reference to the model group definition '%s' "
                "defined", xmlSchemaFormatQName(&str,
                    item->targetNamespace, item->name));
            FREE_AND_NULL(str)
            /*
            * NOTE: We will cut the reference to avoid further
            * confusion of the processor. This is a fatal error.
            */
            circ->children = NULL;
        }
    }
}

/**
 * xmlSchemaModelGroupToModelGroupDefFixup:
 * @ctxt:  the parser context
 * @mg:  the model group
 *
 * Assigns the model group of model group definitions to the "term"
 * of the referencing particle.
 * In xmlSchemaResolveModelGroupParticleReferences the model group
 * definitions were assigned to the "term", since needed for the
 * circularity check.
 *
 * Schema Component Constraint:
 *     All Group Limited (cos-all-limited) (1.2)
 */
static void
xmlSchemaModelGroupToModelGroupDefFixup(
    xmlSchemaParserCtxtPtr ctxt ATTRIBUTE_UNUSED,
    xmlSchemaModelGroupPtr mg)
{
    xmlSchemaParticlePtr particle = WXS_MODELGROUP_PARTICLE(mg);

    while (particle != NULL) {
        if ((WXS_PARTICLE_TERM(particle) == NULL) ||
            ((WXS_PARTICLE_TERM(particle))->type !=
                XML_SCHEMA_TYPE_GROUP))
        {
            particle = WXS_PTC_CAST particle->next;
            continue;
        } 
        if (WXS_MODELGROUPDEF_MODEL(WXS_PARTICLE_TERM(particle)) == NULL) {
            /*
            * TODO: Remove the particle.
            */
            WXS_PARTICLE_TERM(particle) = NULL;
            particle = WXS_PTC_CAST particle->next;
            continue;
        }
        /*
        * Assign the model group to the {term} of the particle.
        */
        WXS_PARTICLE_TERM(particle) =
            WXS_TREE_CAST WXS_MODELGROUPDEF_MODEL(WXS_PARTICLE_TERM(particle));

        particle = WXS_PTC_CAST particle->next;
    }
}

/**
 * xmlSchemaCheckAttrGroupCircularRecur:
 * @ctxtGr: the searched attribute group
 * @attr: the current attribute list to be processed
 *
 * This one is intended to be used by
 * xmlSchemaCheckAttrGroupCircular only.
 *
 * Returns the circular attribute grou reference, otherwise NULL.
 */
static xmlSchemaQNameRefPtr
xmlSchemaCheckAttrGroupCircularRecur(xmlSchemaAttributeGroupPtr ctxtGr,
                                     xmlSchemaItemListPtr list)
{
    xmlSchemaAttributeGroupPtr gr;
    xmlSchemaQNameRefPtr ref, circ;
    int i;
    /*
    * We will search for an attribute group reference which
    * references the context attribute group.
    */
    for (i = 0; i < list->nbItems; i++) {
        ref = list->items[i];
        if ((ref->type == XML_SCHEMA_EXTRA_QNAMEREF) &&
            (ref->itemType == XML_SCHEMA_TYPE_ATTRIBUTEGROUP) &&
            (ref->item != NULL))
        {
            gr = WXS_ATTR_GROUP_CAST ref->item;
            if (gr == ctxtGr)
                return(ref);
            if (gr->flags & XML_SCHEMAS_ATTRGROUP_MARKED)
                continue;           
            /*
            * Mark as visited to avoid infinite recursion on
            * circular references not yet examined.
            */
            if ((gr->attrUses) &&
                (gr->flags & XML_SCHEMAS_ATTRGROUP_HAS_REFS))
            {
                gr->flags |= XML_SCHEMAS_ATTRGROUP_MARKED;
                circ = xmlSchemaCheckAttrGroupCircularRecur(ctxtGr,
                    (xmlSchemaItemListPtr) gr->attrUses);               
                gr->flags ^= XML_SCHEMAS_ATTRGROUP_MARKED;
                if (circ != NULL)
                    return (circ);
            }
            
        }
    }
    return (NULL);
}

/**
 * xmlSchemaCheckAttrGroupCircular:
 * attrGr:  the attribute group definition
 * @ctxt:  the parser context
 * @name:  the name
 *
 * Checks for circular references of attribute groups.
 */
static int
xmlSchemaCheckAttrGroupCircular(xmlSchemaAttributeGroupPtr attrGr,
                                xmlSchemaParserCtxtPtr ctxt)
{
    /*
    * Schema Representation Constraint:
    * Attribute Group Definition Representation OK
    * 3 Circular group reference is disallowed outside <redefine>.
    * That is, unless this element information item's parent is
    * <redefine>, then among the [children], if any, there must
    * not be an <attributeGroup> with ref [attribute] which resolves
    * to the component corresponding to this <attributeGroup>. Indirect
    * circularity is also ruled out. That is, when QName resolution
    * (Schema Document) (§3.15.3) is applied to a ·QName· arising from
    * any <attributeGroup>s with a ref [attribute] among the [children],
    * it must not be the case that a ·QName· is encountered at any depth
    * which resolves to the component corresponding to this <attributeGroup>.
    */
    if (attrGr->attrUses == NULL)
        return(0);
    else if ((attrGr->flags & XML_SCHEMAS_ATTRGROUP_HAS_REFS) == 0)
        return(0);
    else {
        xmlSchemaQNameRefPtr circ;
        
        circ = xmlSchemaCheckAttrGroupCircularRecur(attrGr,
            (xmlSchemaItemListPtr) attrGr->attrUses);   
        if (circ != NULL) {
            xmlChar *str = NULL;
            /*
            * TODO: Report the referenced attr group as QName.
            */
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_SRC_ATTRIBUTE_GROUP_3,
                NULL, WXS_ITEM_NODE(WXS_BASIC_CAST circ),
                "Circular reference to the attribute group '%s' "
                "defined", xmlSchemaGetComponentQName(&str, attrGr));
            FREE_AND_NULL(str);
            /*
            * NOTE: We will cut the reference to avoid further
            * confusion of the processor.
            * BADSPEC TODO: The spec should define how to process in this case.
            */
            circ->item = NULL;
            return(ctxt->err);
        }
    }
    return(0);
}

static int
xmlSchemaAttributeGroupExpandRefs(xmlSchemaParserCtxtPtr pctxt,
                                  xmlSchemaAttributeGroupPtr attrGr);

/**
 * xmlSchemaExpandAttributeGroupRefs:
 * @pctxt: the parser context
 * @node: the node of the component holding the attribute uses
 * @completeWild: the intersected wildcard to be returned 
 * @list: the attribute uses
 *
 * Substitutes contained attribute group references
 * for their attribute uses. Wilcards are intersected.
 * Attribute use prohibitions are removed from the list
 * and returned via the @prohibs list.
 * Pointlessness of attr. prohibs, if a matching attr. decl
 * is existent a well, are checked.
 */
static int
xmlSchemaExpandAttributeGroupRefs(xmlSchemaParserCtxtPtr pctxt,
                                  xmlSchemaBasicItemPtr item,
                                  xmlSchemaWildcardPtr *completeWild,
                                  xmlSchemaItemListPtr list,
                                  xmlSchemaItemListPtr prohibs)
{
    xmlSchemaAttributeGroupPtr gr;
    xmlSchemaAttributeUsePtr use;
    xmlSchemaItemListPtr sublist;
    int i, j;
    int created = (*completeWild == NULL) ? 0 : 1;

    if (prohibs)
        prohibs->nbItems = 0;

    for (i = 0; i < list->nbItems; i++) {
        use = list->items[i];

        if (use->type == XML_SCHEMA_EXTRA_ATTR_USE_PROHIB) {        
            if (prohibs == NULL) {
                PERROR_INT("xmlSchemaExpandAttributeGroupRefs",
                    "unexpected attr prohibition found");
                return(-1);
            }
            /*
            * Remove from attribute uses.
            */
            if (xmlSchemaItemListRemove(list, i) == -1)
                return(-1);
            i--;
            /*
            * Note that duplicate prohibitions were already
            * handled at parsing time.
            */      
            /*
            * Add to list of prohibitions.
            */
            xmlSchemaItemListAddSize(prohibs, 2, use);
            continue;
        }
        if ((use->type == XML_SCHEMA_EXTRA_QNAMEREF) &&
            ((WXS_QNAME_CAST use)->itemType == XML_SCHEMA_TYPE_ATTRIBUTEGROUP))
        {
            if ((WXS_QNAME_CAST use)->item == NULL)
                return(-1);
            gr = WXS_ATTR_GROUP_CAST (WXS_QNAME_CAST use)->item;
            /*
            * Expand the referenced attr. group.
            * TODO: remove this, this is done in a previous step, so
            * already done here.
            */
            if ((gr->flags & XML_SCHEMAS_ATTRGROUP_WILDCARD_BUILDED) == 0) {
                if (xmlSchemaAttributeGroupExpandRefs(pctxt, gr) == -1)
                    return(-1);
            }
            /*
            * Build the 'complete' wildcard; i.e. intersect multiple
            * wildcards.
            */
            if (gr->attributeWildcard != NULL) {
                if (*completeWild == NULL) {
                    *completeWild = gr->attributeWildcard;
                } else {
                    if (! created) {
                        xmlSchemaWildcardPtr tmpWild;

                         /*
                        * Copy the first encountered wildcard as context,
                        * except for the annotation.
                        *
                        * Although the complete wildcard might not correspond
                        * to any node in the schema, we will anchor it on
                        * the node of the owner component.
                        */
                        tmpWild =  xmlSchemaAddWildcard(pctxt, pctxt->schema,
                            XML_SCHEMA_TYPE_ANY_ATTRIBUTE,
                            WXS_ITEM_NODE(item));
                        if (tmpWild == NULL)
                            return(-1);
                        if (xmlSchemaCloneWildcardNsConstraints(pctxt,
                            tmpWild, *completeWild) == -1)
                            return (-1);
                        tmpWild->processContents = (*completeWild)->processContents;
                        *completeWild = tmpWild;
                        created = 1;
                    }
                    
                    if (xmlSchemaIntersectWildcards(pctxt, *completeWild,
                        gr->attributeWildcard) == -1)
                        return(-1);
                }
            }
            /*
            * Just remove the reference if the referenced group does not
            * contain any attribute uses.
            */
            if (gr->attrUses == NULL) {
                if (xmlSchemaItemListRemove(list, i) == -1)
                    return(-1);
                i--;
                continue;
            }
            /*
            * Add the attribute uses.
            */
            sublist = ((xmlSchemaItemListPtr) gr->attrUses);
            if (sublist->nbItems != 0) {
                list->items[i] = sublist->items[0];
                if (sublist->nbItems != 1) {
                    for (j = 1; j < sublist->nbItems; j++) {
                        i++;
                        if (xmlSchemaItemListInsert(list,
                                sublist->items[j], i) == -1)
                            return(-1);
                    }
                }
            }         
        }

    }
    /*
    * Handle pointless prohibitions of declared attributes.
    */
    if (prohibs && (prohibs->nbItems != 0) && (list->nbItems != 0)) {
        xmlSchemaAttributeUseProhibPtr prohib;

        for (i = prohibs->nbItems -1; i >= 0; i--) {
            prohib = prohibs->items[i];
            for (j = 0; j < list->nbItems; j++) {
                use = list->items[j];

                if ((prohib->name == WXS_ATTRUSE_DECL_NAME(use)) &&
                    (prohib->targetNamespace == WXS_ATTRUSE_DECL_TNS(use)))
                {
                    xmlChar *str = NULL;

                    xmlSchemaCustomWarning(ACTXT_CAST pctxt,
                        XML_SCHEMAP_WARN_ATTR_POINTLESS_PROH,
                        prohib->node, NULL,
                        "Skipping pointless attribute use prohibition "
                        "'%s', since a corresponding attribute use "
                        "exists already in the type definition",
                        xmlSchemaFormatQName(&str,
                            prohib->targetNamespace, prohib->name),
                        NULL, NULL);
                    FREE_AND_NULL(str);
                    /*
                    * Remove the prohibition.
                    */
                    if (xmlSchemaItemListRemove(prohibs, i) == -1)
                        return(-1);
                    break;
                }
            }
        }
    }
    return(0);
}

/**
 * xmlSchemaAttributeGroupExpandRefs:
 * @pctxt:  the parser context
 * @attrGr:  the attribute group definition 
 *
 * Computation of:
 * {attribute uses} property
 * {attribute wildcard} property
 *
 * Substitutes contained attribute group references
 * for their attribute uses. Wilcards are intersected.
 */
static int
xmlSchemaAttributeGroupExpandRefs(xmlSchemaParserCtxtPtr pctxt,
                                  xmlSchemaAttributeGroupPtr attrGr)
{  
    if ((attrGr->attrUses == NULL) ||
        (attrGr->flags & XML_SCHEMAS_ATTRGROUP_WILDCARD_BUILDED))
        return(0);

    attrGr->flags |= XML_SCHEMAS_ATTRGROUP_WILDCARD_BUILDED;
    if (xmlSchemaExpandAttributeGroupRefs(pctxt, WXS_BASIC_CAST attrGr,
        &(attrGr->attributeWildcard), attrGr->attrUses, NULL) == -1)
        return(-1);    
    return(0);
}

/**
 * xmlSchemaAttributeGroupExpandRefs:
 * @pctxt:  the parser context
 * @attrGr:  the attribute group definition 
 *
 * Substitutes contained attribute group references
 * for their attribute uses. Wilcards are intersected.
 * 
 * Schema Component Constraint:
 *    Attribute Group Definition Properties Correct (ag-props-correct) 
 */
static int
xmlSchemaCheckAGPropsCorrect(xmlSchemaParserCtxtPtr pctxt,
                                  xmlSchemaAttributeGroupPtr attrGr)
{  
    /*
    * SPEC ag-props-correct
    * (1) "The values of the properties of an attribute group definition
    * must be as described in the property tableau in The Attribute
    * Group Definition Schema Component (§3.6.1), modulo the impact of
    * Missing Sub-components (§5.3);"
    */
    
    if ((attrGr->attrUses != NULL) &&
        (WXS_LIST_CAST attrGr->attrUses)->nbItems > 1)
    {
        xmlSchemaItemListPtr uses = WXS_LIST_CAST attrGr->attrUses;
        xmlSchemaAttributeUsePtr use, tmp;
        int i, j, hasId = 0;

        for (i = uses->nbItems -1; i >= 0; i--) {
            use = uses->items[i];           
            /*
            * SPEC ag-props-correct
            * (2) "Two distinct members of the {attribute uses} must not have
            * {attribute declaration}s both of whose {name}s match and whose
            * {target namespace}s are identical."
            */
            if (i > 0) {
                for (j = i -1; j >= 0; j--) {
                    tmp = uses->items[j];
                    if ((WXS_ATTRUSE_DECL_NAME(use) ==
                        WXS_ATTRUSE_DECL_NAME(tmp)) &&
                        (WXS_ATTRUSE_DECL_TNS(use) ==
                        WXS_ATTRUSE_DECL_TNS(tmp)))
                    {
                        xmlChar *str = NULL;
                        
                        xmlSchemaCustomErr(ACTXT_CAST pctxt,
                            XML_SCHEMAP_AG_PROPS_CORRECT,
                            attrGr->node, WXS_BASIC_CAST attrGr,
                            "Duplicate %s",
                            xmlSchemaGetComponentDesignation(&str, use),
                            NULL);
                        FREE_AND_NULL(str);
                        /*
                        * Remove the duplicate.
                        */
                        if (xmlSchemaItemListRemove(uses, i) == -1)
                            return(-1);
                        goto next_use;
                    }
                }
            }
            /*
            * SPEC ag-props-correct
            * (3) "Two distinct members of the {attribute uses} must not have
            * {attribute declaration}s both of whose {type definition}s are or
            * are derived from ID."
            * TODO: Does 'derived' include member-types of unions?
            */
            if (WXS_ATTRUSE_TYPEDEF(use) != NULL) {             
                if (xmlSchemaIsDerivedFromBuiltInType(
                    WXS_ATTRUSE_TYPEDEF(use), XML_SCHEMAS_ID))
                {               
                    if (hasId) {
                        xmlChar *str = NULL;
                        
                        xmlSchemaCustomErr(ACTXT_CAST pctxt,
                            XML_SCHEMAP_AG_PROPS_CORRECT,
                            attrGr->node, WXS_BASIC_CAST attrGr,
                            "There must not exist more than one attribute "
                            "declaration of type 'xs:ID' "
                            "(or derived from 'xs:ID'). The %s violates this "
                            "constraint",
                            xmlSchemaGetComponentDesignation(&str, use),
                            NULL);
                        FREE_AND_NULL(str);
                        if (xmlSchemaItemListRemove(uses, i) == -1)
                            return(-1);
                    }               
                    hasId = 1;
                }
            }
next_use: {}
        }
    }
    return(0);
}

/**
 * xmlSchemaResolveAttrGroupReferences:
 * @attrgrpDecl:  the schema attribute definition
 * @ctxt:  the schema parser context
 * @name:  the attribute name
 *
 * Resolves references to attribute group definitions.
 */
static int
xmlSchemaResolveAttrGroupReferences(xmlSchemaQNameRefPtr ref,
                                    xmlSchemaParserCtxtPtr ctxt)
{
    xmlSchemaAttributeGroupPtr group;

    if (ref->item != NULL)
        return(0);
    group = xmlSchemaGetAttributeGroup(ctxt->schema,
        ref->name,
        ref->targetNamespace);
    if (group == NULL) {
        xmlSchemaPResCompAttrErr(ctxt,
            XML_SCHEMAP_SRC_RESOLVE,
            NULL, ref->node,
            "ref", ref->name, ref->targetNamespace,
            ref->itemType, NULL);
        return(ctxt->err);
    }
    ref->item = WXS_BASIC_CAST group;
    return(0);
}

/**
 * xmlSchemaCheckAttrPropsCorrect:
 * @item:  an schema attribute declaration/use
 * @ctxt:  a schema parser context
 * @name:  the name of the attribute
 *
 *
 * Schema Component Constraint:
 *    Attribute Declaration Properties Correct (a-props-correct)
 *
 * Validates the value constraints of an attribute declaration/use.
 * NOTE that this needs the simle type definitions to be already
 *   builded and checked.
 */
static int
xmlSchemaCheckAttrPropsCorrect(xmlSchemaParserCtxtPtr pctxt,
                               xmlSchemaAttributePtr attr)
{

    /*
    * SPEC a-props-correct (1)
    * "The values of the properties of an attribute declaration must
    * be as described in the property tableau in The Attribute
    * Declaration Schema Component (§3.2.1), modulo the impact of
    * Missing Sub-components (§5.3)."
    */
    
    if (WXS_ATTR_TYPEDEF(attr) == NULL)
        return(0);

    if (attr->defValue != NULL) {
        int ret;

        /*
        * SPEC a-props-correct (3)
        * "If the {type definition} is or is derived from ID then there
        * must not be a {value constraint}."
        */
        if (xmlSchemaIsDerivedFromBuiltInType(
            WXS_ATTR_TYPEDEF(attr), XML_SCHEMAS_ID))
        {
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                XML_SCHEMAP_A_PROPS_CORRECT_3,
                NULL, WXS_BASIC_CAST attr,
                "Value constraints are not allowed if the type definition "
                "is or is derived from xs:ID",
                NULL, NULL);
            return(pctxt->err);
        }
        /*
        * SPEC a-props-correct (2)
        * "if there is a {value constraint}, the canonical lexical
        * representation of its value must be ·valid· with respect
        * to the {type definition} as defined in String Valid (§3.14.4)."
        * TODO: Don't care about the *cononical* stuff here, this requirement
        * will be removed in WXS 1.1 anyway.
        */
        ret = xmlSchemaVCheckCVCSimpleType(ACTXT_CAST pctxt,
            attr->node, WXS_ATTR_TYPEDEF(attr),
            attr->defValue, &(attr->defVal),
            1, 1, 0);
        if (ret != 0) {
            if (ret < 0) {
                PERROR_INT("xmlSchemaCheckAttrPropsCorrect",
                    "calling xmlSchemaVCheckCVCSimpleType()");
                return(-1);
            }
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                XML_SCHEMAP_A_PROPS_CORRECT_2,
                NULL, WXS_BASIC_CAST attr,
                "The value of the value constraint is not valid",
                NULL, NULL);
            return(pctxt->err);
        }
    }
   
    return(0);
}

static xmlSchemaElementPtr
xmlSchemaCheckSubstGroupCircular(xmlSchemaElementPtr elemDecl,
                                 xmlSchemaElementPtr ancestor)
{
    xmlSchemaElementPtr ret;

    if (WXS_SUBST_HEAD(ancestor) == NULL)
        return (NULL);
    if (WXS_SUBST_HEAD(ancestor) == elemDecl)
        return (ancestor);

    if (WXS_SUBST_HEAD(ancestor)->flags & XML_SCHEMAS_ELEM_CIRCULAR)
        return (NULL);
    WXS_SUBST_HEAD(ancestor)->flags |= XML_SCHEMAS_ELEM_CIRCULAR;
    ret = xmlSchemaCheckSubstGroupCircular(elemDecl,
        WXS_SUBST_HEAD(ancestor));
    WXS_SUBST_HEAD(ancestor)->flags ^= XML_SCHEMAS_ELEM_CIRCULAR;

    return (ret);
}

/**
 * xmlSchemaCheckElemPropsCorrect:
 * @ctxt:  a schema parser context
 * @decl: the element declaration
 * @name:  the name of the attribute
 *
 * Schema Component Constraint:
 * Element Declaration Properties Correct (e-props-correct)
 *
 * STATUS:
 *   missing: (6)
 */
static int
xmlSchemaCheckElemPropsCorrect(xmlSchemaParserCtxtPtr pctxt,
                               xmlSchemaElementPtr elemDecl)
{
    int ret = 0;
    xmlSchemaTypePtr typeDef = WXS_ELEM_TYPEDEF(elemDecl);
    /*
    * SPEC (1) "The values of the properties of an element declaration
    * must be as described in the property tableau in The Element
    * Declaration Schema Component (§3.3.1), modulo the impact of Missing
    * Sub-components (§5.3)."
    */
    if (WXS_SUBST_HEAD(elemDecl) != NULL) {
        xmlSchemaElementPtr head = WXS_SUBST_HEAD(elemDecl), circ;

        xmlSchemaCheckElementDeclComponent(head, pctxt);
        /*
        * SPEC (3) "If there is a non-·absent· {substitution group
        * affiliation}, then {scope} must be global."
        */
        if ((elemDecl->flags & XML_SCHEMAS_ELEM_GLOBAL) == 0) {
            xmlSchemaPCustomErr(pctxt,
                XML_SCHEMAP_E_PROPS_CORRECT_3,
                WXS_BASIC_CAST elemDecl, NULL,
                "Only global element declarations can have a "
                "substitution group affiliation", NULL);
            ret = XML_SCHEMAP_E_PROPS_CORRECT_3;
        }
        /*
        * TODO: SPEC (6) "Circular substitution groups are disallowed.
        * That is, it must not be possible to return to an element declaration
        * by repeatedly following the {substitution group affiliation}
        * property."
        */
        if (head == elemDecl)
            circ = head;
        else if (WXS_SUBST_HEAD(head) != NULL)
            circ = xmlSchemaCheckSubstGroupCircular(head, head);
        else
            circ = NULL;
        if (circ != NULL) {
            xmlChar *strA = NULL, *strB = NULL;

            xmlSchemaPCustomErrExt(pctxt,
                XML_SCHEMAP_E_PROPS_CORRECT_6,
                WXS_BASIC_CAST circ, NULL,
                "The element declaration '%s' defines a circular "
                "substitution group to element declaration '%s'",
                xmlSchemaGetComponentQName(&strA, circ),
                xmlSchemaGetComponentQName(&strB, head),
                NULL);
            FREE_AND_NULL(strA)
            FREE_AND_NULL(strB)
            ret = XML_SCHEMAP_E_PROPS_CORRECT_6;
        }
        /*
        * SPEC (4) "If there is a {substitution group affiliation},
        * the {type definition}
        * of the element declaration must be validly derived from the {type
        * definition} of the {substitution group affiliation}, given the value
        * of the {substitution group exclusions} of the {substitution group
        * affiliation}, as defined in Type Derivation OK (Complex) (§3.4.6)
        * (if the {type definition} is complex) or as defined in
        * Type Derivation OK (Simple) (§3.14.6) (if the {type definition} is
        * simple)."
        *
        * NOTE: {substitution group exclusions} means the values of the
        * attribute "final".
        */

        if (typeDef != WXS_ELEM_TYPEDEF(WXS_SUBST_HEAD(elemDecl))) {
            int set = 0;

            if (head->flags & XML_SCHEMAS_ELEM_FINAL_EXTENSION)
                set |= SUBSET_EXTENSION;
            if (head->flags & XML_SCHEMAS_ELEM_FINAL_RESTRICTION)
                set |= SUBSET_RESTRICTION;

            if (xmlSchemaCheckCOSDerivedOK(ACTXT_CAST pctxt, typeDef,
                WXS_ELEM_TYPEDEF(head), set) != 0) {
                xmlChar *strA = NULL, *strB = NULL, *strC = NULL;

                ret = XML_SCHEMAP_E_PROPS_CORRECT_4;
                xmlSchemaPCustomErrExt(pctxt,
                    XML_SCHEMAP_E_PROPS_CORRECT_4,
                    WXS_BASIC_CAST elemDecl, NULL,
                    "The type definition '%s' was "
                    "either rejected by the substitution group "
                    "affiliation '%s', or not validly derived from its type "
                    "definition '%s'",
                    xmlSchemaGetComponentQName(&strA, typeDef),
                    xmlSchemaGetComponentQName(&strB, head),
                    xmlSchemaGetComponentQName(&strC, WXS_ELEM_TYPEDEF(head)));
                FREE_AND_NULL(strA)
                FREE_AND_NULL(strB)
                FREE_AND_NULL(strC)
            }
        }
    }
    /*
    * SPEC (5) "If the {type definition} or {type definition}'s
    * {content type}
    * is or is derived from ID then there must not be a {value constraint}.
    * Note: The use of ID as a type definition for elements goes beyond
    * XML 1.0, and should be avoided if backwards compatibility is desired"
    */
    if ((elemDecl->value != NULL) &&
        ((WXS_IS_SIMPLE(typeDef) &&
          xmlSchemaIsDerivedFromBuiltInType(typeDef, XML_SCHEMAS_ID)) ||
         (WXS_IS_COMPLEX(typeDef) &&
          WXS_HAS_SIMPLE_CONTENT(typeDef) &&
          xmlSchemaIsDerivedFromBuiltInType(typeDef->contentTypeDef,
            XML_SCHEMAS_ID)))) {

        ret = XML_SCHEMAP_E_PROPS_CORRECT_5;
        xmlSchemaPCustomErr(pctxt,
            XML_SCHEMAP_E_PROPS_CORRECT_5,
            WXS_BASIC_CAST elemDecl, NULL,
            "The type definition (or type definition's content type) is or "
            "is derived from ID; value constraints are not allowed in "
            "conjunction with such a type definition", NULL);
    } else if (elemDecl->value != NULL) {
        int vcret;
        xmlNodePtr node = NULL;

        /*
        * SPEC (2) "If there is a {value constraint}, the canonical lexical
        * representation of its value must be ·valid· with respect to the
        * {type definition} as defined in Element Default Valid (Immediate)
        * (§3.3.6)."
        */
        if (typeDef == NULL) {
            xmlSchemaPErr(pctxt, elemDecl->node,
                XML_SCHEMAP_INTERNAL,
                "Internal error: xmlSchemaCheckElemPropsCorrect, "
                "type is missing... skipping validation of "
                "the value constraint", NULL, NULL);
            return (-1);
        }
        if (elemDecl->node != NULL) {
            if (elemDecl->flags & XML_SCHEMAS_ELEM_FIXED)
                node = (xmlNodePtr) xmlHasProp(elemDecl->node,
                    BAD_CAST "fixed");
            else
                node = (xmlNodePtr) xmlHasProp(elemDecl->node,
                    BAD_CAST "default");
        }
        vcret = xmlSchemaParseCheckCOSValidDefault(pctxt, node,
            typeDef, elemDecl->value, &(elemDecl->defVal));
        if (vcret != 0) {
            if (vcret < 0) {
                PERROR_INT("xmlSchemaElemCheckValConstr",
                    "failed to validate the value constraint of an "
                    "element declaration");
                return (-1);
            }
            return (vcret);
        }
    }

    return (ret);
}

/**
 * xmlSchemaCheckElemSubstGroup:
 * @ctxt:  a schema parser context
 * @decl: the element declaration
 * @name:  the name of the attribute
 *
 * Schema Component Constraint:
 * Substitution Group (cos-equiv-class)
 *
 * In Libxml2 the subst. groups will be precomputed, in terms of that
 * a list will be built for each subst. group head, holding all direct
 * referents to this head.
 * NOTE that this function needs:
 *   1. circular subst. groups to be checked beforehand
 *   2. the declaration's type to be derived from the head's type
 *
 * STATUS:
 *
 */
static void
xmlSchemaCheckElemSubstGroup(xmlSchemaParserCtxtPtr ctxt,
                             xmlSchemaElementPtr elemDecl)
{
    if ((WXS_SUBST_HEAD(elemDecl) == NULL) ||
        /* SPEC (1) "Its {abstract} is false." */
        (elemDecl->flags & XML_SCHEMAS_ELEM_ABSTRACT))
        return;
    {
        xmlSchemaElementPtr head;
        xmlSchemaTypePtr headType, type;
        int set, methSet;
        /*
        * SPEC (2) "It is validly substitutable for HEAD subject to HEAD's
        * {disallowed substitutions} as the blocking constraint, as defined in
        * Substitution Group OK (Transitive) (§3.3.6)."
        */
        for (head = WXS_SUBST_HEAD(elemDecl); head != NULL;
            head = WXS_SUBST_HEAD(head)) {
            set = 0;
            methSet = 0;
            /*
            * The blocking constraints.
            */
            if (head->flags & XML_SCHEMAS_ELEM_BLOCK_SUBSTITUTION)
                continue;
            headType = head->subtypes;
            type = elemDecl->subtypes;
            if (headType == type)
                goto add_member;
            if (head->flags & XML_SCHEMAS_ELEM_BLOCK_RESTRICTION)
                set |= XML_SCHEMAS_TYPE_BLOCK_RESTRICTION;
            if (head->flags & XML_SCHEMAS_ELEM_BLOCK_EXTENSION)
                set |= XML_SCHEMAS_TYPE_BLOCK_EXTENSION;
            /*
            * SPEC: Substitution Group OK (Transitive) (2.3)
            * "The set of all {derivation method}s involved in the
            * derivation of D's {type definition} from C's {type definition}
            * does not intersect with the union of the blocking constraint,
            * C's {prohibited substitutions} (if C is complex, otherwise the
            * empty set) and the {prohibited substitutions} (respectively the
            * empty set) of any intermediate {type definition}s in the
            * derivation of D's {type definition} from C's {type definition}."
            */
            /*
            * OPTIMIZE TODO: Optimize this a bit, since, if traversing the
            * subst.head axis, the methSet does not need to be computed for
            * the full depth over and over.
            */
            /*
            * The set of all {derivation method}s involved in the derivation
            */
            while ((type != NULL) && (type != headType)) {
                if ((WXS_IS_EXTENSION(type)) &&
                    ((methSet & XML_SCHEMAS_TYPE_BLOCK_RESTRICTION) == 0))
                    methSet |= XML_SCHEMAS_TYPE_BLOCK_EXTENSION;

                if (WXS_IS_RESTRICTION(type) &&
                    ((methSet & XML_SCHEMAS_TYPE_BLOCK_RESTRICTION) == 0))
                    methSet |= XML_SCHEMAS_TYPE_BLOCK_RESTRICTION;

                type = type->baseType;
            }
            /*
            * The {prohibited substitutions} of all intermediate types +
            * the head's type.
            */
            type = elemDecl->subtypes->baseType;
            while (type != NULL) {
                if (WXS_IS_COMPLEX(type)) {
                    if ((type->flags &
                            XML_SCHEMAS_TYPE_BLOCK_EXTENSION) &&
                        ((set & XML_SCHEMAS_TYPE_BLOCK_EXTENSION) == 0))
                    set |= XML_SCHEMAS_TYPE_BLOCK_EXTENSION;
                    if ((type->flags &
                            XML_SCHEMAS_TYPE_BLOCK_RESTRICTION) &&
                        ((set & XML_SCHEMAS_TYPE_BLOCK_RESTRICTION) == 0))
                    set |= XML_SCHEMAS_TYPE_BLOCK_RESTRICTION;
                } else
                    break;
                if (type == headType)
                    break;
                type = type->baseType;
            }
            if ((set != 0) &&
                (((set & XML_SCHEMAS_TYPE_BLOCK_EXTENSION) &&
                (methSet & XML_SCHEMAS_TYPE_BLOCK_EXTENSION)) ||
                ((set & XML_SCHEMAS_TYPE_BLOCK_RESTRICTION) &&
                (methSet & XML_SCHEMAS_TYPE_BLOCK_RESTRICTION)))) {
                continue;
            }
add_member:
            xmlSchemaAddElementSubstitutionMember(ctxt, head, elemDecl);
            if ((head->flags & XML_SCHEMAS_ELEM_SUBST_GROUP_HEAD) == 0)
                head->flags |= XML_SCHEMAS_ELEM_SUBST_GROUP_HEAD;
        }
    }
}

#ifdef WXS_ELEM_DECL_CONS_ENABLED /* enable when finished */
/**
 * xmlSchemaCheckElementDeclComponent
 * @pctxt: the schema parser context
 * @ctxtComponent: the context component (an element declaration)
 * @ctxtParticle: the first particle of the context component
 * @searchParticle: the element declaration particle to be analysed
 *
 * Schema Component Constraint: Element Declarations Consistent 
 */
static int
xmlSchemaCheckElementDeclConsistent(xmlSchemaParserCtxtPtr pctxt,
                                    xmlSchemaBasicItemPtr ctxtComponent,
                                    xmlSchemaParticlePtr ctxtParticle,                              
                                    xmlSchemaParticlePtr searchParticle,
                                    xmlSchemaParticlePtr curParticle,
                                    int search)
{
    return(0);

    int ret = 0;
    xmlSchemaParticlePtr cur = curParticle;
    if (curParticle == NULL) {  
        return(0);
    }
    if (WXS_PARTICLE_TERM(curParticle) == NULL) {
        /*
        * Just return in this case. A missing "term" of the particle
        * might arise due to an invalid "term" component.
        */
        return(0);
    }    
    while (cur != NULL) {
        switch (WXS_PARTICLE_TERM(cur)->type) {
            case XML_SCHEMA_TYPE_ANY:
                break;
            case XML_SCHEMA_TYPE_ELEMENT:
                if (search == 0) {
                    ret = xmlSchemaCheckElementDeclConsistent(pctxt,
                        ctxtComponent, ctxtParticle, cur, ctxtParticle, 1);
                    if (ret != 0)
                        return(ret);                
                } else {
                    xmlSchemaElementPtr elem =
                        WXS_ELEM_CAST(WXS_PARTICLE_TERM(cur));
                    /*
                    * SPEC Element Declarations Consistent:
                    * "If the {particles} contains, either directly,
                    * indirectly (that is, within the {particles} of a
                    * contained model group, recursively) or ·implicitly·
                    * two or more element declaration particles with
                    * the same {name} and {target namespace}, then
                    * all their type definitions must be the same
                    * top-level definition [...]"
                    */
                    if (xmlStrEqual(WXS_PARTICLE_TERM_AS_ELEM(cur)->name,
                            WXS_PARTICLE_TERM_AS_ELEM(searchParticle)->name) &&
                        xmlStrEqual(WXS_PARTICLE_TERM_AS_ELEM(cur)->targetNamespace,
                            WXS_PARTICLE_TERM_AS_ELEM(searchParticle)->targetNamespace))
                    {
                        xmlChar *strA = NULL, *strB = NULL;
                        
                        xmlSchemaCustomErr(ACTXT_CAST pctxt,
                            /* TODO: error code */
                            XML_SCHEMAP_COS_NONAMBIG,
                            WXS_ITEM_NODE(cur), NULL,
                            "In the content model of %s, there are multiple "
                            "element declarations for '%s' with different "
                            "type definitions",
                            xmlSchemaGetComponentDesignation(&strA,
                                ctxtComponent),
                            xmlSchemaFormatQName(&strB,
                                WXS_PARTICLE_TERM_AS_ELEM(cur)->targetNamespace,
                                WXS_PARTICLE_TERM_AS_ELEM(cur)->name));
                        FREE_AND_NULL(strA);
                        FREE_AND_NULL(strB);
                        return(XML_SCHEMAP_COS_NONAMBIG);
                    }
                }           
                break;
            case XML_SCHEMA_TYPE_SEQUENCE: {            
                break;
                }
            case XML_SCHEMA_TYPE_CHOICE:{
                /*
                xmlSchemaTreeItemPtr sub;
                
                sub = WXS_PARTICLE_TERM(particle)->children;  (xmlSchemaParticlePtr) 
                while (sub != NULL) {
                    ret = xmlSchemaCheckElementDeclConsistent(pctxt, ctxtComponent,
                        ctxtParticle, ctxtElem);
                    if (ret != 0)
                        return(ret);
                    sub = sub->next;
                }
                */
                break;
                }
            case XML_SCHEMA_TYPE_ALL:
                break;
            case XML_SCHEMA_TYPE_GROUP:
                break;
            default:
                xmlSchemaInternalErr2(ACTXT_CAST pctxt,
                    "xmlSchemaCheckElementDeclConsistent",
                    "found unexpected term of type '%s' in content model",
                    WXS_ITEM_TYPE_NAME(WXS_PARTICLE_TERM(cur)), NULL);
                return(-1);
        }
        cur = (xmlSchemaParticlePtr) cur->next;
    }

exit:
    return(ret);
}
#endif

/**
 * xmlSchemaCheckElementDeclComponent
 * @item:  an schema element declaration/particle
 * @ctxt:  a schema parser context
 * @name:  the name of the attribute
 *
 * Validates the value constraints of an element declaration.
 * Adds substitution group members. 
 */
static void
xmlSchemaCheckElementDeclComponent(xmlSchemaElementPtr elemDecl,
                                   xmlSchemaParserCtxtPtr ctxt)
{
    if (elemDecl == NULL)
        return;
    if (elemDecl->flags & XML_SCHEMAS_ELEM_INTERNAL_CHECKED)
        return;
    elemDecl->flags |= XML_SCHEMAS_ELEM_INTERNAL_CHECKED;
    if (xmlSchemaCheckElemPropsCorrect(ctxt, elemDecl) == 0) {
        /*
        * Adds substitution group members.
        */
        xmlSchemaCheckElemSubstGroup(ctxt, elemDecl);   
    }
}

/**
 * xmlSchemaResolveModelGroupParticleReferences:
 * @particle:  a particle component
 * @ctxt:  a parser context
 *
 * Resolves references of a model group's {particles} to
 * model group definitions and to element declarations.
 */
static void
xmlSchemaResolveModelGroupParticleReferences(
    xmlSchemaParserCtxtPtr ctxt,
    xmlSchemaModelGroupPtr mg)
{
    xmlSchemaParticlePtr particle = WXS_MODELGROUP_PARTICLE(mg);
    xmlSchemaQNameRefPtr ref;
    xmlSchemaBasicItemPtr refItem;

    /*
    * URGENT TODO: Test this.
    */
    while (particle != NULL) {
        if ((WXS_PARTICLE_TERM(particle) == NULL) ||
            ((WXS_PARTICLE_TERM(particle))->type !=
                XML_SCHEMA_EXTRA_QNAMEREF))
        {
            goto next_particle;
        } 
        ref = WXS_QNAME_CAST WXS_PARTICLE_TERM(particle);
        /*
        * Resolve the reference.
        * NULL the {term} by default.
        */
        particle->children = NULL;

        refItem = xmlSchemaGetNamedComponent(ctxt->schema,
            ref->itemType, ref->name, ref->targetNamespace);
        if (refItem == NULL) {
            xmlSchemaPResCompAttrErr(ctxt, XML_SCHEMAP_SRC_RESOLVE,
                NULL, WXS_ITEM_NODE(particle), "ref", ref->name,
                ref->targetNamespace, ref->itemType, NULL);
            /* TODO: remove the particle. */
            goto next_particle;
        } 
        if (refItem->type == XML_SCHEMA_TYPE_GROUP) {
            if (WXS_MODELGROUPDEF_MODEL(refItem) == NULL)
                /* TODO: remove the particle. */
                goto next_particle;
            /*
            * NOTE that we will assign the model group definition
            * itself to the "term" of the particle. This will ease
            * the check for circular model group definitions. After
            * that the "term" will be assigned the model group of the
            * model group definition.
            */
            if ((WXS_MODELGROUPDEF_MODEL(refItem))->type ==
                    XML_SCHEMA_TYPE_ALL) {
                /*
                * SPEC cos-all-limited (1)
                * SPEC cos-all-limited (1.2)
                * "It appears only as the value of one or both of the
                * following properties:"
                * (1.1) "the {model group} property of a model group
                *        definition."
                * (1.2) "the {term} property of a particle [... of] the "
                * {content type} of a complex type definition."
                */
                xmlSchemaCustomErr(ACTXT_CAST ctxt,
                    /* TODO: error code */
                    XML_SCHEMAP_COS_ALL_LIMITED,
                    WXS_ITEM_NODE(particle), NULL,
                    "A model group definition is referenced, but "
                    "it contains an 'all' model group, which "
                    "cannot be contained by model groups",
                    NULL, NULL);
                /* TODO: remove the particle. */
                goto next_particle;
            }
            particle->children = (xmlSchemaTreeItemPtr) refItem;
        } else {
            /*
            * TODO: Are referenced element declarations the only
            * other components we expect here?
            */
            particle->children = (xmlSchemaTreeItemPtr) refItem;
        }
next_particle:
        particle = WXS_PTC_CAST particle->next;
    }
}

static int
xmlSchemaAreValuesEqual(xmlSchemaValPtr x,
                       xmlSchemaValPtr y) 
{   
    xmlSchemaTypePtr tx, ty, ptx, pty;    
    int ret;

    while (x != NULL) {
        /* Same types. */
        tx = xmlSchemaGetBuiltInType(xmlSchemaGetValType(x));
        ty = xmlSchemaGetBuiltInType(xmlSchemaGetValType(y));
        ptx = xmlSchemaGetPrimitiveType(tx);
        pty = xmlSchemaGetPrimitiveType(ty);
        /*
        * (1) if a datatype T' is ·derived· by ·restriction· from an
        * atomic datatype T then the ·value space· of T' is a subset of
        * the ·value space· of T. */
        /*
        * (2) if datatypes T' and T'' are ·derived· by ·restriction·
        * from a common atomic ancestor T then the ·value space·s of T'
        * and T'' may overlap.
        */
        if (ptx != pty)
            return(0);
        /*
        * We assume computed values to be normalized, so do a fast
        * string comparison for string based types.
        */
        if ((ptx->builtInType == XML_SCHEMAS_STRING) ||
            WXS_IS_ANY_SIMPLE_TYPE(ptx)) {
            if (! xmlStrEqual(
                xmlSchemaValueGetAsString(x),
                xmlSchemaValueGetAsString(y)))
                return (0);
        } else {
            ret = xmlSchemaCompareValuesWhtsp(
                x, XML_SCHEMA_WHITESPACE_PRESERVE,
                y, XML_SCHEMA_WHITESPACE_PRESERVE);
            if (ret == -2)
                return(-1);
            if (ret != 0)
                return(0);
        }
        /*
        * Lists.
        */
        x = xmlSchemaValueGetNext(x);
        if (x != NULL) {
            y = xmlSchemaValueGetNext(y);
            if (y == NULL)
                return (0);         
        } else if (xmlSchemaValueGetNext(y) != NULL)
            return (0);
        else
            return (1);
    }
    return (0);
}

/**
 * xmlSchemaResolveAttrUseReferences:
 * @item:  an attribute use
 * @ctxt:  a parser context
 *
 * Resolves the referenced attribute declaration.
 */
static int
xmlSchemaResolveAttrUseReferences(xmlSchemaAttributeUsePtr ause,
                                  xmlSchemaParserCtxtPtr ctxt)
{
    if ((ctxt == NULL) || (ause == NULL))
        return(-1);
    if ((ause->attrDecl == NULL) ||
        (ause->attrDecl->type != XML_SCHEMA_EXTRA_QNAMEREF))
        return(0);

    {
        xmlSchemaQNameRefPtr ref = WXS_QNAME_CAST ause->attrDecl;

        /*
        * TODO: Evaluate, what errors could occur if the declaration is not
        * found.
        */
        ause->attrDecl = xmlSchemaGetAttributeDecl(ctxt->schema,
            ref->name, ref->targetNamespace);
        if (ause->attrDecl == NULL) {
            xmlSchemaPResCompAttrErr(ctxt,
                XML_SCHEMAP_SRC_RESOLVE,
                WXS_BASIC_CAST ause, ause->node,
                "ref", ref->name, ref->targetNamespace,
                XML_SCHEMA_TYPE_ATTRIBUTE, NULL);
            return(ctxt->err);;
        }
    }
    return(0);
}

/**
 * xmlSchemaCheckAttrUsePropsCorrect:
 * @ctxt:  a parser context
 * @use:  an attribute use 
 *
 * Schema Component Constraint:
 * Attribute Use Correct (au-props-correct)
 * 
 */
static int
xmlSchemaCheckAttrUsePropsCorrect(xmlSchemaParserCtxtPtr ctxt,
                             xmlSchemaAttributeUsePtr use)
{
    if ((ctxt == NULL) || (use == NULL))
        return(-1);
    if ((use->defValue == NULL) || (WXS_ATTRUSE_DECL(use) == NULL) ||
        ((WXS_ATTRUSE_DECL(use))->type != XML_SCHEMA_TYPE_ATTRIBUTE))
        return(0);      

    /*
    * SPEC au-props-correct (1)
    * "The values of the properties of an attribute use must be as
    * described in the property tableau in The Attribute Use Schema
    * Component (§3.5.1), modulo the impact of Missing
    * Sub-components (§5.3)."
    */
    
    if (((WXS_ATTRUSE_DECL(use))->defValue != NULL) &&
        ((WXS_ATTRUSE_DECL(use))->flags & XML_SCHEMAS_ATTR_FIXED) &&
        ((use->flags & XML_SCHEMA_ATTR_USE_FIXED) == 0))
    {
        xmlSchemaPCustomErr(ctxt,
            XML_SCHEMAP_AU_PROPS_CORRECT_2,
            WXS_BASIC_CAST use, NULL,
            "The attribute declaration has a 'fixed' value constraint "
            ", thus the attribute use must also have a 'fixed' value "
            "constraint",
            NULL);
        return(ctxt->err);
    }
    /*
    * Compute and check the value constraint's value.
    */
    if ((use->defVal != NULL) && (WXS_ATTRUSE_TYPEDEF(use) != NULL)) {
        int ret;
        /*
        * TODO: The spec seems to be missing a check of the 
        * value constraint of the attribute use. We will do it here.
        */
        /*
        * SPEC a-props-correct (3)
        */
        if (xmlSchemaIsDerivedFromBuiltInType(
            WXS_ATTRUSE_TYPEDEF(use), XML_SCHEMAS_ID))
        {
            xmlSchemaCustomErr(ACTXT_CAST ctxt,
                XML_SCHEMAP_AU_PROPS_CORRECT,
                NULL, WXS_BASIC_CAST use,
                "Value constraints are not allowed if the type definition "
                "is or is derived from xs:ID",
                NULL, NULL);
            return(ctxt->err);
        }
        
        ret = xmlSchemaVCheckCVCSimpleType(ACTXT_CAST ctxt,
            use->node, WXS_ATTRUSE_TYPEDEF(use),
            use->defValue, &(use->defVal),
            1, 1, 0);
        if (ret != 0) {
            if (ret < 0) {
                PERROR_INT2("xmlSchemaCheckAttrUsePropsCorrect",
                    "calling xmlSchemaVCheckCVCSimpleType()");
                return(-1);
            }
            xmlSchemaCustomErr(ACTXT_CAST ctxt,
                XML_SCHEMAP_AU_PROPS_CORRECT,
                NULL, WXS_BASIC_CAST use,
                "The value of the value constraint is not valid",
                NULL, NULL);
            return(ctxt->err);
        }
    }
    /*
    * SPEC au-props-correct (2)
    * "If the {attribute declaration} has a fixed
    * {value constraint}, then if the attribute use itself has a
    * {value constraint}, it must also be fixed and its value must match
    * that of the {attribute declaration}'s {value constraint}."
    */
    if (((WXS_ATTRUSE_DECL(use))->defVal != NULL) &&
        (((WXS_ATTRUSE_DECL(use))->flags & XML_SCHEMA_ATTR_USE_FIXED) == 0))
    {
        if (! xmlSchemaAreValuesEqual(use->defVal,
                (WXS_ATTRUSE_DECL(use))->defVal))
        {
            xmlSchemaPCustomErr(ctxt,
                XML_SCHEMAP_AU_PROPS_CORRECT_2,
                WXS_BASIC_CAST use, NULL,
                "The 'fixed' value constraint of the attribute use "
                "must match the attribute declaration's value "
                "constraint '%s'",
                (WXS_ATTRUSE_DECL(use))->defValue);
        }
        return(ctxt->err);
    }
    return(0);
}




/**
 * xmlSchemaResolveAttrTypeReferences:
 * @item:  an attribute declaration
 * @ctxt:  a parser context 
 *
 * Resolves the referenced type definition component.
 */
static int
xmlSchemaResolveAttrTypeReferences(xmlSchemaAttributePtr item,
                                   xmlSchemaParserCtxtPtr ctxt)
{
    /*
    * The simple type definition corresponding to the <simpleType> element
    * information item in the [children], if present, otherwise the simple
    * type definition ·resolved· to by the ·actual value· of the type
    * [attribute], if present, otherwise the ·simple ur-type definition·.
    */
    if (item->flags & XML_SCHEMAS_ATTR_INTERNAL_RESOLVED)
        return(0);
    item->flags |= XML_SCHEMAS_ATTR_INTERNAL_RESOLVED;
    if (item->subtypes != NULL)
        return(0);
    if (item->typeName != NULL) {
        xmlSchemaTypePtr type;

        type = xmlSchemaGetType(ctxt->schema, item->typeName,
            item->typeNs);
        if ((type == NULL) || (! WXS_IS_SIMPLE(type))) {
            xmlSchemaPResCompAttrErr(ctxt,
                XML_SCHEMAP_SRC_RESOLVE,
                WXS_BASIC_CAST item, item->node,
                "type", item->typeName, item->typeNs,
                XML_SCHEMA_TYPE_SIMPLE, NULL);
            return(ctxt->err);
        } else
            item->subtypes = type;

    } else {
        /*
        * The type defaults to the xs:anySimpleType.
        */
        item->subtypes = xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYSIMPLETYPE);
    }
    return(0);
}

/**
 * xmlSchemaResolveIDCKeyReferences:
 * @idc:  the identity-constraint definition
 * @ctxt:  the schema parser context
 * @name:  the attribute name
 *
 * Resolve keyRef references to key/unique IDCs.
 * Schema Component Constraint:
 *   Identity-constraint Definition Properties Correct (c-props-correct)
 */
static int
xmlSchemaResolveIDCKeyReferences(xmlSchemaIDCPtr idc,
                          xmlSchemaParserCtxtPtr pctxt)
{
    if (idc->type != XML_SCHEMA_TYPE_IDC_KEYREF)
        return(0);
    if (idc->ref->name != NULL) {
        idc->ref->item = (xmlSchemaBasicItemPtr)
            xmlSchemaGetIDC(pctxt->schema, idc->ref->name,
                idc->ref->targetNamespace);
        if (idc->ref->item == NULL) {
            /*
            * TODO: It is actually not an error to fail to resolve
            * at this stage. BUT we need to be that strict!
            */
            xmlSchemaPResCompAttrErr(pctxt,
                XML_SCHEMAP_SRC_RESOLVE,
                WXS_BASIC_CAST idc, idc->node,
                "refer", idc->ref->name,
                idc->ref->targetNamespace,
                XML_SCHEMA_TYPE_IDC_KEY, NULL);
            return(pctxt->err);
        } else if (idc->ref->item->type == XML_SCHEMA_TYPE_IDC_KEYREF) {
            /*
            * SPEC c-props-correct (1)
            */
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                XML_SCHEMAP_C_PROPS_CORRECT,
                NULL, WXS_BASIC_CAST idc,
                "The keyref references a keyref",
                NULL, NULL);
            idc->ref->item = NULL;
            return(pctxt->err);
        } else {
            if (idc->nbFields !=
                ((xmlSchemaIDCPtr) idc->ref->item)->nbFields) {
                xmlChar *str = NULL;
                xmlSchemaIDCPtr refer;
                
                refer = (xmlSchemaIDCPtr) idc->ref->item;
                /*
                * SPEC c-props-correct(2)
                * "If the {identity-constraint category} is keyref,
                * the cardinality of the {fields} must equal that of
                * the {fields} of the {referenced key}.
                */
                xmlSchemaCustomErr(ACTXT_CAST pctxt,
                    XML_SCHEMAP_C_PROPS_CORRECT,
                    NULL, WXS_BASIC_CAST idc,
                    "The cardinality of the keyref differs from the "
                    "cardinality of the referenced key/unique '%s'",
                    xmlSchemaFormatQName(&str, refer->targetNamespace,
                        refer->name),
                    NULL);
                FREE_AND_NULL(str)
                return(pctxt->err);
            }
        }
    }
    return(0);
}

static int
xmlSchemaResolveAttrUseProhibReferences(xmlSchemaAttributeUseProhibPtr prohib,
                                       xmlSchemaParserCtxtPtr pctxt)
{
    if (xmlSchemaGetAttributeDecl(pctxt->schema, prohib->name,
        prohib->targetNamespace) == NULL) {

        xmlSchemaPResCompAttrErr(pctxt,
            XML_SCHEMAP_SRC_RESOLVE,
            NULL, prohib->node,
            "ref", prohib->name, prohib->targetNamespace,
            XML_SCHEMA_TYPE_ATTRIBUTE, NULL);
        return(XML_SCHEMAP_SRC_RESOLVE);
    }
    return(0);
}

#define WXS_REDEFINED_TYPE(c) \
(((xmlSchemaTypePtr) item)->flags & XML_SCHEMAS_TYPE_REDEFINED)

#define WXS_REDEFINED_MODEL_GROUP_DEF(c) \
(((xmlSchemaModelGroupDefPtr) item)->flags & XML_SCHEMA_MODEL_GROUP_DEF_REDEFINED)

#define WXS_REDEFINED_ATTR_GROUP(c) \
(((xmlSchemaAttributeGroupPtr) item)->flags & XML_SCHEMAS_ATTRGROUP_REDEFINED)

static int
xmlSchemaCheckSRCRedefineFirst(xmlSchemaParserCtxtPtr pctxt)
{
    int err = 0;
    xmlSchemaRedefPtr redef = WXS_CONSTRUCTOR(pctxt)->redefs;
    xmlSchemaBasicItemPtr prev, item;
    int wasRedefined;

    if (redef == NULL)
        return(0);      

    do {
        item = redef->item;
        /*
        * First try to locate the redefined component in the
        * schema graph starting with the redefined schema.
        * NOTE: According to this schema bug entry:
        *   http://lists.w3.org/Archives/Public/www-xml-schema-comments/2005OctDec/0019.html
        *   it's not clear if the referenced component needs to originate
        *   from the <redefine>d schema _document_ or the schema; the latter
        *   would include all imported and included sub-schemas of the
        *   <redefine>d schema. Currenlty we latter approach is used.
        *   SUPPLEMENT: It seems that the WG moves towards the latter
        *   approach, so we are doing it right.
        *   
        */
        prev = xmlSchemaFindRedefCompInGraph(
            redef->targetBucket, item->type,
            redef->refName, redef->refTargetNs);
        if (prev == NULL) {
            xmlChar *str = NULL;
            xmlNodePtr node;

            /*
            * SPEC src-redefine:
            * (6.2.1) "The ·actual value· of its own name attribute plus
            * target namespace must successfully ·resolve· to a model
            * group definition in I."
            * (7.2.1) "The ·actual value· of its own name attribute plus
            * target namespace must successfully ·resolve· to an attribute
            * group definition in I."

            *
            * Note that, if we are redefining with the use of references
            * to components, the spec assumes the src-resolve to be used;
            * but this won't assure that we search only *inside* the
            * redefined schema.
            */
            if (redef->reference)
                node = WXS_ITEM_NODE(redef->reference);
            else
                node = WXS_ITEM_NODE(item);
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                /*
                * TODO: error code.
                * Probably XML_SCHEMAP_SRC_RESOLVE, if this is using the
                * reference kind.               
                */
                XML_SCHEMAP_SRC_REDEFINE, node, NULL,
                "The %s '%s' to be redefined could not be found in "
                "the redefined schema",
                WXS_ITEM_TYPE_NAME(item),
                xmlSchemaFormatQName(&str, redef->refTargetNs,
                    redef->refName));
            FREE_AND_NULL(str);     
            err = pctxt->err;
            redef = redef->next;
            continue;
        }
        /*
        * TODO: Obtaining and setting the redefinition state is really
        * clumsy.
        */
        wasRedefined = 0;
        switch (item->type) {
            case XML_SCHEMA_TYPE_COMPLEX:
            case XML_SCHEMA_TYPE_SIMPLE:
                if ((WXS_TYPE_CAST prev)->flags &
                    XML_SCHEMAS_TYPE_REDEFINED)
                {
                    wasRedefined = 1;
                    break;
                }
                /* Mark it as redefined. */
                (WXS_TYPE_CAST prev)->flags |= XML_SCHEMAS_TYPE_REDEFINED;
                /*
                * Assign the redefined type to the
                * base type of the redefining type.
                * TODO: How
                */
                ((xmlSchemaTypePtr) item)->baseType = 
                    (xmlSchemaTypePtr) prev;
                break;
            case XML_SCHEMA_TYPE_GROUP:
                if ((WXS_MODEL_GROUPDEF_CAST prev)->flags &
                    XML_SCHEMA_MODEL_GROUP_DEF_REDEFINED)
                {
                    wasRedefined = 1;
                    break;
                }
                /* Mark it as redefined. */
                (WXS_MODEL_GROUPDEF_CAST prev)->flags |=
                    XML_SCHEMA_MODEL_GROUP_DEF_REDEFINED;
                if (redef->reference != NULL) {
                    /*
                    * Overwrite the QName-reference with the
                    * referenced model group def.
                    */
                    (WXS_PTC_CAST redef->reference)->children =
                        WXS_TREE_CAST prev;
                }
                redef->target = prev;
                break;
            case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
                if ((WXS_ATTR_GROUP_CAST prev)->flags &
                    XML_SCHEMAS_ATTRGROUP_REDEFINED)
                {
                    wasRedefined = 1;
                    break;
                }
                (WXS_ATTR_GROUP_CAST prev)->flags |=
                    XML_SCHEMAS_ATTRGROUP_REDEFINED;
                if (redef->reference != NULL) {
                    /*
                    * Assign the redefined attribute group to the
                    * QName-reference component.
                    * This is the easy case, since we will just
                    * expand the redefined group.
                    */
                    (WXS_QNAME_CAST redef->reference)->item = prev;
                    redef->target = NULL;
                } else {
                    /*
                    * This is the complicated case: we need
                    * to apply src-redefine (7.2.2) at a later
                    * stage, i.e. when attribute group references
                    * have beed expanded and simple types have
                    * beed fixed.
                    */
                    redef->target = prev;
                }
                break;
            default:
                PERROR_INT("xmlSchemaResolveRedefReferences",
                    "Unexpected redefined component type");
                return(-1);     
        }
        if (wasRedefined) {
            xmlChar *str = NULL;
            xmlNodePtr node;

            if (redef->reference)
                node = WXS_ITEM_NODE(redef->reference);
            else
                node = WXS_ITEM_NODE(redef->item);
            
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                /* TODO: error code. */
                XML_SCHEMAP_SRC_REDEFINE,
                node, NULL,
                "The referenced %s was already redefined. Multiple "
                "redefinition of the same component is not supported",
                xmlSchemaGetComponentDesignation(&str, prev),
                NULL);
            FREE_AND_NULL(str)      
            err = pctxt->err;
            redef = redef->next;
            continue;
        }
        redef = redef->next;    
    } while (redef != NULL);

    return(err);
}

static int
xmlSchemaCheckSRCRedefineSecond(xmlSchemaParserCtxtPtr pctxt)
{
    int err = 0;
    xmlSchemaRedefPtr redef = WXS_CONSTRUCTOR(pctxt)->redefs;
    xmlSchemaBasicItemPtr item;

    if (redef == NULL)
        return(0);      

    do {
        if (redef->target == NULL) {
            redef = redef->next;
            continue;
        }
        item = redef->item;
                
        switch (item->type) {
            case XML_SCHEMA_TYPE_SIMPLE:
            case XML_SCHEMA_TYPE_COMPLEX:
                /*
                * Since the spec wants the {name} of the redefined
                * type to be 'absent', we'll NULL it.
                */
                (WXS_TYPE_CAST redef->target)->name = NULL;
                
                /*
                * TODO: Seems like there's nothing more to do. The normal
                * inheritance mechanism is used. But not 100% sure.
                */
                break;
            case XML_SCHEMA_TYPE_GROUP:
                /*
                * URGENT TODO:
                * SPEC src-redefine:
                * (6.2.2) "The {model group} of the model group definition
                * which corresponds to it per XML Representation of Model
                * Group Definition Schema Components (§3.7.2) must be a
                * ·valid restriction· of the {model group} of that model
                * group definition in I, as defined in Particle Valid
                * (Restriction) (§3.9.6)."
                */
                break;
            case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
                /*
                * SPEC src-redefine:
                * (7.2.2) "The {attribute uses} and {attribute wildcard} of
                * the attribute group definition which corresponds to it
                * per XML Representation of Attribute Group Definition Schema
                * Components (§3.6.2) must be ·valid restrictions· of the
                * {attribute uses} and {attribute wildcard} of that attribute
                * group definition in I, as defined in clause 2, clause 3 and
                * clause 4 of Derivation Valid (Restriction, Complex)
                * (§3.4.6) (where references to the base type definition are
                * understood as references to the attribute group definition
                * in I)."
                */
                err = xmlSchemaCheckDerivationOKRestriction2to4(pctxt,
                    XML_SCHEMA_ACTION_REDEFINE,
                    item, redef->target,
                    (WXS_ATTR_GROUP_CAST item)->attrUses,
                    (WXS_ATTR_GROUP_CAST redef->target)->attrUses,
                    (WXS_ATTR_GROUP_CAST item)->attributeWildcard,
                    (WXS_ATTR_GROUP_CAST redef->target)->attributeWildcard);
                if (err == -1)
                    return(-1);
                break;
            default:
                break;
        }
        redef = redef->next;
    } while (redef != NULL);
    return(0);
}
        

static int
xmlSchemaAddComponents(xmlSchemaParserCtxtPtr pctxt,
                       xmlSchemaBucketPtr bucket)
{
    xmlSchemaBasicItemPtr item;
    int err;
    xmlHashTablePtr *table;
    const xmlChar *name;
    int i;

#define WXS_GET_GLOBAL_HASH(c, slot) { \
    if (WXS_IS_BUCKET_IMPMAIN((c)->type)) \
        table = &(WXS_IMPBUCKET((c))->schema->slot); \
    else \
        table = &(WXS_INCBUCKET((c))->ownerImport->schema->slot); }

    /*
    * Add global components to the schema's hash tables.
    * This is the place where duplicate components will be
    * detected.
    * TODO: I think normally we should support imports of the
    *   same namespace from multiple locations. We don't do currently,
    *   but if we do then according to:
    *   http://www.w3.org/Bugs/Public/show_bug.cgi?id=2224
    *   we would need, if imported directly, to import redefined
    *   components as well to be able to catch clashing components.
    *   (I hope I'll still know what this means after some months :-()
    */
    if (bucket == NULL)
        return(-1);
    if (bucket->flags & XML_SCHEMA_BUCKET_COMPS_ADDED)
        return(0);
    bucket->flags |= XML_SCHEMA_BUCKET_COMPS_ADDED; 
    
    for (i = 0; i < bucket->globals->nbItems; i++) {
        item = bucket->globals->items[i];
        table = NULL;
        switch (item->type) {
            case XML_SCHEMA_TYPE_COMPLEX:
            case XML_SCHEMA_TYPE_SIMPLE:
                if (WXS_REDEFINED_TYPE(item))
                    continue;
                name = (WXS_TYPE_CAST item)->name;
                WXS_GET_GLOBAL_HASH(bucket, typeDecl)
                break;
            case XML_SCHEMA_TYPE_ELEMENT:
                name = (WXS_ELEM_CAST item)->name;
                WXS_GET_GLOBAL_HASH(bucket, elemDecl)
                break;
            case XML_SCHEMA_TYPE_ATTRIBUTE:
                name = (WXS_ATTR_CAST item)->name;
                WXS_GET_GLOBAL_HASH(bucket, attrDecl)
                break;
            case XML_SCHEMA_TYPE_GROUP:
                if (WXS_REDEFINED_MODEL_GROUP_DEF(item))
                    continue;
                name = (WXS_MODEL_GROUPDEF_CAST item)->name;
                WXS_GET_GLOBAL_HASH(bucket, groupDecl)
                break;
            case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
                if (WXS_REDEFINED_ATTR_GROUP(item))
                    continue;
                name = (WXS_ATTR_GROUP_CAST item)->name;
                WXS_GET_GLOBAL_HASH(bucket, attrgrpDecl)
                break;
            case XML_SCHEMA_TYPE_IDC_KEY:
            case XML_SCHEMA_TYPE_IDC_UNIQUE:
            case XML_SCHEMA_TYPE_IDC_KEYREF:
                name = (WXS_IDC_CAST item)->name;
                WXS_GET_GLOBAL_HASH(bucket, idcDef)
                break;
            case XML_SCHEMA_TYPE_NOTATION:
                name = ((xmlSchemaNotationPtr) item)->name;
                WXS_GET_GLOBAL_HASH(bucket, notaDecl)
                break;      
            default:
                PERROR_INT("xmlSchemaAddComponents",
                    "Unexpected global component type");
                continue;               
        }       
        if (*table == NULL) {
            *table = xmlHashCreateDict(10, pctxt->dict);
            if (*table == NULL) {
                PERROR_INT("xmlSchemaAddComponents",
                    "failed to create a component hash table");
                return(-1);
            }
        }       
        err = xmlHashAddEntry(*table, name, item);
        if (err != 0) { 
            xmlChar *str = NULL;
            
            xmlSchemaCustomErr(ACTXT_CAST pctxt,
                XML_SCHEMAP_REDEFINED_TYPE,
                WXS_ITEM_NODE(item),
                WXS_BASIC_CAST item,
                "A global %s '%s' does already exist",
                WXS_ITEM_TYPE_NAME(item),
                xmlSchemaGetComponentQName(&str, item));
            FREE_AND_NULL(str);  
        }
    }
    /*
    * Process imported/included schemas.
    */
    if (bucket->relations != NULL) {
        xmlSchemaSchemaRelationPtr rel = bucket->relations;
        do {
            if ((rel->bucket != NULL) &&
                ((rel->bucket->flags & XML_SCHEMA_BUCKET_COMPS_ADDED) == 0)) {
                if (xmlSchemaAddComponents(pctxt, rel->bucket) == -1)
                    return(-1);
            }
            rel = rel->next;
        } while (rel != NULL);
    }
    return(0);
}

static int
xmlSchemaFixupComponents(xmlSchemaParserCtxtPtr pctxt,
                         xmlSchemaBucketPtr rootBucket)
{
    xmlSchemaConstructionCtxtPtr con = pctxt->constructor;
    xmlSchemaTreeItemPtr item, *items;
    int nbItems, i, ret = 0;
    xmlSchemaBucketPtr oldbucket = con->bucket;
    xmlSchemaElementPtr elemDecl;

#define FIXHFAILURE if (pctxt->err == XML_SCHEMAP_INTERNAL) goto exit_failure;

    if ((con->pending == NULL) ||
        (con->pending->nbItems == 0))
        return(0);    

    /*
    * Since xmlSchemaFixupComplexType() will create new particles
    * (local components), and those particle components need a bucket
    * on the constructor, we'll assure here that the constructor has
    * a bucket.
    * TODO: Think about storing locals _only_ on the main bucket.    
    */    
    if (con->bucket == NULL)
        con->bucket = rootBucket;    

    /* TODO:
    * SPEC (src-redefine):
    * (6.2) "If it has no such self-reference, then all of the
    * following must be true:"
    
    * (6.2.2) The {model group} of the model group definition which
    * corresponds to it per XML Representation of Model Group
    * Definition Schema Components (§3.7.2) must be a ·valid
    * restriction· of the {model group} of that model group definition
    * in I, as defined in Particle Valid (Restriction) (§3.9.6)."
    */
    xmlSchemaCheckSRCRedefineFirst(pctxt);

    /*
    * Add global components to the schemata's hash tables.
    */    
    xmlSchemaAddComponents(pctxt, rootBucket);

    pctxt->ctxtType = NULL;
    items = (xmlSchemaTreeItemPtr *) con->pending->items;
    nbItems = con->pending->nbItems;
    /*
    * Now that we have parsed *all* the schema document(s) and converted
    * them to schema components, we can resolve references, apply component
    * constraints, create the FSA from the content model, etc.
    */    
    /*
    * Resolve references of..
    *
    * 1. element declarations:
    *   - the type definition
    *   - the substitution group affiliation
    * 2. simple/complex types:
    *   - the base type definition
    *   - the memberTypes of union types
    *   - the itemType of list types
    * 3. attributes declarations and attribute uses:
    *   - the type definition
    *   - if an attribute use, then the attribute declaration
    * 4. attribute group references:
    *   - the attribute group definition
    * 5. particles:
    *   - the term of the particle (e.g. a model group)
    * 6. IDC key-references:
    *   - the referenced IDC 'key' or 'unique' definition
    * 7. Attribute prohibitions which had a "ref" attribute.
    */        
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_ELEMENT:
                xmlSchemaResolveElementReferences(
                    (xmlSchemaElementPtr) item, pctxt);
                FIXHFAILURE;
                break;
            case XML_SCHEMA_TYPE_COMPLEX:
            case XML_SCHEMA_TYPE_SIMPLE:
                xmlSchemaResolveTypeReferences(
                    (xmlSchemaTypePtr) item, pctxt);
                FIXHFAILURE;
                break;
            case XML_SCHEMA_TYPE_ATTRIBUTE:
                xmlSchemaResolveAttrTypeReferences(
                    (xmlSchemaAttributePtr) item, pctxt);
                FIXHFAILURE;
                break;
            case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
                xmlSchemaResolveAttrUseReferences(
                    (xmlSchemaAttributeUsePtr) item, pctxt);
                FIXHFAILURE;
                break;
            case XML_SCHEMA_EXTRA_QNAMEREF:
                if ((WXS_QNAME_CAST item)->itemType == 
                    XML_SCHEMA_TYPE_ATTRIBUTEGROUP)
                {
                    xmlSchemaResolveAttrGroupReferences(
                        WXS_QNAME_CAST item, pctxt);
                }
                FIXHFAILURE;
                break;
            case XML_SCHEMA_TYPE_SEQUENCE:
            case XML_SCHEMA_TYPE_CHOICE:
            case XML_SCHEMA_TYPE_ALL:
                xmlSchemaResolveModelGroupParticleReferences(pctxt,
                    WXS_MODEL_GROUP_CAST item);
                FIXHFAILURE;
                break;
            case XML_SCHEMA_TYPE_IDC_KEY:
            case XML_SCHEMA_TYPE_IDC_UNIQUE:
            case XML_SCHEMA_TYPE_IDC_KEYREF:
                xmlSchemaResolveIDCKeyReferences(
                    (xmlSchemaIDCPtr) item, pctxt);
                FIXHFAILURE;
                break;
            case XML_SCHEMA_EXTRA_ATTR_USE_PROHIB:
                /*
                * Handle attribue prohibition which had a
                * "ref" attribute.
                */
                xmlSchemaResolveAttrUseProhibReferences(
                    WXS_ATTR_PROHIB_CAST item, pctxt);
                FIXHFAILURE;
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    
    /*
    * Now that all references are resolved we
    * can check for circularity of...
    * 1. the base axis of type definitions 
    * 2. nested model group definitions
    * 3. nested attribute group definitions
    * TODO: check for circual substitution groups.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        /*
        * Let's better stop on the first error here.
        */
        switch (item->type) {
            case XML_SCHEMA_TYPE_COMPLEX:
            case XML_SCHEMA_TYPE_SIMPLE:
                xmlSchemaCheckTypeDefCircular(
                    (xmlSchemaTypePtr) item, pctxt);
                FIXHFAILURE;
                if (pctxt->nberrors != 0)
                    goto exit_error;
                break;
            case XML_SCHEMA_TYPE_GROUP:
                xmlSchemaCheckGroupDefCircular(
                    (xmlSchemaModelGroupDefPtr) item, pctxt);
                FIXHFAILURE;
                if (pctxt->nberrors != 0)
                    goto exit_error;
                break;
            case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
                xmlSchemaCheckAttrGroupCircular(
                    (xmlSchemaAttributeGroupPtr) item, pctxt);
                FIXHFAILURE;
                if (pctxt->nberrors != 0)
                    goto exit_error;
                break;
            default:
                break;
        }       
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    /*
    * Model group definition references:
    * Such a reference is reflected by a particle at the component
    * level. Until now the 'term' of such particles pointed
    * to the model group definition; this was done, in order to
    * ease circularity checks. Now we need to set the 'term' of
    * such particles to the model group of the model group definition.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_SEQUENCE:
            case XML_SCHEMA_TYPE_CHOICE:        
                xmlSchemaModelGroupToModelGroupDefFixup(pctxt,
                    WXS_MODEL_GROUP_CAST item);
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    /*
    * Expand attribute group references of attribute group definitions.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
                if ((! WXS_ATTR_GROUP_EXPANDED(item)) &&
                    WXS_ATTR_GROUP_HAS_REFS(item))
                {
                    xmlSchemaAttributeGroupExpandRefs(pctxt,
                        WXS_ATTR_GROUP_CAST item);
                    FIXHFAILURE;
                }
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    /* 
    * First compute the variety of simple types. This is needed as
    * a separate step, since otherwise we won't be able to detect
    * circular union types in all cases.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_SIMPLE:
                if (WXS_IS_TYPE_NOT_FIXED_1((xmlSchemaTypePtr) item)) {
                    xmlSchemaFixupSimpleTypeStageOne(pctxt,
                        (xmlSchemaTypePtr) item);
                    FIXHFAILURE;
                }
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    /*
    * Detect circular union types. Note that this needs the variety to
    * be already computed.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_SIMPLE:
                if (((xmlSchemaTypePtr) item)->memberTypes != NULL) {
                    xmlSchemaCheckUnionTypeDefCircular(pctxt,   
                        (xmlSchemaTypePtr) item);
                    FIXHFAILURE;
                }
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    
    /*
    * Do the complete type fixup for simple types.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_SIMPLE:
                if (WXS_IS_TYPE_NOT_FIXED(WXS_TYPE_CAST item)) {
                    xmlSchemaFixupSimpleTypeStageTwo(pctxt, WXS_TYPE_CAST item);
                    FIXHFAILURE;
                }
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    /*
    * At this point we need build and check all simple types.
    */
    /*
    * Apply constraints for attribute declarations.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_ATTRIBUTE:             
                xmlSchemaCheckAttrPropsCorrect(pctxt, WXS_ATTR_CAST item);
                FIXHFAILURE;
                break;      
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    /*
    * Apply constraints for attribute uses.
    */    
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
                if (((xmlSchemaAttributeUsePtr)item)->defValue != NULL) {
                    xmlSchemaCheckAttrUsePropsCorrect(pctxt,
                        WXS_ATTR_USE_CAST item);
                    FIXHFAILURE;
                }
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;

    /*
    * Apply constraints for attribute group definitions.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
        case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
            if (( (WXS_ATTR_GROUP_CAST item)->attrUses != NULL) &&
                ( (WXS_LIST_CAST (WXS_ATTR_GROUP_CAST item)->attrUses)->nbItems > 1))
            {
                xmlSchemaCheckAGPropsCorrect(pctxt, WXS_ATTR_GROUP_CAST item);
                FIXHFAILURE;
            }
            break;
        default:
            break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;

    /*
    * Apply constraints for redefinitions.
    */
    if (WXS_CONSTRUCTOR(pctxt)->redefs != NULL)
        xmlSchemaCheckSRCRedefineSecond(pctxt);
    if (pctxt->nberrors != 0)
        goto exit_error;

    /*    
    * Complex types are builded and checked.
    */
    for (i = 0; i < nbItems; i++) {
        item = con->pending->items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_COMPLEX:
                if (WXS_IS_TYPE_NOT_FIXED(WXS_TYPE_CAST item)) {
                    xmlSchemaFixupComplexType(pctxt, WXS_TYPE_CAST item);
                    FIXHFAILURE;
                }
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;

    /*
    * The list could have changed, since xmlSchemaFixupComplexType()
    * will create particles and model groups in some cases.
    */
    items = (xmlSchemaTreeItemPtr *) con->pending->items;
    nbItems = con->pending->nbItems;    
    
    /*
    * Apply some constraints for element declarations.
    */
    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_ELEMENT:
                elemDecl = (xmlSchemaElementPtr) item;
                
                if ((elemDecl->flags & XML_SCHEMAS_ELEM_INTERNAL_CHECKED) == 0)
                {
                    xmlSchemaCheckElementDeclComponent(
                        (xmlSchemaElementPtr) elemDecl, pctxt);
                    FIXHFAILURE;
                }

#ifdef WXS_ELEM_DECL_CONS_ENABLED
                /*
                * Schema Component Constraint: Element Declarations Consistent
                * Apply this constraint to local types of element declarations.
                */
                if ((WXS_ELEM_TYPEDEF(elemDecl) != NULL) &&
                    (WXS_IS_COMPLEX(WXS_ELEM_TYPEDEF(elemDecl))) &&
                    (WXS_TYPE_IS_LOCAL(WXS_ELEM_TYPEDEF(elemDecl))))
                {
                    xmlSchemaCheckElementDeclConsistent(pctxt,
                        WXS_BASIC_CAST elemDecl,
                        WXS_TYPE_PARTICLE(WXS_ELEM_TYPEDEF(elemDecl)),
                        NULL, NULL, 0);
                }
#endif
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
 
    /*
    * Finally we can build the automaton from the content model of
    * complex types.
    */

    for (i = 0; i < nbItems; i++) {
        item = items[i];
        switch (item->type) {
            case XML_SCHEMA_TYPE_COMPLEX:
                xmlSchemaBuildContentModel((xmlSchemaTypePtr) item, pctxt);
                /* FIXHFAILURE; */
                break;
            default:
                break;
        }
    }
    if (pctxt->nberrors != 0)
        goto exit_error;
    /*
    * URGENT TODO: cos-element-consistent
    */        
    goto exit;    

exit_error:    
    ret = pctxt->err;
    goto exit;

exit_failure:
    ret = -1;

exit:
    /*
    * Reset the constructor. This is needed for XSI acquisition, since
    * those items will be processed over and over again for every XSI
    * if not cleared here.
    */
    con->bucket = oldbucket;
    con->pending->nbItems = 0;    
    if (con->substGroups != NULL) {
        xmlHashFree(con->substGroups,
            (xmlHashDeallocator) xmlSchemaSubstGroupFree);
        con->substGroups = NULL;
    }    
    if (con->redefs != NULL) {
        xmlSchemaRedefListFree(con->redefs);
        con->redefs = NULL;
    }
    return(ret);
}
/**
 * xmlSchemaParse:
 * @ctxt:  a schema validation context
 *
 * parse a schema definition resource and build an internal
 * XML Shema struture which can be used to validate instances.
 *
 * Returns the internal XML Schema structure built from the resource or
 *         NULL in case of error
 */
xmlSchemaPtr
xmlSchemaParse(xmlSchemaParserCtxtPtr ctxt)
{
    xmlSchemaPtr mainSchema = NULL;
    xmlSchemaBucketPtr bucket = NULL;
    int res;

    /*
    * This one is used if the schema to be parsed was specified via
    * the API; i.e. not automatically by the validated instance document.
    */

    xmlSchemaInitTypes();

    if (ctxt == NULL)
        return (NULL);

    /* TODO: Init the context. Is this all we need?*/
    ctxt->nberrors = 0;
    ctxt->err = 0;
    ctxt->counter = 0;

    /* Create the *main* schema. */
    mainSchema = xmlSchemaNewSchema(ctxt);
    if (mainSchema == NULL)
        goto exit_failure;
    /*
    * Create the schema constructor.
    */
    if (ctxt->constructor == NULL) {
        ctxt->constructor = xmlSchemaConstructionCtxtCreate(ctxt->dict);
        if (ctxt->constructor == NULL)
            return(NULL);
        /* Take ownership of the constructor to be able to free it. */
        ctxt->ownsConstructor = 1;
    }
    ctxt->constructor->mainSchema = mainSchema;
    /*
    * Locate and add the schema document.
    */
    res = xmlSchemaAddSchemaDoc(ctxt, XML_SCHEMA_SCHEMA_MAIN,
        ctxt->URL, ctxt->doc, ctxt->buffer, ctxt->size, NULL,
        NULL, NULL, &bucket);
    if (res == -1)
        goto exit_failure;
    if (res != 0)
        goto exit;   

    if (bucket == NULL) {
        /* TODO: Error code, actually we failed to *locate* the schema. */
        if (ctxt->URL) 
            xmlSchemaCustomErr(ACTXT_CAST ctxt, XML_SCHEMAP_FAILED_LOAD,
                NULL, NULL,
                "Failed to locate the main schema resource at '%s'",
                ctxt->URL, NULL);
        else
            xmlSchemaCustomErr(ACTXT_CAST ctxt, XML_SCHEMAP_FAILED_LOAD,
                NULL, NULL,
                "Failed to locate the main schema resource",
                    NULL, NULL);
        goto exit;
    }        
    /* Then do the parsing for good. */
    if (xmlSchemaParseNewDocWithContext(ctxt, mainSchema, bucket) == -1)
        goto exit_failure;
    if (ctxt->nberrors != 0)
        goto exit;
    
    mainSchema->doc = bucket->doc;
    mainSchema->preserve = ctxt->preserve;
    
    ctxt->schema = mainSchema;

    if (xmlSchemaFixupComponents(ctxt, WXS_CONSTRUCTOR(ctxt)->mainBucket) == -1)
        goto exit_failure;

    /*
    * TODO: This is not nice, since we cannot distinguish from the
    * result if there was an internal error or not.
    */
exit:       
    if (ctxt->nberrors != 0) {  
        if (mainSchema) {
            xmlSchemaFree(mainSchema);
            mainSchema = NULL;
        }
        if (ctxt->constructor) {
            xmlSchemaConstructionCtxtFree(ctxt->constructor);
            ctxt->constructor = NULL;
            ctxt->ownsConstructor = 0;
        }
    }
    ctxt->schema = NULL;
    return(mainSchema);
exit_failure:
    /* 
    * Quite verbose, but should catch internal errors, which were
    * not communitated.
    */
    if (mainSchema) {
        xmlSchemaFree(mainSchema);
        mainSchema = NULL;
    }
    if (ctxt->constructor) {
        xmlSchemaConstructionCtxtFree(ctxt->constructor);
        ctxt->constructor = NULL;
        ctxt->ownsConstructor = 0;
    }
    PERROR_INT2("xmlSchemaParse",
        "An internal error occured");    
    ctxt->schema = NULL;
    return(NULL);
}

/**
 * xmlSchemaSetParserErrors:
 * @ctxt:  a schema validation context
 * @err:  the error callback
 * @warn:  the warning callback
 * @ctx:  contextual data for the callbacks
 *
 * Set the callback functions used to handle errors for a validation context
 */
void
xmlSchemaSetParserErrors(xmlSchemaParserCtxtPtr ctxt,
                         xmlSchemaValidityErrorFunc err,
                         xmlSchemaValidityWarningFunc warn, void *ctx)
{
    if (ctxt == NULL)
        return;
    ctxt->error = err;
    ctxt->warning = warn;
    ctxt->errCtxt = ctx;
    if (ctxt->vctxt != NULL)
        xmlSchemaSetValidErrors(ctxt->vctxt, err, warn, ctx);
}

/**
 * xmlSchemaSetParserStructuredErrors:
 * @ctxt:  a schema parser context
 * @serror:  the structured error function
 * @ctx: the functions context
 *
 * Set the structured error callback
 */
void
xmlSchemaSetParserStructuredErrors(xmlSchemaParserCtxtPtr ctxt,
                                   xmlStructuredErrorFunc serror,
                                   void *ctx)
{
    if (ctxt == NULL)
        return;
    ctxt->serror = serror;
    ctxt->errCtxt = ctx;
    if (ctxt->vctxt != NULL)
        xmlSchemaSetValidStructuredErrors(ctxt->vctxt, serror, ctx);
}

/**
 * xmlSchemaGetParserErrors:
 * @ctxt:  a XMl-Schema parser context
 * @err: the error callback result
 * @warn: the warning callback result
 * @ctx: contextual data for the callbacks result
 *
 * Get the callback information used to handle errors for a parser context
 *
 * Returns -1 in case of failure, 0 otherwise
 */
int
xmlSchemaGetParserErrors(xmlSchemaParserCtxtPtr ctxt,
                         xmlSchemaValidityErrorFunc * err,
                         xmlSchemaValidityWarningFunc * warn, void **ctx)
{
        if (ctxt == NULL)
                return(-1);
        if (err != NULL)
                *err = ctxt->error;
        if (warn != NULL)
                *warn = ctxt->warning;
        if (ctx != NULL)
                *ctx = ctxt->errCtxt;
        return(0);
}

/**
 * xmlSchemaFacetTypeToString:
 * @type:  the facet type
 *
 * Convert the xmlSchemaTypeType to a char string.
 *
 * Returns the char string representation of the facet type if the
 *     type is a facet and an "Internal Error" string otherwise.
 */
static const xmlChar *
xmlSchemaFacetTypeToString(xmlSchemaTypeType type)
{
    switch (type) {
        case XML_SCHEMA_FACET_PATTERN:
            return (BAD_CAST "pattern");
        case XML_SCHEMA_FACET_MAXEXCLUSIVE:
            return (BAD_CAST "maxExclusive");
        case XML_SCHEMA_FACET_MAXINCLUSIVE:
            return (BAD_CAST "maxInclusive");
        case XML_SCHEMA_FACET_MINEXCLUSIVE:
            return (BAD_CAST "minExclusive");
        case XML_SCHEMA_FACET_MININCLUSIVE:
            return (BAD_CAST "minInclusive");
        case XML_SCHEMA_FACET_WHITESPACE:
            return (BAD_CAST "whiteSpace");
        case XML_SCHEMA_FACET_ENUMERATION:
            return (BAD_CAST "enumeration");
        case XML_SCHEMA_FACET_LENGTH:
            return (BAD_CAST "length");
        case XML_SCHEMA_FACET_MAXLENGTH:
            return (BAD_CAST "maxLength");
        case XML_SCHEMA_FACET_MINLENGTH:
            return (BAD_CAST "minLength");
        case XML_SCHEMA_FACET_TOTALDIGITS:
            return (BAD_CAST "totalDigits");
        case XML_SCHEMA_FACET_FRACTIONDIGITS:
            return (BAD_CAST "fractionDigits");
        default:
            break;
    }
    return (BAD_CAST "Internal Error");
}

static xmlSchemaWhitespaceValueType
xmlSchemaGetWhiteSpaceFacetValue(xmlSchemaTypePtr type)
{
    /*
    * The normalization type can be changed only for types which are derived
    * from xsd:string.
    */
    if (type->type == XML_SCHEMA_TYPE_BASIC) {
        /*
        * Note that we assume a whitespace of preserve for anySimpleType.
        */
        if ((type->builtInType == XML_SCHEMAS_STRING) ||
            (type->builtInType == XML_SCHEMAS_ANYSIMPLETYPE))
            return(XML_SCHEMA_WHITESPACE_PRESERVE);
        else if (type->builtInType == XML_SCHEMAS_NORMSTRING)
            return(XML_SCHEMA_WHITESPACE_REPLACE);
        else {
            /*
            * For all ·atomic· datatypes other than string (and types ·derived·
            * by ·restriction· from it) the value of whiteSpace is fixed to
            * collapse
            * Note that this includes built-in list datatypes.
            */
            return(XML_SCHEMA_WHITESPACE_COLLAPSE);
        }
    } else if (WXS_IS_LIST(type)) {
        /*
        * For list types the facet "whiteSpace" is fixed to "collapse".
        */
        return (XML_SCHEMA_WHITESPACE_COLLAPSE);
    } else if (WXS_IS_UNION(type)) {
        return (XML_SCHEMA_WHITESPACE_UNKNOWN);
    } else if (WXS_IS_ATOMIC(type)) {
        if (type->flags & XML_SCHEMAS_TYPE_WHITESPACE_PRESERVE)
            return (XML_SCHEMA_WHITESPACE_PRESERVE);
        else if (type->flags & XML_SCHEMAS_TYPE_WHITESPACE_REPLACE)
            return (XML_SCHEMA_WHITESPACE_REPLACE);
        else
            return (XML_SCHEMA_WHITESPACE_COLLAPSE);
    }
    return (-1);
}

/************************************************************************
 *                                                                      *
 *                      Simple type validation                          *
 *                                                                      *
 ************************************************************************/


/************************************************************************
 *                                                                      *
 *                      DOM Validation code                             *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSchemaAssembleByLocation:
 * @pctxt:  a schema parser context
 * @vctxt:  a schema validation context
 * @schema: the existing schema
 * @node: the node that fired the assembling
 * @nsName: the namespace name of the new schema
 * @location: the location of the schema
 *
 * Expands an existing schema by an additional schema.
 *
 * Returns 0 if the new schema is correct, a positive error code
 * number otherwise and -1 in case of an internal or API error.
 */
static int
xmlSchemaAssembleByLocation(xmlSchemaValidCtxtPtr vctxt,
                            xmlSchemaPtr schema,
                            xmlNodePtr node,
                            const xmlChar *nsName,
                            const xmlChar *location)
{
    int ret = 0;
    xmlSchemaParserCtxtPtr pctxt;
    xmlSchemaBucketPtr bucket = NULL;

    if ((vctxt == NULL) || (schema == NULL))
        return (-1);

    if (vctxt->pctxt == NULL) {
        VERROR_INT("xmlSchemaAssembleByLocation",
            "no parser context available");
        return(-1);
    }
    pctxt = vctxt->pctxt;
    if (pctxt->constructor == NULL) {
        PERROR_INT("xmlSchemaAssembleByLocation",
            "no constructor");
        return(-1);
    }
    /*
    * Acquire the schema document.
    */
    location = xmlSchemaBuildAbsoluteURI(pctxt->dict,
        location, node);
    /*
    * Note that we pass XML_SCHEMA_SCHEMA_IMPORT here;
    * the process will automatically change this to
    * XML_SCHEMA_SCHEMA_MAIN if it is the first schema document.
    */
    ret = xmlSchemaAddSchemaDoc(pctxt, XML_SCHEMA_SCHEMA_IMPORT,
        location, NULL, NULL, 0, node, NULL, nsName, 
        &bucket);
    if (ret != 0)
        return(ret);    
    if (bucket == NULL) {       
        /*
        * Generate a warning that the document could not be located.
        */
        xmlSchemaCustomWarning(ACTXT_CAST vctxt, XML_SCHEMAV_MISC,
            node, NULL,
            "The document at location '%s' could not be acquired",
            location, NULL, NULL);
        return(ret);
    }
    /*
    * The first located schema will be handled as if all other
    * schemas imported by XSI were imported by this first schema.
    */
    if ((bucket != NULL) &&
        (WXS_CONSTRUCTOR(pctxt)->bucket == NULL))
        WXS_CONSTRUCTOR(pctxt)->bucket = bucket;
    /*
    * TODO: Is this handled like an import? I.e. is it not an error
    * if the schema cannot be located?
    */
    if ((bucket == NULL) || (! CAN_PARSE_SCHEMA(bucket)))
        return(0);
    /*
    * We will reuse the parser context for every schema imported
    * directly via XSI. So reset the context.
    */
    pctxt->nberrors = 0;
    pctxt->err = 0;
    pctxt->doc = bucket->doc;
    
    ret = xmlSchemaParseNewDocWithContext(pctxt, schema, bucket);        
    if (ret == -1) {
        pctxt->doc = NULL;
        goto exit_failure;
    }
    /* Paranoid error channelling. */
    if ((ret == 0) && (pctxt->nberrors != 0))
        ret = pctxt->err;    
    if (pctxt->nberrors == 0) { 
        /* 
        * Only bother to fixup pending components, if there was
        * no error yet.
        * For every XSI acquired schema (and its sub-schemata) we will
        * fixup the components.
        */
        xmlSchemaFixupComponents(pctxt, bucket);
        ret = pctxt->err;
        /*
        * Not nice, but we need somehow to channel the schema parser
        * error to the validation context.
        */
        if ((ret != 0) && (vctxt->err == 0))
            vctxt->err = ret;
        vctxt->nberrors += pctxt->nberrors;
    } else {
        /* Add to validation error sum. */ 
        vctxt->nberrors += pctxt->nberrors;
    }
    pctxt->doc = NULL;
    return(ret);
exit_failure:
    pctxt->doc = NULL;
    return (-1);
}

static xmlSchemaAttrInfoPtr
xmlSchemaGetMetaAttrInfo(xmlSchemaValidCtxtPtr vctxt,                 
                         int metaType)
{
    if (vctxt->nbAttrInfos == 0)
        return (NULL);
    {
        int i;
        xmlSchemaAttrInfoPtr iattr;

        for (i = 0; i < vctxt->nbAttrInfos; i++) {
            iattr = vctxt->attrInfos[i];
            if (iattr->metaType == metaType)
                return (iattr);
        }

    }
    return (NULL);
}

/**
 * xmlSchemaAssembleByXSI:
 * @vctxt:  a schema validation context
 *
 * Expands an existing schema by an additional schema using
 * the xsi:schemaLocation or xsi:noNamespaceSchemaLocation attribute
 * of an instance. If xsi:noNamespaceSchemaLocation is used, @noNamespace
 * must be set to 1.
 *
 * Returns 0 if the new schema is correct, a positive error code
 * number otherwise and -1 in case of an internal or API error.
 */
static int
xmlSchemaAssembleByXSI(xmlSchemaValidCtxtPtr vctxt)
{
    const xmlChar *cur, *end;
    const xmlChar *nsname = NULL, *location;
    int count = 0;
    int ret = 0;
    xmlSchemaAttrInfoPtr iattr;

    /*
    * Parse the value; we will assume an even number of values
    * to be given (this is how Xerces and XSV work).
    *
    * URGENT TODO: !! This needs to work for both
    * @noNamespaceSchemaLocation AND @schemaLocation on the same
    * element !!
    */
    iattr = xmlSchemaGetMetaAttrInfo(vctxt,
        XML_SCHEMA_ATTR_INFO_META_XSI_SCHEMA_LOC);
    if (iattr == NULL)
        iattr = xmlSchemaGetMetaAttrInfo(vctxt,
        XML_SCHEMA_ATTR_INFO_META_XSI_NO_NS_SCHEMA_LOC);
    if (iattr == NULL)
        return (0);
    cur = iattr->value;
    do {
        /*
        * TODO: Move the string parsing mechanism away from here.
        */
        if (iattr->metaType == XML_SCHEMA_ATTR_INFO_META_XSI_SCHEMA_LOC) {
            /*
            * Get the namespace name.
            */
            while (IS_BLANK_CH(*cur))
                cur++;
            end = cur;
            while ((*end != 0) && (!(IS_BLANK_CH(*end))))
                end++;
            if (end == cur)
                break;
            count++; /* TODO: Don't use the schema's dict. */
            nsname = xmlDictLookup(vctxt->schema->dict, cur, end - cur);
            cur = end;
        }
        /*
        * Get the URI.
        */
        while (IS_BLANK_CH(*cur))
            cur++;
        end = cur;
        while ((*end != 0) && (!(IS_BLANK_CH(*end))))
            end++;
        if (end == cur) {
            if (iattr->metaType ==
                XML_SCHEMA_ATTR_INFO_META_XSI_SCHEMA_LOC)
            {
                /*
                * If using @schemaLocation then tuples are expected.
                * I.e. the namespace name *and* the document's URI.
                */              
                xmlSchemaCustomWarning(ACTXT_CAST vctxt, XML_SCHEMAV_MISC,
                    iattr->node, NULL,
                    "The value must consist of tuples: the target namespace "
                    "name and the document's URI", NULL, NULL, NULL);
            }
            break;
        }
        count++; /* TODO: Don't use the schema's dict. */
        location = xmlDictLookup(vctxt->schema->dict, cur, end - cur);
        cur = end;
        ret = xmlSchemaAssembleByLocation(vctxt, vctxt->schema,
            iattr->node, nsname, location);
        if (ret == -1) {
            VERROR_INT("xmlSchemaAssembleByXSI",
                "assembling schemata");
            return (-1);
        }
    } while (*cur != 0);
    return (ret);
}

static const xmlChar *
xmlSchemaLookupNamespace(xmlSchemaValidCtxtPtr vctxt,
                         const xmlChar *prefix)
{
    if (vctxt->sax != NULL) {
        int i, j;
        xmlSchemaNodeInfoPtr inode;
        
        for (i = vctxt->depth; i >= 0; i--) {
            if (vctxt->elemInfos[i]->nbNsBindings != 0) {
                inode = vctxt->elemInfos[i];
                for (j = 0; j < inode->nbNsBindings * 2; j += 2) {
                    if (((prefix == NULL) &&
                            (inode->nsBindings[j] == NULL)) ||
                        ((prefix != NULL) && xmlStrEqual(prefix,
                            inode->nsBindings[j]))) {

                        /*
                        * Note that the namespace bindings are already
                        * in a string dict.
                        */
                        return (inode->nsBindings[j+1]);                        
                    }
                }
            }
        }
        return (NULL);
#ifdef LIBXML_WRITER_ENABLED
    } else if (vctxt->reader != NULL) {
        xmlChar *nsName;
        
        nsName = xmlTextReaderLookupNamespace(vctxt->reader, prefix);
        if (nsName != NULL) {
            const xmlChar *ret;

            ret = xmlDictLookup(vctxt->dict, nsName, -1);
            xmlFree(nsName);
            return (ret);
        } else
            return (NULL);
#endif
    } else {
        xmlNsPtr ns;

        if ((vctxt->inode->node == NULL) ||
            (vctxt->inode->node->doc == NULL)) {
            VERROR_INT("xmlSchemaLookupNamespace",
                "no node or node's doc available");
            return (NULL);
        }
        ns = xmlSearchNs(vctxt->inode->node->doc,
            vctxt->inode->node, prefix);
        if (ns != NULL)
            return (ns->href);
        return (NULL);
    }
}

/*
* This one works on the schema of the validation context.
*/
static int
xmlSchemaValidateNotation(xmlSchemaValidCtxtPtr vctxt,                    
                          xmlSchemaPtr schema,
                          xmlNodePtr node,
                          const xmlChar *value,
                          xmlSchemaValPtr *val,
                          int valNeeded)
{
    int ret;

    if (vctxt && (vctxt->schema == NULL)) {
        VERROR_INT("xmlSchemaValidateNotation",
            "a schema is needed on the validation context");
        return (-1);
    }
    ret = xmlValidateQName(value, 1);
    if (ret != 0)
        return (ret);
    {
        xmlChar *localName = NULL;
        xmlChar *prefix = NULL;

        localName = xmlSplitQName2(value, &prefix);
        if (prefix != NULL) {
            const xmlChar *nsName = NULL;

            if (vctxt != NULL) 
                nsName = xmlSchemaLookupNamespace(vctxt, BAD_CAST prefix);
            else if (node != NULL) {
                xmlNsPtr ns = xmlSearchNs(node->doc, node, prefix);
                if (ns != NULL)
                    nsName = ns->href;
            } else {
                xmlFree(prefix);
                xmlFree(localName);
                return (1);
            }
            if (nsName == NULL) {
                xmlFree(prefix);
                xmlFree(localName);
                return (1);
            }
            if (xmlSchemaGetNotation(schema, localName, nsName) != NULL) {
                if (valNeeded && (val != NULL)) {
                    (*val) = xmlSchemaNewNOTATIONValue(BAD_CAST localName,
                        BAD_CAST xmlStrdup(nsName));
                    if (*val == NULL)
                        ret = -1;
                }
            } else
                ret = 1;
            xmlFree(prefix);
            xmlFree(localName);
        } else {
            if (xmlSchemaGetNotation(schema, value, NULL) != NULL) {
                if (valNeeded && (val != NULL)) {
                    (*val) = xmlSchemaNewNOTATIONValue(
                        BAD_CAST xmlStrdup(value), NULL);
                    if (*val == NULL)
                        ret = -1;
                }
            } else
                return (1);
        }
    }
    return (ret);
}

static int
xmlSchemaVAddNodeQName(xmlSchemaValidCtxtPtr vctxt,
                       const xmlChar* lname,
                       const xmlChar* nsname)
{
    int i;

    lname = xmlDictLookup(vctxt->dict, lname, -1);
    if (lname == NULL)
        return(-1);
    if (nsname != NULL) {
        nsname = xmlDictLookup(vctxt->dict, nsname, -1);
        if (nsname == NULL)
            return(-1);
    }
    for (i = 0; i < vctxt->nodeQNames->nbItems; i += 2) {
        if ((vctxt->nodeQNames->items [i] == lname) &&
            (vctxt->nodeQNames->items[i +1] == nsname))
            /* Already there */
            return(i);
    }
    /* Add new entry. */
    i = vctxt->nodeQNames->nbItems;
    xmlSchemaItemListAdd(vctxt->nodeQNames, (void *) lname);
    xmlSchemaItemListAdd(vctxt->nodeQNames, (void *) nsname);
    return(i);
}

/************************************************************************
 *                                                                      *
 *  Validation of identity-constraints (IDC)                            *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSchemaAugmentIDC:
 * @idcDef: the IDC definition
 *
 * Creates an augmented IDC definition item.
 *
 * Returns the item, or NULL on internal errors.
 */
static void
xmlSchemaAugmentIDC(xmlSchemaIDCPtr idcDef,
                    xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaIDCAugPtr aidc;

    aidc = (xmlSchemaIDCAugPtr) xmlMalloc(sizeof(xmlSchemaIDCAug));
    if (aidc == NULL) {
        xmlSchemaVErrMemory(vctxt,
            "xmlSchemaAugmentIDC: allocating an augmented IDC definition",
            NULL);
        return;
    }
    aidc->keyrefDepth = -1;
    aidc->def = idcDef;
    aidc->next = NULL;
    if (vctxt->aidcs == NULL)
        vctxt->aidcs = aidc;
    else {
        aidc->next = vctxt->aidcs;
        vctxt->aidcs = aidc;
    }
    /*
    * Save if we have keyrefs at all.
    */
    if ((vctxt->hasKeyrefs == 0) &&
        (idcDef->type == XML_SCHEMA_TYPE_IDC_KEYREF))
        vctxt->hasKeyrefs = 1;
}

/**
 * xmlSchemaIDCNewBinding:
 * @idcDef: the IDC definition of this binding
 *
 * Creates a new IDC binding.
 *
 * Returns the new IDC binding, NULL on internal errors.
 */
static xmlSchemaPSVIIDCBindingPtr
xmlSchemaIDCNewBinding(xmlSchemaIDCPtr idcDef)
{
    xmlSchemaPSVIIDCBindingPtr ret;

    ret = (xmlSchemaPSVIIDCBindingPtr) xmlMalloc(
            sizeof(xmlSchemaPSVIIDCBinding));
    if (ret == NULL) {
        xmlSchemaVErrMemory(NULL,
            "allocating a PSVI IDC binding item", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaPSVIIDCBinding));
    ret->definition = idcDef;
    return (ret);
}

/**
 * xmlSchemaIDCStoreNodeTableItem:
 * @vctxt: the WXS validation context
 * @item: the IDC node table item
 *
 * The validation context is used to store IDC node table items.
 * They are stored to avoid copying them if IDC node-tables are merged
 * with corresponding parent IDC node-tables (bubbling).
 *
 * Returns 0 if succeeded, -1 on internal errors.
 */
static int
xmlSchemaIDCStoreNodeTableItem(xmlSchemaValidCtxtPtr vctxt,
                               xmlSchemaPSVIIDCNodePtr item)
{
    /*
    * Add to gobal list.
    */
    if (vctxt->idcNodes == NULL) {
        vctxt->idcNodes = (xmlSchemaPSVIIDCNodePtr *)
            xmlMalloc(20 * sizeof(xmlSchemaPSVIIDCNodePtr));
        if (vctxt->idcNodes == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "allocating the IDC node table item list", NULL);
            return (-1);
        }
        vctxt->sizeIdcNodes = 20;
    } else if (vctxt->sizeIdcNodes <= vctxt->nbIdcNodes) {
        vctxt->sizeIdcNodes *= 2;
        vctxt->idcNodes = (xmlSchemaPSVIIDCNodePtr *)
            xmlRealloc(vctxt->idcNodes, vctxt->sizeIdcNodes *
            sizeof(xmlSchemaPSVIIDCNodePtr));
        if (vctxt->idcNodes == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "re-allocating the IDC node table item list", NULL);
            return (-1);
        }
    }
    vctxt->idcNodes[vctxt->nbIdcNodes++] = item;

    return (0);
}

/**
 * xmlSchemaIDCStoreKey:
 * @vctxt: the WXS validation context
 * @item: the IDC key
 *
 * The validation context is used to store an IDC key.
 *
 * Returns 0 if succeeded, -1 on internal errors.
 */
static int
xmlSchemaIDCStoreKey(xmlSchemaValidCtxtPtr vctxt,
                     xmlSchemaPSVIIDCKeyPtr key)
{
    /*
    * Add to gobal list.
    */
    if (vctxt->idcKeys == NULL) {
        vctxt->idcKeys = (xmlSchemaPSVIIDCKeyPtr *)
            xmlMalloc(40 * sizeof(xmlSchemaPSVIIDCKeyPtr));
        if (vctxt->idcKeys == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "allocating the IDC key storage list", NULL);
            return (-1);
        }
        vctxt->sizeIdcKeys = 40;
    } else if (vctxt->sizeIdcKeys <= vctxt->nbIdcKeys) {
        vctxt->sizeIdcKeys *= 2;
        vctxt->idcKeys = (xmlSchemaPSVIIDCKeyPtr *)
            xmlRealloc(vctxt->idcKeys, vctxt->sizeIdcKeys *
            sizeof(xmlSchemaPSVIIDCKeyPtr));
        if (vctxt->idcKeys == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "re-allocating the IDC key storage list", NULL);
            return (-1);
        }
    }
    vctxt->idcKeys[vctxt->nbIdcKeys++] = key;

    return (0);
}

/**
 * xmlSchemaIDCAppendNodeTableItem:
 * @bind: the IDC binding
 * @ntItem: the node-table item
 *
 * Appends the IDC node-table item to the binding.
 *
 * Returns 0 on success and -1 on internal errors.
 */
static int
xmlSchemaIDCAppendNodeTableItem(xmlSchemaPSVIIDCBindingPtr bind,
                                xmlSchemaPSVIIDCNodePtr ntItem)
{
    if (bind->nodeTable == NULL) {
        bind->sizeNodes = 10;
        bind->nodeTable = (xmlSchemaPSVIIDCNodePtr *)
            xmlMalloc(10 * sizeof(xmlSchemaPSVIIDCNodePtr));
        if (bind->nodeTable == NULL) {
            xmlSchemaVErrMemory(NULL,
                "allocating an array of IDC node-table items", NULL);
            return(-1);
        }
    } else if (bind->sizeNodes <= bind->nbNodes) {
        bind->sizeNodes *= 2;
        bind->nodeTable = (xmlSchemaPSVIIDCNodePtr *)
            xmlRealloc(bind->nodeTable, bind->sizeNodes *
                sizeof(xmlSchemaPSVIIDCNodePtr));
        if (bind->nodeTable == NULL) {
            xmlSchemaVErrMemory(NULL,
                "re-allocating an array of IDC node-table items", NULL);
            return(-1);
        }
    }
    bind->nodeTable[bind->nbNodes++] = ntItem;
    return(0);
}

/**
 * xmlSchemaIDCAcquireBinding:
 * @vctxt: the WXS validation context
 * @matcher: the IDC matcher
 *
 * Looks up an PSVI IDC binding, for the IDC definition and
 * of the given matcher. If none found, a new one is created
 * and added to the IDC table.
 *
 * Returns an IDC binding or NULL on internal errors.
 */
static xmlSchemaPSVIIDCBindingPtr
xmlSchemaIDCAcquireBinding(xmlSchemaValidCtxtPtr vctxt,
                          xmlSchemaIDCMatcherPtr matcher)
{
    xmlSchemaNodeInfoPtr ielem;

    ielem = vctxt->elemInfos[matcher->depth];

    if (ielem->idcTable == NULL) {
        ielem->idcTable = xmlSchemaIDCNewBinding(matcher->aidc->def);
        if (ielem->idcTable == NULL)
            return (NULL);
        return(ielem->idcTable);
    } else {
        xmlSchemaPSVIIDCBindingPtr bind = NULL;

        bind = ielem->idcTable;
        do {
            if (bind->definition == matcher->aidc->def)
                return(bind);
            if (bind->next == NULL) {
                bind->next = xmlSchemaIDCNewBinding(matcher->aidc->def);
                if (bind->next == NULL)
                    return (NULL);
                return(bind->next);
            }
            bind = bind->next;
        } while (bind != NULL);
    }
    return (NULL);
}

static xmlSchemaItemListPtr
xmlSchemaIDCAcquireTargetList(xmlSchemaValidCtxtPtr vctxt ATTRIBUTE_UNUSED,
                             xmlSchemaIDCMatcherPtr matcher)
{
    if (matcher->targets == NULL)
        matcher->targets = xmlSchemaItemListCreate();
    return(matcher->targets);
}

/**
 * xmlSchemaIDCFreeKey:
 * @key: the IDC key
 *
 * Frees an IDC key together with its compiled value.
 */
static void
xmlSchemaIDCFreeKey(xmlSchemaPSVIIDCKeyPtr key)
{
    if (key->val != NULL)
        xmlSchemaFreeValue(key->val);
    xmlFree(key);
}

/**
 * xmlSchemaIDCFreeBinding:
 *
 * Frees an IDC binding. Note that the node table-items
 * are not freed.
 */
static void
xmlSchemaIDCFreeBinding(xmlSchemaPSVIIDCBindingPtr bind)
{
    if (bind->nodeTable != NULL)
        xmlFree(bind->nodeTable);
    if (bind->dupls != NULL)
        xmlSchemaItemListFree(bind->dupls);     
    xmlFree(bind);
}

/**
 * xmlSchemaIDCFreeIDCTable:
 * @bind: the first IDC binding in the list
 *
 * Frees an IDC table, i.e. all the IDC bindings in the list.
 */
static void
xmlSchemaIDCFreeIDCTable(xmlSchemaPSVIIDCBindingPtr bind)
{
    xmlSchemaPSVIIDCBindingPtr prev;

    while (bind != NULL) {
        prev = bind;
        bind = bind->next;
        xmlSchemaIDCFreeBinding(prev);
    }
}

/**
 * xmlSchemaIDCFreeMatcherList:
 * @matcher: the first IDC matcher in the list
 *
 * Frees a list of IDC matchers.
 */
static void
xmlSchemaIDCFreeMatcherList(xmlSchemaIDCMatcherPtr matcher)
{
    xmlSchemaIDCMatcherPtr next;

    while (matcher != NULL) {
        next = matcher->next;
        if (matcher->keySeqs != NULL) {     
            int i;
            for (i = 0; i < matcher->sizeKeySeqs; i++)
                if (matcher->keySeqs[i] != NULL)
                    xmlFree(matcher->keySeqs[i]);
            xmlFree(matcher->keySeqs);      
        }
        if (matcher->targets != NULL) {
            if (matcher->idcType == XML_SCHEMA_TYPE_IDC_KEYREF) {
                int i;
                xmlSchemaPSVIIDCNodePtr idcNode;
                /*
                * Node-table items for keyrefs are not stored globally
                * to the validation context, since they are not bubbled.
                * We need to free them here.
                */
                for (i = 0; i < matcher->targets->nbItems; i++) {
                    idcNode =
                        (xmlSchemaPSVIIDCNodePtr) matcher->targets->items[i];
                    xmlFree(idcNode->keys);
                    xmlFree(idcNode);
                }
            }
            xmlSchemaItemListFree(matcher->targets);
        }
        xmlFree(matcher);
        matcher = next;
    }
}

/**
 * xmlSchemaIDCReleaseMatcherList:
 * @vctxt: the WXS validation context
 * @matcher: the first IDC matcher in the list
 *
 * Caches a list of IDC matchers for reuse.
 */
static void
xmlSchemaIDCReleaseMatcherList(xmlSchemaValidCtxtPtr vctxt,
                               xmlSchemaIDCMatcherPtr matcher)
{
    xmlSchemaIDCMatcherPtr next;

    while (matcher != NULL) {
        next = matcher->next;
        if (matcher->keySeqs != NULL) {     
            int i;
            /*
            * Don't free the array, but only the content.
            */
            for (i = 0; i < matcher->sizeKeySeqs; i++)
                if (matcher->keySeqs[i] != NULL) {
                    xmlFree(matcher->keySeqs[i]);
                    matcher->keySeqs[i] = NULL;
                }
        }
        if (matcher->targets) {
            if (matcher->idcType == XML_SCHEMA_TYPE_IDC_KEYREF) {
                int i;
                xmlSchemaPSVIIDCNodePtr idcNode;
                /*
                * Node-table items for keyrefs are not stored globally
                * to the validation context, since they are not bubbled.
                * We need to free them here.
                */
                for (i = 0; i < matcher->targets->nbItems; i++) {
                    idcNode =
                        (xmlSchemaPSVIIDCNodePtr) matcher->targets->items[i];
                    xmlFree(idcNode->keys);
                    xmlFree(idcNode);
                }
            }
            xmlSchemaItemListFree(matcher->targets);
            matcher->targets = NULL;
        }       
        matcher->next = NULL;
        /*
        * Cache the matcher.
        */
        if (vctxt->idcMatcherCache != NULL)
            matcher->nextCached = vctxt->idcMatcherCache;
        vctxt->idcMatcherCache = matcher;

        matcher = next;
    }
}

/**
 * xmlSchemaIDCAddStateObject:
 * @vctxt: the WXS validation context
 * @matcher: the IDC matcher
 * @sel: the XPath information
 * @parent: the parent "selector" state object if any
 * @type: "selector" or "field"
 *
 * Creates/reuses and activates state objects for the given
 * XPath information; if the XPath expression consists of unions,
 * multiple state objects are created for every unioned expression.
 *
 * Returns 0 on success and -1 on internal errors.
 */
static int
xmlSchemaIDCAddStateObject(xmlSchemaValidCtxtPtr vctxt,
                        xmlSchemaIDCMatcherPtr matcher,
                        xmlSchemaIDCSelectPtr sel,
                        int type)
{
    xmlSchemaIDCStateObjPtr sto;

    /*
    * Reuse the state objects from the pool.
    */
    if (vctxt->xpathStatePool != NULL) {
        sto = vctxt->xpathStatePool;
        vctxt->xpathStatePool = sto->next;
        sto->next = NULL;
    } else {    
        /*
        * Create a new state object.
        */
        sto = (xmlSchemaIDCStateObjPtr) xmlMalloc(sizeof(xmlSchemaIDCStateObj));
        if (sto == NULL) {
            xmlSchemaVErrMemory(NULL,
                "allocating an IDC state object", NULL);
            return (-1);
        }
        memset(sto, 0, sizeof(xmlSchemaIDCStateObj));
    }   
    /*
    * Add to global list. 
    */  
    if (vctxt->xpathStates != NULL)
        sto->next = vctxt->xpathStates;
    vctxt->xpathStates = sto;

    /*
    * Free the old xpath validation context.
    */
    if (sto->xpathCtxt != NULL)
        xmlFreeStreamCtxt((xmlStreamCtxtPtr) sto->xpathCtxt);

    /*
    * Create a new XPath (pattern) validation context.
    */
    sto->xpathCtxt = (void *) xmlPatternGetStreamCtxt(
        (xmlPatternPtr) sel->xpathComp);
    if (sto->xpathCtxt == NULL) {
        VERROR_INT("xmlSchemaIDCAddStateObject",
            "failed to create an XPath validation context");
        return (-1);
    }    
    sto->type = type;
    sto->depth = vctxt->depth;
    sto->matcher = matcher;
    sto->sel = sel;
    sto->nbHistory = 0;
    
#ifdef DEBUG_IDC
    xmlGenericError(xmlGenericErrorContext, "IDC:   STO push '%s'\n",
        sto->sel->xpath);
#endif
    return (0);
}

/**
 * xmlSchemaXPathEvaluate:
 * @vctxt: the WXS validation context
 * @nodeType: the nodeType of the current node
 *
 * Evaluates all active XPath state objects.
 *
 * Returns the number of IC "field" state objects which resolved to
 * this node, 0 if none resolved and -1 on internal errors.
 */
static int
xmlSchemaXPathEvaluate(xmlSchemaValidCtxtPtr vctxt,
                       xmlElementType nodeType)
{
    xmlSchemaIDCStateObjPtr sto, head = NULL, first;
    int res, resolved = 0, depth = vctxt->depth;
        
    if (vctxt->xpathStates == NULL)
        return (0);

    if (nodeType == XML_ATTRIBUTE_NODE)
        depth++;
#ifdef DEBUG_IDC
    {
        xmlChar *str = NULL;
        xmlGenericError(xmlGenericErrorContext, 
            "IDC: EVAL on %s, depth %d, type %d\n",         
            xmlSchemaFormatQName(&str, vctxt->inode->nsName,
                vctxt->inode->localName), depth, nodeType);
        FREE_AND_NULL(str)
    }
#endif
    /*
    * Process all active XPath state objects.
    */
    first = vctxt->xpathStates;
    sto = first;
    while (sto != head) {
#ifdef DEBUG_IDC
        if (sto->type == XPATH_STATE_OBJ_TYPE_IDC_SELECTOR)
            xmlGenericError(xmlGenericErrorContext, "IDC:   ['%s'] selector '%s'\n", 
                sto->matcher->aidc->def->name, sto->sel->xpath);
        else
            xmlGenericError(xmlGenericErrorContext, "IDC:   ['%s'] field '%s'\n", 
                sto->matcher->aidc->def->name, sto->sel->xpath);
#endif
        if (nodeType == XML_ELEMENT_NODE)
            res = xmlStreamPush((xmlStreamCtxtPtr) sto->xpathCtxt,
                vctxt->inode->localName, vctxt->inode->nsName);
        else
            res = xmlStreamPushAttr((xmlStreamCtxtPtr) sto->xpathCtxt,
                vctxt->inode->localName, vctxt->inode->nsName);

        if (res == -1) {
            VERROR_INT("xmlSchemaXPathEvaluate",
                "calling xmlStreamPush()");
            return (-1);
        }
        if (res == 0)
            goto next_sto;
        /*
        * Full match.
        */
#ifdef DEBUG_IDC
        xmlGenericError(xmlGenericErrorContext, "IDC:     "
            "MATCH\n");
#endif
        /*
        * Register a match in the state object history.
        */
        if (sto->history == NULL) {
            sto->history = (int *) xmlMalloc(5 * sizeof(int));
            if (sto->history == NULL) {
                xmlSchemaVErrMemory(NULL, 
                    "allocating the state object history", NULL);
                return(-1);
            }
            sto->sizeHistory = 5;
        } else if (sto->sizeHistory <= sto->nbHistory) {
            sto->sizeHistory *= 2;
            sto->history = (int *) xmlRealloc(sto->history,
                sto->sizeHistory * sizeof(int));
            if (sto->history == NULL) {
                xmlSchemaVErrMemory(NULL, 
                    "re-allocating the state object history", NULL);
                return(-1);
            }
        }               
        sto->history[sto->nbHistory++] = depth;

#ifdef DEBUG_IDC
        xmlGenericError(xmlGenericErrorContext, "IDC:       push match '%d'\n",
            vctxt->depth);
#endif

        if (sto->type == XPATH_STATE_OBJ_TYPE_IDC_SELECTOR) {
            xmlSchemaIDCSelectPtr sel;
            /*
            * Activate state objects for the IDC fields of
            * the IDC selector.
            */
#ifdef DEBUG_IDC
            xmlGenericError(xmlGenericErrorContext, "IDC:     "
                "activating field states\n");
#endif
            sel = sto->matcher->aidc->def->fields;
            while (sel != NULL) {
                if (xmlSchemaIDCAddStateObject(vctxt, sto->matcher,
                    sel, XPATH_STATE_OBJ_TYPE_IDC_FIELD) == -1)
                    return (-1);
                sel = sel->next;
            }
        } else if (sto->type == XPATH_STATE_OBJ_TYPE_IDC_FIELD) {
            /*
            * An IDC key node was found by the IDC field.
            */
#ifdef DEBUG_IDC
            xmlGenericError(xmlGenericErrorContext,
                "IDC:     key found\n");
#endif
            /*
            * Notify that the character value of this node is
            * needed.
            */
            if (resolved == 0) {
                if ((vctxt->inode->flags &
                    XML_SCHEMA_NODE_INFO_VALUE_NEEDED) == 0)
                vctxt->inode->flags |= XML_SCHEMA_NODE_INFO_VALUE_NEEDED;
            }
            resolved++;
        }
next_sto:
        if (sto->next == NULL) {
            /*
            * Evaluate field state objects created on this node as well.
            */
            head = first;
            sto = vctxt->xpathStates;
        } else
            sto = sto->next;
    }
    return (resolved);
}

static const xmlChar *
xmlSchemaFormatIDCKeySequence(xmlSchemaValidCtxtPtr vctxt,
                              xmlChar **buf,
                              xmlSchemaPSVIIDCKeyPtr *seq,
                              int count)
{
    int i, res;
    xmlChar *value = NULL;

    *buf = xmlStrdup(BAD_CAST "[");
    for (i = 0; i < count; i++) {
        *buf = xmlStrcat(*buf, BAD_CAST "'");
        res = xmlSchemaGetCanonValueWhtspExt(seq[i]->val, 
            xmlSchemaGetWhiteSpaceFacetValue(seq[i]->type),
            &value);
        if (res == 0)
            *buf = xmlStrcat(*buf, BAD_CAST value);
        else {
            VERROR_INT("xmlSchemaFormatIDCKeySequence",
                "failed to compute a canonical value");
            *buf = xmlStrcat(*buf, BAD_CAST "???");
        }
        if (i < count -1)
            *buf = xmlStrcat(*buf, BAD_CAST "', ");
        else
            *buf = xmlStrcat(*buf, BAD_CAST "'");
        if (value != NULL) {
            xmlFree(value);
            value = NULL;
        }
    }
    *buf = xmlStrcat(*buf, BAD_CAST "]");

    return (BAD_CAST *buf);
}

/**
 * xmlSchemaXPathPop:
 * @vctxt: the WXS validation context
 *
 * Pops all XPath states.
 *
 * Returns 0 on success and -1 on internal errors.
 */
static int
xmlSchemaXPathPop(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaIDCStateObjPtr sto;
    int res;

    if (vctxt->xpathStates == NULL)
        return(0);
    sto = vctxt->xpathStates;
    do {
        res = xmlStreamPop((xmlStreamCtxtPtr) sto->xpathCtxt);
        if (res == -1)
            return (-1);
        sto = sto->next;
    } while (sto != NULL);
    return(0);
}

/**
 * xmlSchemaXPathProcessHistory:
 * @vctxt: the WXS validation context
 * @type: the simple/complex type of the current node if any at all
 * @val: the precompiled value
 *
 * Processes and pops the history items of the IDC state objects.
 * IDC key-sequences are validated/created on IDC bindings.
 * 
 * Returns 0 on success and -1 on internal errors.
 */
static int
xmlSchemaXPathProcessHistory(xmlSchemaValidCtxtPtr vctxt,
                             int depth)
{
    xmlSchemaIDCStateObjPtr sto, nextsto;
    int res, matchDepth;
    xmlSchemaPSVIIDCKeyPtr key = NULL;
    xmlSchemaTypePtr type = vctxt->inode->typeDef, simpleType = NULL;

    if (vctxt->xpathStates == NULL)
        return (0);
    sto = vctxt->xpathStates;

#ifdef DEBUG_IDC
    {
        xmlChar *str = NULL;
        xmlGenericError(xmlGenericErrorContext, 
            "IDC: BACK on %s, depth %d\n",
            xmlSchemaFormatQName(&str, vctxt->inode->nsName,
                vctxt->inode->localName), vctxt->depth);
        FREE_AND_NULL(str)
    }
#endif    
    /*
    * Evaluate the state objects.
    */
    while (sto != NULL) {
        res = xmlStreamPop((xmlStreamCtxtPtr) sto->xpathCtxt);
        if (res == -1) {
            VERROR_INT("xmlSchemaXPathProcessHistory",
                "calling xmlStreamPop()");
            return (-1);
        }
#ifdef DEBUG_IDC
        xmlGenericError(xmlGenericErrorContext, "IDC:   stream pop '%s'\n",
            sto->sel->xpath);
#endif
        if (sto->nbHistory == 0)
            goto deregister_check;

        matchDepth = sto->history[sto->nbHistory -1];

        /*
        * Only matches at the current depth are of interest.
        */
        if (matchDepth != depth) {
            sto = sto->next;
            continue;
        }       
        if (sto->type == XPATH_STATE_OBJ_TYPE_IDC_FIELD) {
            /*
            * NOTE: According to
            *   http://www.w3.org/Bugs/Public/show_bug.cgi?id=2198
            *   ... the simple-content of complex types is also allowed.
            */
            
            if (WXS_IS_COMPLEX(type)) {
                if (WXS_HAS_SIMPLE_CONTENT(type)) {
                    /*
                    * Sanity check for complex types with simple content.
                    */
                    simpleType = type->contentTypeDef;
                    if (simpleType == NULL) {
                        VERROR_INT("xmlSchemaXPathProcessHistory",
                            "field resolves to a CT with simple content "
                            "but the CT is missing the ST definition");
                        return (-1);
                    }
                } else
                    simpleType = NULL;
            } else 
                simpleType = type;
            if (simpleType == NULL) {
                xmlChar *str = NULL;
        
                /*
                * Not qualified if the field resolves to a node of non
                * simple type.
                */      
                xmlSchemaCustomErr(ACTXT_CAST vctxt,
                    XML_SCHEMAV_CVC_IDC, NULL,              
                    WXS_BASIC_CAST sto->matcher->aidc->def,
                    "The XPath '%s' of a field of %s does evaluate to a node of "
                    "non-simple type",
                    sto->sel->xpath,
                    xmlSchemaGetIDCDesignation(&str, sto->matcher->aidc->def));
                FREE_AND_NULL(str);
                sto->nbHistory--;
                goto deregister_check;
            }
            
            if ((key == NULL) && (vctxt->inode->val == NULL)) {
                /*
                * Failed to provide the normalized value; maybe
                * the value was invalid.
                */
                VERROR(XML_SCHEMAV_CVC_IDC,
                    WXS_BASIC_CAST sto->matcher->aidc->def,
                    "Warning: No precomputed value available, the value "
                    "was either invalid or something strange happend");
                sto->nbHistory--;
                goto deregister_check;
            } else {
                xmlSchemaIDCMatcherPtr matcher = sto->matcher;
                xmlSchemaPSVIIDCKeyPtr *keySeq;
                int pos, idx;
                
                /*
                * The key will be anchored on the matcher's list of
                * key-sequences. The position in this list is determined
                * by the target node's depth relative to the matcher's
                * depth of creation (i.e. the depth of the scope element).
                * 
                * Element        Depth    Pos   List-entries
                * <scope>          0              NULL
                *   <bar>          1              NULL
                *     <target/>    2       2      target
                *   <bar>
                * </scope>
                *
                * The size of the list is only dependant on the depth of
                * the tree.
                * An entry will be NULLed in selector_leave, i.e. when
                * we hit the target's 
                */                  
                pos = sto->depth - matcher->depth;
                idx = sto->sel->index;
                
                /*
                * Create/grow the array of key-sequences.
                */
                if (matcher->keySeqs == NULL) {
                    if (pos > 9) 
                        matcher->sizeKeySeqs = pos * 2;
                    else
                        matcher->sizeKeySeqs = 10;
                    matcher->keySeqs = (xmlSchemaPSVIIDCKeyPtr **) 
                        xmlMalloc(matcher->sizeKeySeqs *
                        sizeof(xmlSchemaPSVIIDCKeyPtr *));                      
                    if (matcher->keySeqs == NULL) {             
                        xmlSchemaVErrMemory(NULL,
                            "allocating an array of key-sequences",
                            NULL);
                        return(-1);
                    }
                    memset(matcher->keySeqs, 0,
                        matcher->sizeKeySeqs *
                        sizeof(xmlSchemaPSVIIDCKeyPtr *));
                } else if (pos >= matcher->sizeKeySeqs) {       
                    int i = matcher->sizeKeySeqs;
                    
                    matcher->sizeKeySeqs *= 2;
                    matcher->keySeqs = (xmlSchemaPSVIIDCKeyPtr **)
                        xmlRealloc(matcher->keySeqs,
                        matcher->sizeKeySeqs *
                        sizeof(xmlSchemaPSVIIDCKeyPtr *));
                    if (matcher->keySeqs == NULL) {
                        xmlSchemaVErrMemory(NULL,
                            "reallocating an array of key-sequences",
                            NULL);
                        return (-1);
                    }
                    /*
                    * The array needs to be NULLed.
                    * TODO: Use memset?
                    */
                    for (; i < matcher->sizeKeySeqs; i++) 
                        matcher->keySeqs[i] = NULL;                     
                }
                
                /*
                * Get/create the key-sequence.
                */
                keySeq = matcher->keySeqs[pos];             
                if (keySeq == NULL) {   
                    goto create_sequence;
                } else if (keySeq[idx] != NULL) {
                    xmlChar *str = NULL;
                    /*
                    * cvc-identity-constraint:
                    * 3 For each node in the ·target node set· all
                    * of the {fields}, with that node as the context
                    * node, evaluate to either an empty node-set or
                    * a node-set with exactly one member, which must
                    * have a simple type.
                    * 
                    * The key was already set; report an error.
                    */
                    xmlSchemaCustomErr(ACTXT_CAST vctxt, 
                        XML_SCHEMAV_CVC_IDC, NULL,
                        WXS_BASIC_CAST matcher->aidc->def,
                        "The XPath '%s' of a field of %s evaluates to a "
                        "node-set with more than one member",
                        sto->sel->xpath,
                        xmlSchemaGetIDCDesignation(&str, matcher->aidc->def));
                    FREE_AND_NULL(str);
                    sto->nbHistory--;
                    goto deregister_check;
                } else
                    goto create_key;            
                
create_sequence:
                /*
                * Create a key-sequence.
                */
                keySeq = (xmlSchemaPSVIIDCKeyPtr *) xmlMalloc(
                    matcher->aidc->def->nbFields * 
                    sizeof(xmlSchemaPSVIIDCKeyPtr));
                if (keySeq == NULL) {
                    xmlSchemaVErrMemory(NULL, 
                        "allocating an IDC key-sequence", NULL);
                    return(-1);                 
                }       
                memset(keySeq, 0, matcher->aidc->def->nbFields * 
                    sizeof(xmlSchemaPSVIIDCKeyPtr));
                matcher->keySeqs[pos] = keySeq;
create_key:
                /*
                * Create a key once per node only.
                */  
                if (key == NULL) {
                    key = (xmlSchemaPSVIIDCKeyPtr) xmlMalloc(
                        sizeof(xmlSchemaPSVIIDCKey));
                    if (key == NULL) {
                        xmlSchemaVErrMemory(NULL,
                            "allocating a IDC key", NULL);
                        xmlFree(keySeq);
                        matcher->keySeqs[pos] = NULL;
                        return(-1);                     
                    }
                    /*
                    * Consume the compiled value.
                    */
                    key->type = simpleType;
                    key->val = vctxt->inode->val;
                    vctxt->inode->val = NULL;
                    /*
                    * Store the key in a global list.
                    */
                    if (xmlSchemaIDCStoreKey(vctxt, key) == -1) {
                        xmlSchemaIDCFreeKey(key);
                        return (-1);
                    }
                }
                keySeq[idx] = key;                  
            }
        } else if (sto->type == XPATH_STATE_OBJ_TYPE_IDC_SELECTOR) {
                
            xmlSchemaPSVIIDCKeyPtr **keySeq = NULL;
            /* xmlSchemaPSVIIDCBindingPtr bind; */
            xmlSchemaPSVIIDCNodePtr ntItem;
            xmlSchemaIDCMatcherPtr matcher;
            xmlSchemaIDCPtr idc;
            xmlSchemaItemListPtr targets;
            int pos, i, j, nbKeys;
            /*
            * Here we have the following scenario:
            * An IDC 'selector' state object resolved to a target node,
            * during the time this target node was in the 
            * ancestor-or-self axis, the 'field' state object(s) looked 
            * out for matching nodes to create a key-sequence for this 
            * target node. Now we are back to this target node and need
            * to put the key-sequence, together with the target node 
            * itself, into the node-table of the corresponding IDC 
            * binding.
            */
            matcher = sto->matcher;
            idc = matcher->aidc->def;
            nbKeys = idc->nbFields;
            pos = depth - matcher->depth;               
            /*
            * Check if the matcher has any key-sequences at all, plus
            * if it has a key-sequence for the current target node.
            */          
            if ((matcher->keySeqs == NULL) ||
                (matcher->sizeKeySeqs <= pos)) {
                if (idc->type == XML_SCHEMA_TYPE_IDC_KEY)
                    goto selector_key_error;
                else
                    goto selector_leave;
            }
            
            keySeq = &(matcher->keySeqs[pos]);          
            if (*keySeq == NULL) {
                if (idc->type == XML_SCHEMA_TYPE_IDC_KEY)
                    goto selector_key_error;
                else
                    goto selector_leave;
            }
            
            for (i = 0; i < nbKeys; i++) {
                if ((*keySeq)[i] == NULL) {
                    /*
                    * Not qualified, if not all fields did resolve.
                    */
                    if (idc->type == XML_SCHEMA_TYPE_IDC_KEY) {
                        /*
                        * All fields of a "key" IDC must resolve.
                        */
                        goto selector_key_error;
                    }               
                    goto selector_leave;
                }
            }
            /*
            * All fields did resolve.
            */
            
            /*
            * 4.1 If the {identity-constraint category} is unique(/key),
            * then no two members of the ·qualified node set· have
            * ·key-sequences· whose members are pairwise equal, as
            * defined by Equal in [XML Schemas: Datatypes].
            *
            * Get the IDC binding from the matcher and check for
            * duplicate key-sequences.
            */
#if 0
            bind = xmlSchemaIDCAcquireBinding(vctxt, matcher);
#endif
            targets = xmlSchemaIDCAcquireTargetList(vctxt, matcher);
            if ((idc->type != XML_SCHEMA_TYPE_IDC_KEYREF) && 
                (targets->nbItems != 0)) {
                xmlSchemaPSVIIDCKeyPtr ckey, bkey, *bkeySeq;
                
                i = 0;
                res = 0;
                /*
                * Compare the key-sequences, key by key.
                */
                do {
                    bkeySeq =
                        ((xmlSchemaPSVIIDCNodePtr) targets->items[i])->keys;
                    for (j = 0; j < nbKeys; j++) {
                        ckey = (*keySeq)[j];
                        bkey = bkeySeq[j];                                                      
                        res = xmlSchemaAreValuesEqual(ckey->val, bkey->val);
                        if (res == -1) {
                            return (-1);
                        } else if (res == 0) {
                            /*
                            * One of the keys differs, so the key-sequence
                            * won't be equal; get out.
                            */
                            break;
                        }
                    }
                    if (res == 1) {
                        /*
                        * Duplicate key-sequence found.
                        */
                        break;
                    }
                    i++;
                } while (i < targets->nbItems);
                if (i != targets->nbItems) {
                    xmlChar *str = NULL, *strB = NULL;
                    /*   
                    * TODO: Try to report the key-sequence.
                    */
                    xmlSchemaCustomErr(ACTXT_CAST vctxt, 
                        XML_SCHEMAV_CVC_IDC, NULL,
                        WXS_BASIC_CAST idc,
                        "Duplicate key-sequence %s in %s",
                        xmlSchemaFormatIDCKeySequence(vctxt, &str,
                            (*keySeq), nbKeys),
                        xmlSchemaGetIDCDesignation(&strB, idc));
                    FREE_AND_NULL(str);
                    FREE_AND_NULL(strB);
                    goto selector_leave;
                }
            }
            /*
            * Add a node-table item to the IDC binding.
            */
            ntItem = (xmlSchemaPSVIIDCNodePtr) xmlMalloc(
                sizeof(xmlSchemaPSVIIDCNode));
            if (ntItem == NULL) {
                xmlSchemaVErrMemory(NULL, 
                    "allocating an IDC node-table item", NULL);
                xmlFree(*keySeq);
                *keySeq = NULL;
                return(-1);
            }   
            memset(ntItem, 0, sizeof(xmlSchemaPSVIIDCNode));
            
            /* 
            * Store the node-table item in a global list.
            */
            if (idc->type != XML_SCHEMA_TYPE_IDC_KEYREF) {
                if (xmlSchemaIDCStoreNodeTableItem(vctxt, ntItem) == -1) {
                    xmlFree(ntItem);
                    xmlFree(*keySeq);
                    *keySeq = NULL;
                    return (-1);
                }
                ntItem->nodeQNameID = -1;
            } else {
                /*
                * Save a cached QName for this node on the IDC node, to be
                * able to report it, even if the node is not saved.
                */
                ntItem->nodeQNameID = xmlSchemaVAddNodeQName(vctxt,
                    vctxt->inode->localName, vctxt->inode->nsName);
                if (ntItem->nodeQNameID == -1) {
                    xmlFree(ntItem);
                    xmlFree(*keySeq);
                    *keySeq = NULL;
                    return (-1);                    
                }
            }
            /*
            * Init the node-table item: Save the node, position and
            * consume the key-sequence.
            */
            ntItem->node = vctxt->node;
            ntItem->nodeLine = vctxt->inode->nodeLine;
            ntItem->keys = *keySeq;
            *keySeq = NULL;
#if 0
            if (xmlSchemaIDCAppendNodeTableItem(bind, ntItem) == -1) {
#endif
            if (xmlSchemaItemListAdd(targets, ntItem) == -1) {
                if (idc->type == XML_SCHEMA_TYPE_IDC_KEYREF) {
                    /* 
                    * Free the item, since keyref items won't be
                    * put on a global list.
                    */
                    xmlFree(ntItem->keys);
                    xmlFree(ntItem);
                }
                return (-1);
            }
            
            goto selector_leave;
selector_key_error:
            {
                xmlChar *str = NULL;
                /*
                * 4.2.1 (KEY) The ·target node set· and the 
                * ·qualified node set· are equal, that is, every 
                * member of the ·target node set· is also a member
                * of the ·qualified node set· and vice versa.
                */
                xmlSchemaCustomErr(ACTXT_CAST vctxt, 
                    XML_SCHEMAV_CVC_IDC, NULL,
                    WXS_BASIC_CAST idc,
                    "Not all fields of %s evaluate to a node",
                    xmlSchemaGetIDCDesignation(&str, idc), NULL);
                FREE_AND_NULL(str);
            }
selector_leave:
            /*
            * Free the key-sequence if not added to the IDC table.
            */
            if ((keySeq != NULL) && (*keySeq != NULL)) {
                xmlFree(*keySeq);
                *keySeq = NULL;
            }
        } /* if selector */
        
        sto->nbHistory--;

deregister_check:
        /*
        * Deregister state objects if they reach the depth of creation.
        */
        if ((sto->nbHistory == 0) && (sto->depth == depth)) {
#ifdef DEBUG_IDC
            xmlGenericError(xmlGenericErrorContext, "IDC:   STO pop '%s'\n",
                sto->sel->xpath);
#endif
            if (vctxt->xpathStates != sto) {
                VERROR_INT("xmlSchemaXPathProcessHistory",
                    "The state object to be removed is not the first "
                    "in the list");
            }
            nextsto = sto->next;
            /*
            * Unlink from the list of active XPath state objects.
            */
            vctxt->xpathStates = sto->next;
            sto->next = vctxt->xpathStatePool;
            /*
            * Link it to the pool of reusable state objects.
            */
            vctxt->xpathStatePool = sto;
            sto = nextsto;
        } else
            sto = sto->next;
    } /* while (sto != NULL) */
    return (0);
}

/**
 * xmlSchemaIDCRegisterMatchers:
 * @vctxt: the WXS validation context
 * @elemDecl: the element declaration
 *
 * Creates helper objects to evaluate IDC selectors/fields
 * successively.
 *
 * Returns 0 if OK and -1 on internal errors.
 */
static int
xmlSchemaIDCRegisterMatchers(xmlSchemaValidCtxtPtr vctxt,
                             xmlSchemaElementPtr elemDecl)
{
    xmlSchemaIDCMatcherPtr matcher, last = NULL;
    xmlSchemaIDCPtr idc, refIdc;
    xmlSchemaIDCAugPtr aidc;
        
    idc = (xmlSchemaIDCPtr) elemDecl->idcs;
    if (idc == NULL)
        return (0);
    
#ifdef DEBUG_IDC
    {
        xmlChar *str = NULL;
        xmlGenericError(xmlGenericErrorContext, 
            "IDC: REGISTER on %s, depth %d\n",
            (char *) xmlSchemaFormatQName(&str, vctxt->inode->nsName,
                vctxt->inode->localName), vctxt->depth);
        FREE_AND_NULL(str)
    }
#endif
    if (vctxt->inode->idcMatchers != NULL) {
        VERROR_INT("xmlSchemaIDCRegisterMatchers",
            "The chain of IDC matchers is expected to be empty");
        return (-1);
    }
    do {
        if (idc->type == XML_SCHEMA_TYPE_IDC_KEYREF) {
            /*
            * Since IDCs bubbles are expensive we need to know the
            * depth at which the bubbles should stop; this will be
            * the depth of the top-most keyref IDC. If no keyref
            * references a key/unique IDC, the keyrefDepth will
            * be -1, indicating that no bubbles are needed.
            */
            refIdc = (xmlSchemaIDCPtr) idc->ref->item;
            if (refIdc != NULL) {
                /*
                * Remember that we have keyrefs on this node.
                */
                vctxt->inode->hasKeyrefs = 1;
                /*
                * Lookup the referenced augmented IDC info.
                */
                aidc = vctxt->aidcs;
                while (aidc != NULL) {
                    if (aidc->def == refIdc)
                        break;
                    aidc = aidc->next;
                }
                if (aidc == NULL) {
                    VERROR_INT("xmlSchemaIDCRegisterMatchers",
                        "Could not find an augmented IDC item for an IDC "
                        "definition");
                    return (-1);
                }               
                if ((aidc->keyrefDepth == -1) ||
                    (vctxt->depth < aidc->keyrefDepth))
                    aidc->keyrefDepth = vctxt->depth;
            }
        }
        /*
        * Lookup the augmented IDC item for the IDC definition.
        */
        aidc = vctxt->aidcs;
        while (aidc != NULL) {
            if (aidc->def == idc)
                break;
            aidc = aidc->next;
        }
        if (aidc == NULL) {
            VERROR_INT("xmlSchemaIDCRegisterMatchers",
                "Could not find an augmented IDC item for an IDC definition");
            return (-1);
        }
        /*
        * Create an IDC matcher for every IDC definition.
        */
        if (vctxt->idcMatcherCache != NULL) {
            /*
            * Reuse a cached matcher.
            */
            matcher = vctxt->idcMatcherCache;
            vctxt->idcMatcherCache = matcher->nextCached;
            matcher->nextCached = NULL;
        } else {
            matcher = (xmlSchemaIDCMatcherPtr) 
                xmlMalloc(sizeof(xmlSchemaIDCMatcher));
            if (matcher == NULL) {
                xmlSchemaVErrMemory(vctxt, 
                    "allocating an IDC matcher", NULL);
                return (-1);
            }
            memset(matcher, 0, sizeof(xmlSchemaIDCMatcher));
        }
        if (last == NULL)
            vctxt->inode->idcMatchers = matcher;
        else
            last->next = matcher;
        last = matcher;

        matcher->type = IDC_MATCHER;
        matcher->depth = vctxt->depth;  
        matcher->aidc = aidc;
        matcher->idcType = aidc->def->type;
#ifdef DEBUG_IDC        
        xmlGenericError(xmlGenericErrorContext, "IDC:   register matcher\n");
#endif 
        /*
        * Init the automaton state object. 
        */
        if (xmlSchemaIDCAddStateObject(vctxt, matcher, 
            idc->selector, XPATH_STATE_OBJ_TYPE_IDC_SELECTOR) == -1)
            return (-1);

        idc = idc->next;
    } while (idc != NULL);
    return (0);
}

static int
xmlSchemaIDCFillNodeTables(xmlSchemaValidCtxtPtr vctxt,
                           xmlSchemaNodeInfoPtr ielem)
{
    xmlSchemaPSVIIDCBindingPtr bind;
    int res, i, j, k, nbTargets, nbFields, nbDupls, nbNodeTable;
    xmlSchemaPSVIIDCKeyPtr *keys, *ntkeys;
    xmlSchemaPSVIIDCNodePtr *targets, *dupls;
    
    xmlSchemaIDCMatcherPtr matcher = ielem->idcMatchers;
    /* vctxt->createIDCNodeTables */
    while (matcher != NULL) {
        /*
        * Skip keyref IDCs and empty IDC target-lists.
        */
        if ((matcher->aidc->def->type == XML_SCHEMA_TYPE_IDC_KEYREF) ||
            WXS_ILIST_IS_EMPTY(matcher->targets))
        {
            matcher = matcher->next;
            continue;
        }
        /*
        * If we _want_ the IDC node-table to be created in any case
        * then do so. Otherwise create them only if keyrefs need them.
        */
        if ((! vctxt->createIDCNodeTables) &&
            ((matcher->aidc->keyrefDepth == -1) ||
             (matcher->aidc->keyrefDepth > vctxt->depth)))
        {
            matcher = matcher->next;
            continue;
        }
        /*
        * Get/create the IDC binding on this element for the IDC definition.
        */
        bind = xmlSchemaIDCAcquireBinding(vctxt, matcher);

        if (! WXS_ILIST_IS_EMPTY(bind->dupls)) {
            dupls = (xmlSchemaPSVIIDCNodePtr *) bind->dupls->items;
            nbDupls = bind->dupls->nbItems;
        } else {
            dupls = NULL;
            nbDupls = 0;            
        }
        if (bind->nodeTable != NULL) {
            nbNodeTable = bind->nbNodes;
        } else {
            nbNodeTable = 0;
        }

        if ((nbNodeTable == 0) && (nbDupls == 0)) {
            /*
            * Transfer all IDC target-nodes to the IDC node-table.
            */
            bind->nodeTable =
                (xmlSchemaPSVIIDCNodePtr *) matcher->targets->items;            
            bind->sizeNodes = matcher->targets->sizeItems;
            bind->nbNodes = matcher->targets->nbItems;

            matcher->targets->items = NULL;
            matcher->targets->sizeItems = 0;
            matcher->targets->nbItems = 0;          
        } else {
            /*
            * Compare the key-sequences and add to the IDC node-table.
            */
            nbTargets = matcher->targets->nbItems;
            targets = (xmlSchemaPSVIIDCNodePtr *) matcher->targets->items;      
            nbFields = matcher->aidc->def->nbFields;
            i = 0;
            do {
                keys = targets[i]->keys;
                if (nbDupls) {                  
                    /*
                    * Search in already found duplicates first.
                    */
                    j = 0;
                    do {                                                
                        if (nbFields == 1) {
                            res = xmlSchemaAreValuesEqual(keys[0]->val,
                                dupls[j]->keys[0]->val);
                            if (res == -1)
                                goto internal_error;
                            if (res == 1) {
                                /*
                                * Equal key-sequence.
                                */
                                goto next_target;
                            }
                        } else {
                            res = 0;
                            ntkeys = dupls[j]->keys;
                            for (k = 0; k < nbFields; k++) {
                                res = xmlSchemaAreValuesEqual(keys[k]->val,
                                    ntkeys[k]->val);
                                if (res == -1)
                                    goto internal_error;
                                if (res == 0) {
                                    /*
                                    * One of the keys differs.
                                    */
                                    break;
                                }
                            }
                            if (res == 1) {
                                /*
                                * Equal key-sequence found.
                                */
                                goto next_target;
                            }
                        }
                        j++;
                    } while (j < nbDupls);                  
                }
                if (nbNodeTable) {
                    j = 0;
                    do {                                                
                        if (nbFields == 1) {
                            res = xmlSchemaAreValuesEqual(keys[0]->val,
                                bind->nodeTable[j]->keys[0]->val);
                            if (res == -1)
                                goto internal_error;
                            if (res == 0) {
                                /*
                                * The key-sequence differs.
                                */
                                goto next_node_table_entry;
                            }
                        } else {
                            res = 0;
                            ntkeys = bind->nodeTable[j]->keys;
                            for (k = 0; k < nbFields; k++) {
                                res = xmlSchemaAreValuesEqual(keys[k]->val,
                                    ntkeys[k]->val);
                                if (res == -1)
                                    goto internal_error;
                                if (res == 0) {
                                    /*
                                    * One of the keys differs.
                                    */
                                    goto next_node_table_entry;
                                }
                            }
                        }                       
                        /*
                        * Add the duplicate to the list of duplicates.
                        */
                        if (bind->dupls == NULL) {
                            bind->dupls = xmlSchemaItemListCreate();
                            if (bind->dupls == NULL)
                                goto internal_error;
                        }                   
                        if (xmlSchemaItemListAdd(bind->dupls, bind->nodeTable[j]) == -1)
                            goto internal_error;
                        /*
                        * Remove the duplicate entry from the IDC node-table.
                        */
                        bind->nodeTable[j] = bind->nodeTable[bind->nbNodes -1];
                        bind->nbNodes--;

                        goto next_target;

next_node_table_entry:
                        j++;
                    } while (j < nbNodeTable);
                }
                /*
                * If everything is fine, then add the IDC target-node to
                * the IDC node-table.
                */
                if (xmlSchemaIDCAppendNodeTableItem(bind, targets[i]) == -1)
                    goto internal_error;

next_target:
                i++;
            } while (i < nbTargets);
        }
        matcher = matcher->next;
    }
    return(0);

internal_error:
    return(-1);
}

/**
 * xmlSchemaBubbleIDCNodeTables: 
 * @depth: the current tree depth
 *
 * Merges IDC bindings of an element at @depth into the corresponding IDC 
 * bindings of its parent element. If a duplicate note-table entry is found, 
 * both, the parent node-table entry and child entry are discarded from the 
 * node-table of the parent.
 *
 * Returns 0 if OK and -1 on internal errors.
 */
static int
xmlSchemaBubbleIDCNodeTables(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaPSVIIDCBindingPtr bind; /* IDC bindings of the current node. */
    xmlSchemaPSVIIDCBindingPtr *parTable, parBind = NULL; /* parent IDC bindings. */
    xmlSchemaPSVIIDCNodePtr node, parNode = NULL, *dupls, *parNodes; /* node-table entries. */
    xmlSchemaIDCAugPtr aidc;
    int i, j, k, ret = 0, nbFields, oldNum, oldDupls;

    bind = vctxt->inode->idcTable;        
    if (bind == NULL) {
        /* Fine, no table, no bubbles. */
        return (0);
    }
    
    parTable = &(vctxt->elemInfos[vctxt->depth -1]->idcTable);
    /*
    * Walk all bindings; create new or add to existing bindings.
    * Remove duplicate key-sequences.
    */
    while (bind != NULL) {
        
        if ((bind->nbNodes == 0) && WXS_ILIST_IS_EMPTY(bind->dupls))
            goto next_binding;
        /*
        * Check if the key/unique IDC table needs to be bubbled.
        */
        if (! vctxt->createIDCNodeTables) {
            aidc = vctxt->aidcs;
            do {
                if (aidc->def == bind->definition) {
                    if ((aidc->keyrefDepth == -1) || 
                        (aidc->keyrefDepth >= vctxt->depth)) {
                        goto next_binding;
                    }
                    break;
                }
                aidc = aidc->next;
            } while (aidc != NULL);
        }

        if (parTable != NULL)
            parBind = *parTable;
        /*
        * Search a matching parent binding for the
        * IDC definition.
        */
        while (parBind != NULL) {           
            if (parBind->definition == bind->definition)
                break;
            parBind = parBind->next;
        }

        if (parBind != NULL) {
            /*
            * Compare every node-table entry of the child node, 
            * i.e. the key-sequence within, ...
            */
            oldNum = parBind->nbNodes; /* Skip newly added items. */

            if (! WXS_ILIST_IS_EMPTY(parBind->dupls)) {
                oldDupls = parBind->dupls->nbItems;
                dupls = (xmlSchemaPSVIIDCNodePtr *) parBind->dupls->items;
            } else {
                dupls = NULL;
                oldDupls = 0;           
            }
            
            parNodes = parBind->nodeTable;
            nbFields = bind->definition->nbFields;
            
            for (i = 0; i < bind->nbNodes; i++) {
                node = bind->nodeTable[i];
                if (node == NULL)
                    continue;
                /*
                * ...with every key-sequence of the parent node, already
                * evaluated to be a duplicate key-sequence.
                */
                if (oldDupls) {
                    j = 0; 
                    while (j < oldDupls) {
                        if (nbFields == 1) {
                            ret = xmlSchemaAreValuesEqual(
                                node->keys[0]->val,
                                dupls[j]->keys[0]->val);
                            if (ret == -1)
                                goto internal_error;
                            if (ret == 0) {
                                j++;
                                continue;
                            }
                        } else {
                            parNode = dupls[j];
                            for (k = 0; k < nbFields; k++) {
                                ret = xmlSchemaAreValuesEqual(
                                    node->keys[k]->val,
                                    parNode->keys[k]->val);
                                if (ret == -1)
                                    goto internal_error;
                                if (ret == 0)
                                    break;
                            }
                        }
                        if (ret == 1)
                            /* Duplicate found. */
                            break;
                        j++;
                    }
                    if (j != oldDupls) {
                        /* Duplicate found. Skip this entry. */
                        continue;
                    }
                }                   
                /*
                * ... and with every key-sequence of the parent node.
                */
                if (oldNum) {
                    j = 0; 
                    while (j < oldNum) {
                        parNode = parNodes[j];
                        if (nbFields == 1) {
                            ret = xmlSchemaAreValuesEqual(
                                node->keys[0]->val,
                                parNode->keys[0]->val);
                            if (ret == -1)
                                goto internal_error;
                            if (ret == 0) {
                                j++;
                                continue;
                            }
                        } else {                            
                            for (k = 0; k < nbFields; k++) {
                                ret = xmlSchemaAreValuesEqual(
                                    node->keys[k]->val,
                                    parNode->keys[k]->val);
                                if (ret == -1)
                                    goto internal_error;
                                if (ret == 0)
                                    break;
                            }
                        }
                        if (ret == 1)
                            /* Duplicate found. */
                            break;
                        j++;
                    }
                    if (j != oldNum) {
                        /*
                        * Handle duplicates. Move the duplicate in
                        * the parent's node-table to the list of
                        * duplicates.
                        */                      
                        oldNum--;
                        parBind->nbNodes--;
                        /*
                        * Move last old item to pos of duplicate.
                        */
                        parNodes[j] = parNodes[oldNum];
                        
                        if (parBind->nbNodes != oldNum) {
                            /*
                            * If new items exist, move last new item to 
                            * last of old items.
                            */
                            parNodes[oldNum] = 
                                parNodes[parBind->nbNodes];
                        }
                        if (parBind->dupls == NULL) {
                            parBind->dupls = xmlSchemaItemListCreate();
                            if (parBind->dupls == NULL)
                                goto internal_error;
                        }
                        xmlSchemaItemListAdd(parBind->dupls, parNode);                  
                    } else {
                        /*
                        * Add the node-table entry (node and key-sequence) of 
                        * the child node to the node table of the parent node.
                        */
                        if (parBind->nodeTable == NULL) {                       
                            parBind->nodeTable = (xmlSchemaPSVIIDCNodePtr *) 
                                xmlMalloc(10 * sizeof(xmlSchemaPSVIIDCNodePtr));
                            if (parBind->nodeTable == NULL) {
                                xmlSchemaVErrMemory(NULL, 
                                    "allocating IDC list of node-table items", NULL);
                                goto internal_error;
                            }
                            parBind->sizeNodes = 1;
                        } else if (parBind->nbNodes >= parBind->sizeNodes) {
                            parBind->sizeNodes *= 2;
                            parBind->nodeTable = (xmlSchemaPSVIIDCNodePtr *) 
                                xmlRealloc(parBind->nodeTable, parBind->sizeNodes * 
                                sizeof(xmlSchemaPSVIIDCNodePtr));
                            if (parBind->nodeTable == NULL) {
                                xmlSchemaVErrMemory(NULL, 
                                    "re-allocating IDC list of node-table items", NULL);
                                goto internal_error;
                            }                       
                        }
                        parNodes = parBind->nodeTable;
                        /*
                        * Append the new node-table entry to the 'new node-table
                        * entries' section.
                        */
                        parNodes[parBind->nbNodes++] = node;
                    }

                }       
                
            }   
        } else {
            /*
            * No binding for the IDC was found: create a new one and
            * copy all node-tables.
            */
            parBind = xmlSchemaIDCNewBinding(bind->definition);
            if (parBind == NULL)
                goto internal_error;
            
            /*
            * TODO: Hmm, how to optimize the initial number of
            * allocated entries?
            */
            if (bind->nbNodes != 0) {
                /*
                * Add all IDC node-table entries.
                */
                if (! vctxt->psviExposeIDCNodeTables) {
                    /*
                    * Just move the entries.
                    * NOTE: this is quite save here, since
                    * all the keyref lookups have already been
                    * performed.
                    */
                    parBind->nodeTable = bind->nodeTable;
                    bind->nodeTable = NULL;
                    parBind->sizeNodes = bind->sizeNodes;
                    bind->sizeNodes = 0;
                    parBind->nbNodes = bind->nbNodes;
                    bind->nbNodes = 0;
                } else {
                    /*
                    * Copy the entries.
                    */
                    parBind->nodeTable = (xmlSchemaPSVIIDCNodePtr *) 
                        xmlMalloc(bind->nbNodes *
                        sizeof(xmlSchemaPSVIIDCNodePtr));
                    if (parBind->nodeTable == NULL) {
                        xmlSchemaVErrMemory(NULL, 
                            "allocating an array of IDC node-table "
                            "items", NULL);
                        xmlSchemaIDCFreeBinding(parBind);
                        goto internal_error;
                    }
                    parBind->sizeNodes = bind->nbNodes;
                    parBind->nbNodes = bind->nbNodes;
                    memcpy(parBind->nodeTable, bind->nodeTable,
                        bind->nbNodes * sizeof(xmlSchemaPSVIIDCNodePtr));
                }
            }
            if (bind->dupls) {
                /*
                * Move the duplicates.
                */
                if (parBind->dupls != NULL)
                    xmlSchemaItemListFree(parBind->dupls);
                parBind->dupls = bind->dupls;
                bind->dupls = NULL;             
            }
            if (*parTable == NULL)
                *parTable = parBind;
            else {
                parBind->next = *parTable;
                *parTable = parBind;
            }      
        }       

next_binding:
        bind = bind->next;
    }
    return (0);

internal_error:
    return(-1);
}

/**
 * xmlSchemaCheckCVCIDCKeyRef:
 * @vctxt: the WXS validation context
 * @elemDecl: the element declaration
 *
 * Check the cvc-idc-keyref constraints.
 */
static int
xmlSchemaCheckCVCIDCKeyRef(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaIDCMatcherPtr matcher;
    xmlSchemaPSVIIDCBindingPtr bind;
    
    matcher = vctxt->inode->idcMatchers;
    /*
    * Find a keyref.
    */
    while (matcher != NULL) {
        if ((matcher->idcType == XML_SCHEMA_TYPE_IDC_KEYREF) &&
            matcher->targets &&
            matcher->targets->nbItems)
        {
            int i, j, k, res, nbFields, hasDupls;
            xmlSchemaPSVIIDCKeyPtr *refKeys, *keys;
            xmlSchemaPSVIIDCNodePtr refNode = NULL;

            nbFields = matcher->aidc->def->nbFields;

            /*
            * Find the IDC node-table for the referenced IDC key/unique.
            */
            bind = vctxt->inode->idcTable;
            while (bind != NULL) {
                if ((xmlSchemaIDCPtr) matcher->aidc->def->ref->item == 
                    bind->definition)
                    break;
                bind = bind->next;
            }
            hasDupls = (bind && bind->dupls && bind->dupls->nbItems) ? 1 : 0;
            /*
            * Search for a matching key-sequences.
            */
            for (i = 0; i < matcher->targets->nbItems; i++) {
                res = 0;
                refNode = matcher->targets->items[i];
                if (bind != NULL) {
                    refKeys = refNode->keys;
                    for (j = 0; j < bind->nbNodes; j++) {
                        keys = bind->nodeTable[j]->keys;
                        for (k = 0; k < nbFields; k++) {
                            res = xmlSchemaAreValuesEqual(keys[k]->val,
                                refKeys[k]->val);
                            if (res == 0)
                                break;
                            else if (res == -1) {
                                return (-1);
                            }
                        }
                        if (res == 1) {
                            /*
                            * Match found.
                            */
                            break;
                        }
                    }
                    if ((res == 0) && hasDupls) {
                        /*
                        * Search in duplicates
                        */
                        for (j = 0; j < bind->dupls->nbItems; j++) {
                            keys = ((xmlSchemaPSVIIDCNodePtr)
                                bind->dupls->items[j])->keys;
                            for (k = 0; k < nbFields; k++) {
                                res = xmlSchemaAreValuesEqual(keys[k]->val,
                                    refKeys[k]->val);
                                if (res == 0)
                                    break;
                                else if (res == -1) {
                                    return (-1);
                                }
                            }
                            if (res == 1) {
                                /*
                                * Match in duplicates found.
                                */
                                xmlChar *str = NULL, *strB = NULL;
                                xmlSchemaKeyrefErr(vctxt,
                                    XML_SCHEMAV_CVC_IDC, refNode,
                                    (xmlSchemaTypePtr) matcher->aidc->def,
                                    "More than one match found for "
                                    "key-sequence %s of keyref '%s'",
                                    xmlSchemaFormatIDCKeySequence(vctxt, &str,
                                        refNode->keys, nbFields),
                                    xmlSchemaGetComponentQName(&strB,
                                        matcher->aidc->def));
                                FREE_AND_NULL(str);
                                FREE_AND_NULL(strB);
                                break;
                            }
                        }
                    }
                }
                
                if (res == 0) {
                    xmlChar *str = NULL, *strB = NULL;
                    xmlSchemaKeyrefErr(vctxt,
                        XML_SCHEMAV_CVC_IDC, refNode,
                        (xmlSchemaTypePtr) matcher->aidc->def,
                        "No match found for key-sequence %s of keyref '%s'",
                        xmlSchemaFormatIDCKeySequence(vctxt, &str,
                            refNode->keys, nbFields),
                        xmlSchemaGetComponentQName(&strB, matcher->aidc->def));
                    FREE_AND_NULL(str);
                    FREE_AND_NULL(strB);
                }
            }
        }
        matcher = matcher->next;
    }
    /* TODO: Return an error if any error encountered. */
    return (0);
}

/************************************************************************
 *                                                                      *
 *                      XML Reader validation code                      *
 *                                                                      *
 ************************************************************************/

static xmlSchemaAttrInfoPtr
xmlSchemaGetFreshAttrInfo(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaAttrInfoPtr iattr;
    /*
    * Grow/create list of attribute infos.
    */
    if (vctxt->attrInfos == NULL) {
        vctxt->attrInfos = (xmlSchemaAttrInfoPtr *)
            xmlMalloc(sizeof(xmlSchemaAttrInfoPtr));
        vctxt->sizeAttrInfos = 1;
        if (vctxt->attrInfos == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "allocating attribute info list", NULL);
            return (NULL);
        }
    } else if (vctxt->sizeAttrInfos <= vctxt->nbAttrInfos) {
        vctxt->sizeAttrInfos++;
        vctxt->attrInfos = (xmlSchemaAttrInfoPtr *)
            xmlRealloc(vctxt->attrInfos,
                vctxt->sizeAttrInfos * sizeof(xmlSchemaAttrInfoPtr));
        if (vctxt->attrInfos == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "re-allocating attribute info list", NULL);
            return (NULL);
        }
    } else {
        iattr = vctxt->attrInfos[vctxt->nbAttrInfos++];
        if (iattr->localName != NULL) {
            VERROR_INT("xmlSchemaGetFreshAttrInfo",
                "attr info not cleared");
            return (NULL);
        }
        iattr->nodeType = XML_ATTRIBUTE_NODE;
        return (iattr);
    }
    /*
    * Create an attribute info.
    */
    iattr = (xmlSchemaAttrInfoPtr)
        xmlMalloc(sizeof(xmlSchemaAttrInfo));
    if (iattr == NULL) {
        xmlSchemaVErrMemory(vctxt, "creating new attribute info", NULL);
        return (NULL);
    }
    memset(iattr, 0, sizeof(xmlSchemaAttrInfo));
    iattr->nodeType = XML_ATTRIBUTE_NODE;
    vctxt->attrInfos[vctxt->nbAttrInfos++] = iattr;

    return (iattr);
}

static int
xmlSchemaValidatorPushAttribute(xmlSchemaValidCtxtPtr vctxt,
                        xmlNodePtr attrNode,
                        int nodeLine,
                        const xmlChar *localName,
                        const xmlChar *nsName,                  
                        int ownedNames,
                        xmlChar *value,
                        int ownedValue)
{
    xmlSchemaAttrInfoPtr attr;

    attr = xmlSchemaGetFreshAttrInfo(vctxt);
    if (attr == NULL) {
        VERROR_INT("xmlSchemaPushAttribute",
            "calling xmlSchemaGetFreshAttrInfo()");
        return (-1);
    }
    attr->node = attrNode;
    attr->nodeLine = nodeLine;
    attr->state = XML_SCHEMAS_ATTR_UNKNOWN;
    attr->localName = localName;
    attr->nsName = nsName;
    if (ownedNames)
        attr->flags |= XML_SCHEMA_NODE_INFO_FLAG_OWNED_NAMES;
    /*
    * Evaluate if it's an XSI attribute.
    */
    if (nsName != NULL) {
        if (xmlStrEqual(localName, BAD_CAST "nil")) {
            if (xmlStrEqual(attr->nsName, xmlSchemaInstanceNs)) {
                attr->metaType = XML_SCHEMA_ATTR_INFO_META_XSI_NIL;             
            }
        } else if (xmlStrEqual(localName, BAD_CAST "type")) {
            if (xmlStrEqual(attr->nsName, xmlSchemaInstanceNs)) {
                attr->metaType = XML_SCHEMA_ATTR_INFO_META_XSI_TYPE;
            }
        } else if (xmlStrEqual(localName, BAD_CAST "schemaLocation")) {
            if (xmlStrEqual(attr->nsName, xmlSchemaInstanceNs)) {
                attr->metaType = XML_SCHEMA_ATTR_INFO_META_XSI_SCHEMA_LOC;
            }
        } else if (xmlStrEqual(localName, BAD_CAST "noNamespaceSchemaLocation")) {
            if (xmlStrEqual(attr->nsName, xmlSchemaInstanceNs)) {
                attr->metaType = XML_SCHEMA_ATTR_INFO_META_XSI_NO_NS_SCHEMA_LOC;
            }
        } else if (xmlStrEqual(attr->nsName, xmlNamespaceNs)) {
            attr->metaType = XML_SCHEMA_ATTR_INFO_META_XMLNS;
        }
    }
    attr->value = value;
    if (ownedValue)
        attr->flags |= XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES;
    if (attr->metaType != 0)
        attr->state = XML_SCHEMAS_ATTR_META;
    return (0);
}

/**
 * xmlSchemaClearElemInfo:
 * @vctxt: the WXS validation context
 * @ielem: the element information item
 */
static void
xmlSchemaClearElemInfo(xmlSchemaValidCtxtPtr vctxt,
                       xmlSchemaNodeInfoPtr ielem)
{
    ielem->hasKeyrefs = 0;
    ielem->appliedXPath = 0;
    if (ielem->flags & XML_SCHEMA_NODE_INFO_FLAG_OWNED_NAMES) {
        FREE_AND_NULL(ielem->localName);
        FREE_AND_NULL(ielem->nsName);
    } else {
        ielem->localName = NULL;
        ielem->nsName = NULL;
    }
    if (ielem->flags & XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES) {
        FREE_AND_NULL(ielem->value);
    } else {
        ielem->value = NULL;
    }
    if (ielem->val != NULL) {
        /*
        * PSVI TODO: Be careful not to free it when the value is
        * exposed via PSVI.
        */
        xmlSchemaFreeValue(ielem->val);
        ielem->val = NULL;
    }
    if (ielem->idcMatchers != NULL) {
        /*
        * REVISIT OPTIMIZE TODO: Use a pool of IDC matchers.
        *   Does it work?
        */
        xmlSchemaIDCReleaseMatcherList(vctxt, ielem->idcMatchers);
#if 0
        xmlSchemaIDCFreeMatcherList(ielem->idcMatchers);
#endif
        ielem->idcMatchers = NULL;
    }
    if (ielem->idcTable != NULL) {
        /*
        * OPTIMIZE TODO: Use a pool of IDC tables??.
        */
        xmlSchemaIDCFreeIDCTable(ielem->idcTable);
        ielem->idcTable = NULL;
    }
    if (ielem->regexCtxt != NULL) {
        xmlRegFreeExecCtxt(ielem->regexCtxt);
        ielem->regexCtxt = NULL;
    }
    if (ielem->nsBindings != NULL) {
        xmlFree((xmlChar **)ielem->nsBindings);
        ielem->nsBindings = NULL;
        ielem->nbNsBindings = 0;
        ielem->sizeNsBindings = 0;
    }
}

/**
 * xmlSchemaGetFreshElemInfo:
 * @vctxt: the schema validation context
 *
 * Creates/reuses and initializes the element info item for
 * the currect tree depth.
 *
 * Returns the element info item or NULL on API or internal errors.
 */
static xmlSchemaNodeInfoPtr
xmlSchemaGetFreshElemInfo(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaNodeInfoPtr info = NULL;

    if (vctxt->depth > vctxt->sizeElemInfos) {
        VERROR_INT("xmlSchemaGetFreshElemInfo",
            "inconsistent depth encountered");
        return (NULL);
    }
    if (vctxt->elemInfos == NULL) {
        vctxt->elemInfos = (xmlSchemaNodeInfoPtr *)
            xmlMalloc(10 * sizeof(xmlSchemaNodeInfoPtr));
        if (vctxt->elemInfos == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "allocating the element info array", NULL);
            return (NULL);
        }
        memset(vctxt->elemInfos, 0, 10 * sizeof(xmlSchemaNodeInfoPtr));
        vctxt->sizeElemInfos = 10;
    } else if (vctxt->sizeElemInfos <= vctxt->depth) {
        int i = vctxt->sizeElemInfos;

        vctxt->sizeElemInfos *= 2;
        vctxt->elemInfos = (xmlSchemaNodeInfoPtr *)
            xmlRealloc(vctxt->elemInfos, vctxt->sizeElemInfos *
            sizeof(xmlSchemaNodeInfoPtr));
        if (vctxt->elemInfos == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "re-allocating the element info array", NULL);
            return (NULL);
        }
        /*
        * We need the new memory to be NULLed.
        * TODO: Use memset instead?
        */
        for (; i < vctxt->sizeElemInfos; i++)
            vctxt->elemInfos[i] = NULL;
    } else
        info = vctxt->elemInfos[vctxt->depth];

    if (info == NULL) {
        info = (xmlSchemaNodeInfoPtr)
            xmlMalloc(sizeof(xmlSchemaNodeInfo));
        if (info == NULL) {
            xmlSchemaVErrMemory(vctxt,
                "allocating an element info", NULL);
            return (NULL);
        }
        vctxt->elemInfos[vctxt->depth] = info;
    } else {
        if (info->localName != NULL) {
            VERROR_INT("xmlSchemaGetFreshElemInfo",
                "elem info has not been cleared");
            return (NULL);
        }
    }
    memset(info, 0, sizeof(xmlSchemaNodeInfo));
    info->nodeType = XML_ELEMENT_NODE;
    info->depth = vctxt->depth;

    return (info);
}

#define ACTIVATE_ATTRIBUTE(item) vctxt->inode = (xmlSchemaNodeInfoPtr) item;
#define ACTIVATE_ELEM vctxt->inode = vctxt->elemInfos[vctxt->depth];
#define ACTIVATE_PARENT_ELEM vctxt->inode = vctxt->elemInfos[vctxt->depth -1];

static int
xmlSchemaValidateFacets(xmlSchemaAbstractCtxtPtr actxt,
                        xmlNodePtr node,
                        xmlSchemaTypePtr type,
                        xmlSchemaValType valType,
                        const xmlChar * value,
                        xmlSchemaValPtr val,
                        unsigned long length,
                        int fireErrors)
{
    int ret, error = 0;

    xmlSchemaTypePtr tmpType;
    xmlSchemaFacetLinkPtr facetLink;
    xmlSchemaFacetPtr facet;
    unsigned long len = 0;
    xmlSchemaWhitespaceValueType ws;

    /*
    * In Libxml2, derived built-in types have currently no explicit facets.
    */
    if (type->type == XML_SCHEMA_TYPE_BASIC)
        return (0);

    /*
    * NOTE: Do not jump away, if the facetSet of the given type is
    * empty: until now, "pattern" and "enumeration" facets of the
    * *base types* need to be checked as well.
    */
    if (type->facetSet == NULL)
        goto pattern_and_enum;

    if (! WXS_IS_ATOMIC(type)) {
        if (WXS_IS_LIST(type))
            goto WXS_IS_LIST;
        else
            goto pattern_and_enum;
    }
    /*
    * Whitespace handling is only of importance for string-based
    * types.
    */
    tmpType = xmlSchemaGetPrimitiveType(type);
    if ((tmpType->builtInType == XML_SCHEMAS_STRING) ||
        WXS_IS_ANY_SIMPLE_TYPE(tmpType)) {
        ws = xmlSchemaGetWhiteSpaceFacetValue(type);
    } else
        ws = XML_SCHEMA_WHITESPACE_COLLAPSE;
    /*
    * If the value was not computed (for string or
    * anySimpleType based types), then use the provided
    * type.
    */
    if (val == NULL)
        valType = valType;
    else
        valType = xmlSchemaGetValType(val);
    
    ret = 0;
    for (facetLink = type->facetSet; facetLink != NULL;
        facetLink = facetLink->next) {
        /*
        * Skip the pattern "whiteSpace": it is used to
        * format the character content beforehand.
        */
        switch (facetLink->facet->type) {
            case XML_SCHEMA_FACET_WHITESPACE:
            case XML_SCHEMA_FACET_PATTERN:
            case XML_SCHEMA_FACET_ENUMERATION:
                continue;
            case XML_SCHEMA_FACET_LENGTH:
            case XML_SCHEMA_FACET_MINLENGTH:
            case XML_SCHEMA_FACET_MAXLENGTH:
                ret = xmlSchemaValidateLengthFacetWhtsp(facetLink->facet,
                    valType, value, val, &len, ws);
                break;
            default:
                ret = xmlSchemaValidateFacetWhtsp(facetLink->facet, ws,
                    valType, value, val, ws);
                break;
        }
        if (ret < 0) {
            AERROR_INT("xmlSchemaValidateFacets",
                "validating against a atomic type facet");
            return (-1);
        } else if (ret > 0) {
            if (fireErrors)
                xmlSchemaFacetErr(actxt, ret, node,
                value, len, type, facetLink->facet, NULL, NULL, NULL);
            else
                return (ret);
            if (error == 0)
                error = ret;
        }
        ret = 0;
    }

WXS_IS_LIST:
    if (! WXS_IS_LIST(type))
        goto pattern_and_enum;
    /*
    * "length", "minLength" and "maxLength" of list types.
    */
    ret = 0;
    for (facetLink = type->facetSet; facetLink != NULL;
        facetLink = facetLink->next) {
        
        switch (facetLink->facet->type) {
            case XML_SCHEMA_FACET_LENGTH:
            case XML_SCHEMA_FACET_MINLENGTH:
            case XML_SCHEMA_FACET_MAXLENGTH:                
                ret = xmlSchemaValidateListSimpleTypeFacet(facetLink->facet,
                    value, length, NULL);
                break;
            default:
                continue;
        }
        if (ret < 0) {
            AERROR_INT("xmlSchemaValidateFacets",
                "validating against a list type facet");
            return (-1);
        } else if (ret > 0) {
            if (fireErrors)             
                xmlSchemaFacetErr(actxt, ret, node,
                value, length, type, facetLink->facet, NULL, NULL, NULL);
            else
                return (ret);
            if (error == 0)
                error = ret;
        }
        ret = 0;
    }

pattern_and_enum:
    if (error >= 0) {
        int found = 0;
        /*
        * Process enumerations. Facet values are in the value space
        * of the defining type's base type. This seems to be a bug in the
        * XML Schema 1.0 spec. Use the whitespace type of the base type.
        * Only the first set of enumerations in the ancestor-or-self axis
        * is used for validation.
        */
        ret = 0;
        tmpType = type;
        do {
            for (facet = tmpType->facets; facet != NULL; facet = facet->next) {
                if (facet->type != XML_SCHEMA_FACET_ENUMERATION)
                    continue;
                found = 1;
                ret = xmlSchemaAreValuesEqual(facet->val, val);
                if (ret == 1)
                    break;
                else if (ret < 0) {
                    AERROR_INT("xmlSchemaValidateFacets",
                        "validating against an enumeration facet");
                    return (-1);
                }
            }
            if (ret != 0)
                break;
            /*
            * Break on the first set of enumerations. Any additional
            *  enumerations which might be existent on the ancestors
            *  of the current type are restricted by this set; thus
            *  *must* *not* be taken into account.
            */
            if (found)
                break;
            tmpType = tmpType->baseType;
        } while ((tmpType != NULL) &&
            (tmpType->type != XML_SCHEMA_TYPE_BASIC));
        if (found && (ret == 0)) {
            ret = XML_SCHEMAV_CVC_ENUMERATION_VALID;
            if (fireErrors) {
                xmlSchemaFacetErr(actxt, ret, node,
                    value, 0, type, NULL, NULL, NULL, NULL);
            } else
                return (ret);
            if (error == 0)
                error = ret;
        }
    }

    if (error >= 0) {
        int found;
        /*
        * Process patters. Pattern facets are ORed at type level
        * and ANDed if derived. Walk the base type axis.
        */
        tmpType = type;
        facet = NULL;
        do {
            found = 0;
            for (facetLink = tmpType->facetSet; facetLink != NULL;
                facetLink = facetLink->next) {
                if (facetLink->facet->type != XML_SCHEMA_FACET_PATTERN)
                    continue;
                found = 1;
                /* 
                * NOTE that for patterns, @value needs to be the
                * normalized vaule.
                */
                ret = xmlRegexpExec(facetLink->facet->regexp, value);
                if (ret == 1)
                    break;
                else if (ret < 0) {
                    AERROR_INT("xmlSchemaValidateFacets",
                        "validating against a pattern facet");
                    return (-1);
                } else {
                    /* 
                    * Save the last non-validating facet.
                    */
                    facet = facetLink->facet;
                }
            }
            if (found && (ret != 1)) {
                ret = XML_SCHEMAV_CVC_PATTERN_VALID;
                if (fireErrors) {
                    xmlSchemaFacetErr(actxt, ret, node,
                        value, 0, type, facet, NULL, NULL, NULL);
                } else
                    return (ret);
                if (error == 0)
                    error = ret;
                break;
            }
            tmpType = tmpType->baseType;
        } while ((tmpType != NULL) && (tmpType->type != XML_SCHEMA_TYPE_BASIC));
    }

    return (error);
}
 
static xmlChar *
xmlSchemaNormalizeValue(xmlSchemaTypePtr type,
                        const xmlChar *value)
{
    switch (xmlSchemaGetWhiteSpaceFacetValue(type)) {   
        case XML_SCHEMA_WHITESPACE_COLLAPSE:
            return (xmlSchemaCollapseString(value));
        case XML_SCHEMA_WHITESPACE_REPLACE:
            return (xmlSchemaWhiteSpaceReplace(value));
        default:
            return (NULL);
    }
}

static int
xmlSchemaValidateQName(xmlSchemaValidCtxtPtr vctxt,
                       const xmlChar *value,
                       xmlSchemaValPtr *val,
                       int valNeeded)
{
    int ret;
    const xmlChar *nsName;
    xmlChar *local, *prefix = NULL;
    
    ret = xmlValidateQName(value, 1);
    if (ret != 0) {
        if (ret == -1) {
            VERROR_INT("xmlSchemaValidateQName",
                "calling xmlValidateQName()");
            return (-1);
        }
        return( XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_1);
    }
    /*
    * NOTE: xmlSplitQName2 will always return a duplicated
    * strings.
    */
    local = xmlSplitQName2(value, &prefix);
    if (local == NULL)
        local = xmlStrdup(value);
    /*
    * OPTIMIZE TODO: Use flags for:
    *  - is there any namespace binding?
    *  - is there a default namespace?
    */
    nsName = xmlSchemaLookupNamespace(vctxt, prefix);
    
    if (prefix != NULL) {
        xmlFree(prefix);
        /*
        * A namespace must be found if the prefix is
        * NOT NULL.
        */
        if (nsName == NULL) {
            ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_1;
            xmlSchemaCustomErr(ACTXT_CAST vctxt, ret, NULL,
                WXS_BASIC_CAST xmlSchemaGetBuiltInType(XML_SCHEMAS_QNAME),
                "The QName value '%s' has no "
                "corresponding namespace declaration in "
                "scope", value, NULL);
            if (local != NULL)
                xmlFree(local);
            return (ret);
        }
    }
    if (valNeeded && val) {
        if (nsName != NULL)
            *val = xmlSchemaNewQNameValue(
                BAD_CAST xmlStrdup(nsName), BAD_CAST local);
        else
            *val = xmlSchemaNewQNameValue(NULL,
                BAD_CAST local);
    } else
        xmlFree(local);
    return (0);
}

/*
* cvc-simple-type
*/
static int
xmlSchemaVCheckCVCSimpleType(xmlSchemaAbstractCtxtPtr actxt,
                             xmlNodePtr node,
                             xmlSchemaTypePtr type,
                             const xmlChar *value,
                             xmlSchemaValPtr *retVal,
                             int fireErrors,
                             int normalize,
                             int isNormalized)
{
    int ret = 0, valNeeded = (retVal) ? 1 : 0;
    xmlSchemaValPtr val = NULL;
    /* xmlSchemaWhitespaceValueType ws; */
    xmlChar *normValue = NULL;

#define NORMALIZE(atype) \
    if ((! isNormalized) && \
    (normalize || (type->flags & XML_SCHEMAS_TYPE_NORMVALUENEEDED))) { \
        normValue = xmlSchemaNormalizeValue(atype, value); \
        if (normValue != NULL) \
            value = normValue; \
        isNormalized = 1; \
    }
    
    if ((retVal != NULL) && (*retVal != NULL)) {
        xmlSchemaFreeValue(*retVal);
        *retVal = NULL;
    }
    /*
    * 3.14.4 Simple Type Definition Validation Rules
    * Validation Rule: String Valid
    */
    /*
    * 1 It is schema-valid with respect to that definition as defined
    * by Datatype Valid in [XML Schemas: Datatypes].
    */
    /*
    * 2.1 If The definition is ENTITY or is validly derived from ENTITY given
    * the empty set, as defined in Type Derivation OK (Simple) (§3.14.6), then
    * the string must be a ·declared entity name·.
    */
    /*
    * 2.2 If The definition is ENTITIES or is validly derived from ENTITIES
    * given the empty set, as defined in Type Derivation OK (Simple) (§3.14.6),
    * then every whitespace-delimited substring of the string must be a ·declared
    * entity name·.
    */
    /*
    * 2.3 otherwise no further condition applies.
    */
    if ((! valNeeded) && (type->flags & XML_SCHEMAS_TYPE_FACETSNEEDVALUE))
        valNeeded = 1;
    if (value == NULL)
        value = BAD_CAST "";
    if (WXS_IS_ANY_SIMPLE_TYPE(type) || WXS_IS_ATOMIC(type)) {
        xmlSchemaTypePtr biType; /* The built-in type. */
        /*
        * SPEC (1.2.1) "if {variety} is ·atomic· then the string must ·match·
        * a literal in the ·lexical space· of {base type definition}"
        */
        /*
        * Whitespace-normalize.
        */
        NORMALIZE(type);
        if (type->type != XML_SCHEMA_TYPE_BASIC) {
            /*
            * Get the built-in type.
            */
            biType = type->baseType;
            while ((biType != NULL) &&
                (biType->type != XML_SCHEMA_TYPE_BASIC))
                biType = biType->baseType;

            if (biType == NULL) {
                AERROR_INT("xmlSchemaVCheckCVCSimpleType",
                    "could not get the built-in type");
                goto internal_error;
            }
        } else
            biType = type;
        /*
        * NOTATIONs need to be processed here, since they need
        * to lookup in the hashtable of NOTATION declarations of the schema.
        */
        if (actxt->type == XML_SCHEMA_CTXT_VALIDATOR) {     
            switch (biType->builtInType) {              
                case XML_SCHEMAS_NOTATION:                  
                    ret = xmlSchemaValidateNotation(
                        (xmlSchemaValidCtxtPtr) actxt,
                        ((xmlSchemaValidCtxtPtr) actxt)->schema,
                        NULL, value, &val, valNeeded);
                    break;
                case XML_SCHEMAS_QNAME:
                    ret = xmlSchemaValidateQName((xmlSchemaValidCtxtPtr) actxt,
                        value, &val, valNeeded);
                    break;
                default:
                    /* ws = xmlSchemaGetWhiteSpaceFacetValue(type); */
                    if (valNeeded)
                        ret = xmlSchemaValPredefTypeNodeNoNorm(biType,
                            value, &val, NULL);
                    else
                        ret = xmlSchemaValPredefTypeNodeNoNorm(biType,
                            value, NULL, NULL);
                    break;
            }
        } else if (actxt->type == XML_SCHEMA_CTXT_PARSER) {         
            switch (biType->builtInType) {                  
                case XML_SCHEMAS_NOTATION:
                    ret = xmlSchemaValidateNotation(NULL,
                        ((xmlSchemaParserCtxtPtr) actxt)->schema, node,
                        value, &val, valNeeded);
                    break;
                default:
                    /* ws = xmlSchemaGetWhiteSpaceFacetValue(type); */
                    if (valNeeded)
                        ret = xmlSchemaValPredefTypeNodeNoNorm(biType,
                            value, &val, node);
                    else
                        ret = xmlSchemaValPredefTypeNodeNoNorm(biType,
                            value, NULL, node);
                    break;
            }      
        } else {
            /*
            * Validation via a public API is not implemented yet.
            */
            TODO
            goto internal_error;
        }
        if (ret != 0) {
            if (ret < 0) {
                AERROR_INT("xmlSchemaVCheckCVCSimpleType",
                    "validating against a built-in type");
                goto internal_error;
            }
            if (WXS_IS_LIST(type))
                ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_2;
            else
                ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_1;         
        }
        if ((ret == 0) && (type->flags & XML_SCHEMAS_TYPE_HAS_FACETS)) {
            /*
            * Check facets.
            */
            ret = xmlSchemaValidateFacets(actxt, node, type,
                (xmlSchemaValType) biType->builtInType, value, val,
                0, fireErrors);
            if (ret != 0) {
                if (ret < 0) {
                    AERROR_INT("xmlSchemaVCheckCVCSimpleType",
                        "validating facets of atomic simple type");
                    goto internal_error;
                }
                if (WXS_IS_LIST(type)) 
                    ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_2;
                else
                    ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_1;         
            }
        }
        if (fireErrors && (ret > 0))
            xmlSchemaSimpleTypeErr(actxt, ret, node, value, type, 1);
    } else if (WXS_IS_LIST(type)) {

        xmlSchemaTypePtr itemType;
        const xmlChar *cur, *end;
        xmlChar *tmpValue = NULL;
        unsigned long len = 0;
        xmlSchemaValPtr prevVal = NULL, curVal = NULL;
        /* 1.2.2 if {variety} is ·list· then the string must be a sequence
        * of white space separated tokens, each of which ·match·es a literal
        * in the ·lexical space· of {item type definition}
        */
        /*
        * Note that XML_SCHEMAS_TYPE_NORMVALUENEEDED will be set if
        * the list type has an enum or pattern facet.
        */
        NORMALIZE(type);
        /*
        * VAL TODO: Optimize validation of empty values.
        * VAL TODO: We do not have computed values for lists.
        */
        itemType = WXS_LIST_ITEMTYPE(type);     
        cur = value;
        do {
            while (IS_BLANK_CH(*cur))
                cur++;
            end = cur;
            while ((*end != 0) && (!(IS_BLANK_CH(*end))))
                end++;
            if (end == cur)
                break;
            tmpValue = xmlStrndup(cur, end - cur);
            len++;

            if (valNeeded)
                ret = xmlSchemaVCheckCVCSimpleType(actxt, node, itemType,
                    tmpValue, &curVal, fireErrors, 0, 1);
            else
                ret = xmlSchemaVCheckCVCSimpleType(actxt, node, itemType,
                    tmpValue, NULL, fireErrors, 0, 1);
            FREE_AND_NULL(tmpValue);
            if (curVal != NULL) {
                /*
                * Add to list of computed values.
                */
                if (val == NULL)
                    val = curVal;
                else
                    xmlSchemaValueAppend(prevVal, curVal);
                prevVal = curVal;
                curVal = NULL;
            }
            if (ret != 0) {
                if (ret < 0) {
                    AERROR_INT("xmlSchemaVCheckCVCSimpleType",
                        "validating an item of list simple type");
                    goto internal_error;
                }
                ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_2;
                break;
            }       
            cur = end;
        } while (*cur != 0);
        FREE_AND_NULL(tmpValue);
        if ((ret == 0) && (type->flags & XML_SCHEMAS_TYPE_HAS_FACETS)) {
            /*
            * Apply facets (pattern, enumeration).
            */
            ret = xmlSchemaValidateFacets(actxt, node, type,
                XML_SCHEMAS_UNKNOWN, value, val,
                len, fireErrors);
            if (ret != 0) {
                if (ret < 0) {
                    AERROR_INT("xmlSchemaVCheckCVCSimpleType",
                        "validating facets of list simple type");
                    goto internal_error;
                }
                ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_2;
            }
        }
        if (fireErrors && (ret > 0)) {
            /* 
            * Report the normalized value.
            */
            normalize = 1;
            NORMALIZE(type);
            xmlSchemaSimpleTypeErr(actxt, ret, node, value, type, 1);
        }
    } else if (WXS_IS_UNION(type)) {
        xmlSchemaTypeLinkPtr memberLink;
        /*
        * TODO: For all datatypes ·derived· by ·union·  whiteSpace does
        * not apply directly; however, the normalization behavior of ·union·
        * types is controlled by the value of whiteSpace on that one of the
        * ·memberTypes· against which the ·union· is successfully validated.
        *
        * This means that the value is normalized by the first validating
        * member type, then the facets of the union type are applied. This
        * needs changing of the value!
        */

        /*
        * 1.2.3 if {variety} is ·union· then the string must ·match· a
        * literal in the ·lexical space· of at least one member of
        * {member type definitions}
        */
        memberLink = xmlSchemaGetUnionSimpleTypeMemberTypes(type);
        if (memberLink == NULL) {
            AERROR_INT("xmlSchemaVCheckCVCSimpleType",
                "union simple type has no member types");
            goto internal_error;
        }       
        /*
        * Always normalize union type values, since we currently
        * cannot store the whitespace information with the value
        * itself; otherwise a later value-comparison would be
        * not possible.
        */
        while (memberLink != NULL) {
            if (valNeeded) 
                ret = xmlSchemaVCheckCVCSimpleType(actxt, node,
                    memberLink->type, value, &val, 0, 1, 0);
            else
                ret = xmlSchemaVCheckCVCSimpleType(actxt, node,
                    memberLink->type, value, NULL, 0, 1, 0);
            if (ret <= 0)
                break;
            memberLink = memberLink->next;
        }
        if (ret != 0) {
            if (ret < 0) {
                AERROR_INT("xmlSchemaVCheckCVCSimpleType",
                    "validating members of union simple type");
                goto internal_error;
            }
            ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_3;
        }
        /*
        * Apply facets (pattern, enumeration).
        */
        if ((ret == 0) && (type->flags & XML_SCHEMAS_TYPE_HAS_FACETS)) {
            /*
            * The normalization behavior of ·union· types is controlled by
            * the value of whiteSpace on that one of the ·memberTypes·
            * against which the ·union· is successfully validated.
            */
            NORMALIZE(memberLink->type);
            ret = xmlSchemaValidateFacets(actxt, node, type,
                XML_SCHEMAS_UNKNOWN, value, val,
                0, fireErrors);
            if (ret != 0) {
                if (ret < 0) {
                    AERROR_INT("xmlSchemaVCheckCVCSimpleType",
                        "validating facets of union simple type");
                    goto internal_error;
                }
                ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_3;             
            }
        }
        if (fireErrors && (ret > 0))
            xmlSchemaSimpleTypeErr(actxt, ret, node, value, type, 1);
    }

    if (normValue != NULL)
        xmlFree(normValue);
    if (ret == 0) {
        if (retVal != NULL)
            *retVal = val;
        else if (val != NULL)
            xmlSchemaFreeValue(val);
    } else if (val != NULL)
        xmlSchemaFreeValue(val);
    return (ret);
internal_error:
    if (normValue != NULL)
        xmlFree(normValue);
    if (val != NULL)
        xmlSchemaFreeValue(val);
    return (-1);
}

static int
xmlSchemaVExpandQName(xmlSchemaValidCtxtPtr vctxt,
                           const xmlChar *value,
                           const xmlChar **nsName,
                           const xmlChar **localName)
{
    int ret = 0;

    if ((nsName == NULL) || (localName == NULL))
        return (-1);
    *nsName = NULL;
    *localName = NULL;

    ret = xmlValidateQName(value, 1);
    if (ret == -1)
        return (-1);
    if (ret > 0) {
        xmlSchemaSimpleTypeErr(ACTXT_CAST vctxt,
            XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_1, NULL,
            value, xmlSchemaGetBuiltInType(XML_SCHEMAS_QNAME), 1);
        return (1);
    }
    {
        xmlChar *local = NULL;
        xmlChar *prefix;

        /*
        * NOTE: xmlSplitQName2 will return a duplicated
        * string.
        */
        local = xmlSplitQName2(value, &prefix);
        if (local == NULL)
            *localName = xmlDictLookup(vctxt->dict, value, -1);
        else {
            *localName = xmlDictLookup(vctxt->dict, local, -1);
            xmlFree(local);
        }

        *nsName = xmlSchemaLookupNamespace(vctxt, prefix);

        if (prefix != NULL) {
            xmlFree(prefix);
            /*
            * A namespace must be found if the prefix is NOT NULL.
            */
            if (*nsName == NULL) {
                xmlSchemaCustomErr(ACTXT_CAST vctxt,
                    XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_1, NULL,
                    WXS_BASIC_CAST xmlSchemaGetBuiltInType(XML_SCHEMAS_QNAME),
                    "The QName value '%s' has no "
                    "corresponding namespace declaration in scope",
                    value, NULL);
                return (2);
            }
        }
    }
    return (0);
}

static int
xmlSchemaProcessXSIType(xmlSchemaValidCtxtPtr vctxt,
                        xmlSchemaAttrInfoPtr iattr,
                        xmlSchemaTypePtr *localType,
                        xmlSchemaElementPtr elemDecl)
{
    int ret = 0;
    /*
    * cvc-elt (3.3.4) : (4)
    * AND
    * Schema-Validity Assessment (Element) (cvc-assess-elt)
    *   (1.2.1.2.1) - (1.2.1.2.4)
    * Handle 'xsi:type'.
    */
    if (localType == NULL)
        return (-1);
    *localType = NULL;
    if (iattr == NULL)
        return (0);
    else {
        const xmlChar *nsName = NULL, *local = NULL;
        /*
        * TODO: We should report a *warning* that the type was overriden
        * by the instance.
        */
        ACTIVATE_ATTRIBUTE(iattr);
        /*
        * (cvc-elt) (3.3.4) : (4.1)
        * (cvc-assess-elt) (1.2.1.2.2)
        */
        ret = xmlSchemaVExpandQName(vctxt, iattr->value,
            &nsName, &local);
        if (ret != 0) {
            if (ret < 0) {
                VERROR_INT("xmlSchemaValidateElementByDeclaration",
                    "calling xmlSchemaQNameExpand() to validate the "
                    "attribute 'xsi:type'");
                goto internal_error;
            }
            goto exit;
        }
        /*
        * (cvc-elt) (3.3.4) : (4.2)
        * (cvc-assess-elt) (1.2.1.2.3)
        */
        *localType = xmlSchemaGetType(vctxt->schema, local, nsName);
        if (*localType == NULL) {
            xmlChar *str = NULL;

            xmlSchemaCustomErr(ACTXT_CAST vctxt,
                XML_SCHEMAV_CVC_ELT_4_2, NULL,
                WXS_BASIC_CAST xmlSchemaGetBuiltInType(XML_SCHEMAS_QNAME),
                "The QName value '%s' of the xsi:type attribute does not "
                "resolve to a type definition",
                xmlSchemaFormatQName(&str, nsName, local), NULL);
            FREE_AND_NULL(str);
            ret = vctxt->err;
            goto exit;
        }
        if (elemDecl != NULL) {
            int set = 0;

            /*
            * SPEC cvc-elt (3.3.4) : (4.3) (Type Derivation OK)
            * "The ·local type definition· must be validly
            * derived from the {type definition} given the union of
            * the {disallowed substitutions} and the {type definition}'s
            * {prohibited substitutions}, as defined in
            * Type Derivation OK (Complex) (§3.4.6)
            * (if it is a complex type definition),
            * or given {disallowed substitutions} as defined in Type
            * Derivation OK (Simple) (§3.14.6) (if it is a simple type
            * definition)."
            *
            * {disallowed substitutions}: the "block" on the element decl.
            * {prohibited substitutions}: the "block" on the type def.
            */
            /*
            * OPTIMIZE TODO: We could map types already evaluated
            * to be validly derived from other types to avoid checking
            * this over and over for the same types.
            */
            if ((elemDecl->flags & XML_SCHEMAS_ELEM_BLOCK_EXTENSION) ||
                (elemDecl->subtypes->flags &
                    XML_SCHEMAS_TYPE_BLOCK_EXTENSION))
                set |= SUBSET_EXTENSION;

            if ((elemDecl->flags & XML_SCHEMAS_ELEM_BLOCK_RESTRICTION) ||
                (elemDecl->subtypes->flags &
                    XML_SCHEMAS_TYPE_BLOCK_RESTRICTION))
                set |= SUBSET_RESTRICTION;

            /*
            * REMOVED and CHANGED since this produced a parser context
            * which adds to the string dict of the schema. So this would
            * change the schema and we don't want this. We don't need
            * the parser context anymore.
            *
            * if ((vctxt->pctxt == NULL) &&
            *   (xmlSchemaCreatePCtxtOnVCtxt(vctxt) == -1))
            *       return (-1);
            */

            if (xmlSchemaCheckCOSDerivedOK(ACTXT_CAST vctxt, *localType,
                elemDecl->subtypes, set) != 0) {
                xmlChar *str = NULL;

                xmlSchemaCustomErr(ACTXT_CAST vctxt,
                    XML_SCHEMAV_CVC_ELT_4_3, NULL, NULL,
                    "The type definition '%s', specified by xsi:type, is "
                    "blocked or not validly derived from the type definition "
                    "of the element declaration",
                    xmlSchemaFormatQName(&str,
                        (*localType)->targetNamespace,
                        (*localType)->name),
                    NULL);
                FREE_AND_NULL(str);
                ret = vctxt->err;
                *localType = NULL;
            }
        }
    }
exit:
    ACTIVATE_ELEM;
    return (ret);
internal_error:
    ACTIVATE_ELEM;
    return (-1);
}

static int
xmlSchemaValidateElemDecl(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaElementPtr elemDecl = vctxt->inode->decl;
    xmlSchemaTypePtr actualType;

    /*
    * cvc-elt (3.3.4) : 1
    */
    if (elemDecl == NULL) {
        VERROR(XML_SCHEMAV_CVC_ELT_1, NULL,
            "No matching declaration available");
        return (vctxt->err);
    }
    actualType = WXS_ELEM_TYPEDEF(elemDecl);
    /*
    * cvc-elt (3.3.4) : 2
    */
    if (elemDecl->flags & XML_SCHEMAS_ELEM_ABSTRACT) {
        VERROR(XML_SCHEMAV_CVC_ELT_2, NULL,
            "The element declaration is abstract");
        return (vctxt->err);
    }
    if (actualType == NULL) {
        VERROR(XML_SCHEMAV_CVC_TYPE_1, NULL,
            "The type definition is absent");
        return (XML_SCHEMAV_CVC_TYPE_1);
    }
    if (vctxt->nbAttrInfos != 0) {
        int ret;
        xmlSchemaAttrInfoPtr iattr;
        /*
        * cvc-elt (3.3.4) : 3
        * Handle 'xsi:nil'.
        */
        iattr = xmlSchemaGetMetaAttrInfo(vctxt,
            XML_SCHEMA_ATTR_INFO_META_XSI_NIL);
        if (iattr) {
            ACTIVATE_ATTRIBUTE(iattr);
            /*
            * Validate the value.
            */
            ret = xmlSchemaVCheckCVCSimpleType(
                ACTXT_CAST vctxt, NULL,
                xmlSchemaGetBuiltInType(XML_SCHEMAS_BOOLEAN),
                iattr->value, &(iattr->val), 1, 0, 0);
            ACTIVATE_ELEM;
            if (ret < 0) {
                VERROR_INT("xmlSchemaValidateElemDecl",
                    "calling xmlSchemaVCheckCVCSimpleType() to "
                    "validate the attribute 'xsi:nil'");
                return (-1);
            }
            if (ret == 0) {
                if ((elemDecl->flags & XML_SCHEMAS_ELEM_NILLABLE) == 0) {
                    /*
                    * cvc-elt (3.3.4) : 3.1
                    */
                    VERROR(XML_SCHEMAV_CVC_ELT_3_1, NULL,
                        "The element is not 'nillable'");
                    /* Does not return an error on purpose. */
                } else {
                    if (xmlSchemaValueGetAsBoolean(iattr->val)) {
                        /*
                        * cvc-elt (3.3.4) : 3.2.2
                        */
                        if ((elemDecl->flags & XML_SCHEMAS_ELEM_FIXED) &&
                            (elemDecl->value != NULL)) {
                            VERROR(XML_SCHEMAV_CVC_ELT_3_2_2, NULL,
                                "The element cannot be 'nilled' because "
                                "there is a fixed value constraint defined "
                                "for it");
                             /* Does not return an error on purpose. */
                        } else
                            vctxt->inode->flags |=
                                XML_SCHEMA_ELEM_INFO_NILLED;
                    }
                }
            }
        }
        /*
        * cvc-elt (3.3.4) : 4
        * Handle 'xsi:type'.
        */
        iattr = xmlSchemaGetMetaAttrInfo(vctxt,
            XML_SCHEMA_ATTR_INFO_META_XSI_TYPE);
        if (iattr) {
            xmlSchemaTypePtr localType = NULL;

            ret = xmlSchemaProcessXSIType(vctxt, iattr, &localType,
                elemDecl);
            if (ret != 0) {
                if (ret == -1) {
                    VERROR_INT("xmlSchemaValidateElemDecl",
                        "calling xmlSchemaProcessXSIType() to "
                        "process the attribute 'xsi:type'");
                    return (-1);
                }
                /* Does not return an error on purpose. */
            }
            if (localType != NULL) {
                vctxt->inode->flags |= XML_SCHEMA_ELEM_INFO_LOCAL_TYPE;
                actualType = localType;
            }
        }
    }
    /*
    * IDC: Register identity-constraint XPath matchers.
    */
    if ((elemDecl->idcs != NULL) &&
        (xmlSchemaIDCRegisterMatchers(vctxt, elemDecl) == -1))
            return (-1);
    /*
    * No actual type definition.
    */
    if (actualType == NULL) {
        VERROR(XML_SCHEMAV_CVC_TYPE_1, NULL,
            "The type definition is absent");
        return (XML_SCHEMAV_CVC_TYPE_1);
    }
    /*
    * Remember the actual type definition.
    */
    vctxt->inode->typeDef = actualType;

    return (0);
}

static int
xmlSchemaVAttributesSimple(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaAttrInfoPtr iattr;
    int ret = 0, i;

    /*
    * SPEC cvc-type (3.1.1)
    * "The attributes of must be empty, excepting those whose namespace
    * name is identical to http://www.w3.org/2001/XMLSchema-instance and
    * whose local name is one of type, nil, schemaLocation or
    * noNamespaceSchemaLocation."
    */
    if (vctxt->nbAttrInfos == 0)
        return (0);
    for (i = 0; i < vctxt->nbAttrInfos; i++) {
        iattr = vctxt->attrInfos[i];
        if (! iattr->metaType) {
            ACTIVATE_ATTRIBUTE(iattr)
            xmlSchemaIllegalAttrErr(ACTXT_CAST vctxt,
                XML_SCHEMAV_CVC_TYPE_3_1_1, iattr, NULL);
            ret = XML_SCHEMAV_CVC_TYPE_3_1_1;
        }
    }
    ACTIVATE_ELEM
    return (ret);
}

/*
* Cleanup currently used attribute infos.
*/
static void
xmlSchemaClearAttrInfos(xmlSchemaValidCtxtPtr vctxt)
{
    int i;
    xmlSchemaAttrInfoPtr attr;

    if (vctxt->nbAttrInfos == 0)
        return;
    for (i = 0; i < vctxt->nbAttrInfos; i++) {
        attr = vctxt->attrInfos[i];
        if (attr->flags & XML_SCHEMA_NODE_INFO_FLAG_OWNED_NAMES) {
            if (attr->localName != NULL)
                xmlFree((xmlChar *) attr->localName);
            if (attr->nsName != NULL)
                xmlFree((xmlChar *) attr->nsName);
        }
        if (attr->flags & XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES) {
            if (attr->value != NULL)
                xmlFree((xmlChar *) attr->value);
        }
        if (attr->val != NULL) {
            xmlSchemaFreeValue(attr->val);
            attr->val = NULL;
        }
        memset(attr, 0, sizeof(xmlSchemaAttrInfo));
    }
    vctxt->nbAttrInfos = 0;
}

/*
* 3.4.4 Complex Type Definition Validation Rules
*   Element Locally Valid (Complex Type) (cvc-complex-type)
* 3.2.4 Attribute Declaration Validation Rules
*   Validation Rule: Attribute Locally Valid (cvc-attribute)
*   Attribute Locally Valid (Use) (cvc-au)
*
* Only "assessed" attribute information items will be visible to
* IDCs. I.e. not "lax" (without declaration) and "skip" wild attributes.
*/
static int
xmlSchemaVAttributesComplex(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaTypePtr type = vctxt->inode->typeDef;    
    xmlSchemaItemListPtr attrUseList;
    xmlSchemaAttributeUsePtr attrUse = NULL;
    xmlSchemaAttributePtr attrDecl = NULL;
    xmlSchemaAttrInfoPtr iattr, tmpiattr;    
    int i, j, found, nbAttrs, nbUses;
    int xpathRes = 0, res, wildIDs = 0, fixed;
    xmlNodePtr defAttrOwnerElem = NULL;

    /*
    * SPEC (cvc-attribute)
    * (1) "The declaration must not be ·absent· (see Missing
    * Sub-components (§5.3) for how this can fail to be
    * the case)."
    * (2) "Its {type definition} must not be absent."
    *
    * NOTE (1) + (2): This is not handled here, since we currently do not
    * allow validation against schemas which have missing sub-components.
    *
    * SPEC (cvc-complex-type)
    * (3) "For each attribute information item in the element information
    * item's [attributes] excepting those whose [namespace name] is
    * identical to http://www.w3.org/2001/XMLSchema-instance and whose
    * [local name] is one of type, nil, schemaLocation or
    * noNamespaceSchemaLocation, the appropriate case among the following
    * must be true:
    *
    */
    attrUseList = (xmlSchemaItemListPtr) type->attrUses;
    /*
    * @nbAttrs is the number of attributes present in the instance.
    */
    nbAttrs = vctxt->nbAttrInfos;
    if (attrUseList != NULL)
        nbUses = attrUseList->nbItems;
    else
        nbUses = 0;
    for (i = 0; i < nbUses; i++) {
        found = 0;
        attrUse = attrUseList->items[i];
        attrDecl = WXS_ATTRUSE_DECL(attrUse);
        for (j = 0; j < nbAttrs; j++) {
            iattr = vctxt->attrInfos[j];
            /*
            * SPEC (cvc-complex-type) (3)
            * Skip meta attributes.
            */
            if (iattr->metaType)
                continue;
            if (iattr->localName[0] != attrDecl->name[0])
                continue;
            if (!xmlStrEqual(iattr->localName, attrDecl->name))
                continue;
            if (!xmlStrEqual(iattr->nsName, attrDecl->targetNamespace))
                continue;
            found = 1;
            /*
            * SPEC (cvc-complex-type)
            * (3.1) "If there is among the {attribute uses} an attribute
            * use with an {attribute declaration} whose {name} matches
            * the attribute information item's [local name] and whose
            * {target namespace} is identical to the attribute information
            * item's [namespace name] (where an ·absent· {target namespace}
            * is taken to be identical to a [namespace name] with no value),
            * then the attribute information must be ·valid· with respect
            * to that attribute use as per Attribute Locally Valid (Use)
            * (§3.5.4). In this case the {attribute declaration} of that
            * attribute use is the ·context-determined declaration· for the
            * attribute information item with respect to Schema-Validity
            * Assessment (Attribute) (§3.2.4) and
            * Assessment Outcome (Attribute) (§3.2.5).
            */
            iattr->state = XML_SCHEMAS_ATTR_ASSESSED;
            iattr->use = attrUse;
            /*
            * Context-determined declaration.
            */
            iattr->decl = attrDecl;
            iattr->typeDef = attrDecl->subtypes;
            break;
        }

        if (found)
            continue;

        if (attrUse->occurs == XML_SCHEMAS_ATTR_USE_REQUIRED) {
            /*
            * Handle non-existent, required attributes.
            *
            * SPEC (cvc-complex-type)
            * (4) "The {attribute declaration} of each attribute use in
            * the {attribute uses} whose {required} is true matches one
            * of the attribute information items in the element information
            * item's [attributes] as per clause 3.1 above."
            */
            tmpiattr = xmlSchemaGetFreshAttrInfo(vctxt);
            if (tmpiattr == NULL) {
                VERROR_INT(
                    "xmlSchemaVAttributesComplex",
                    "calling xmlSchemaGetFreshAttrInfo()");
                return (-1);
            }
            tmpiattr->state = XML_SCHEMAS_ATTR_ERR_MISSING;
            tmpiattr->use = attrUse;
            tmpiattr->decl = attrDecl;      
        } else if ((attrUse->occurs == XML_SCHEMAS_ATTR_USE_OPTIONAL) &&
            ((attrUse->defValue != NULL) ||
             (attrDecl->defValue != NULL))) {
            /*
            * Handle non-existent, optional, default/fixed attributes.
            */
            tmpiattr = xmlSchemaGetFreshAttrInfo(vctxt);
            if (tmpiattr == NULL) {
                VERROR_INT(
                    "xmlSchemaVAttributesComplex",
                    "calling xmlSchemaGetFreshAttrInfo()");
                return (-1);
            }
            tmpiattr->state = XML_SCHEMAS_ATTR_DEFAULT;
            tmpiattr->use = attrUse;
            tmpiattr->decl = attrDecl;
            tmpiattr->typeDef = attrDecl->subtypes;
            tmpiattr->localName = attrDecl->name;
            tmpiattr->nsName = attrDecl->targetNamespace;
        }
    }

    if (vctxt->nbAttrInfos == 0)
        return (0);
    nbUses = vctxt->nbAttrInfos;
    /*
    * Validate against the wildcard.
    */
    if (type->attributeWildcard != NULL) {
        /*
        * SPEC (cvc-complex-type)
        * (3.2.1) "There must be an {attribute wildcard}."
        */
        for (i = 0; i < nbAttrs; i++) {
            iattr = vctxt->attrInfos[i];
            /*
            * SPEC (cvc-complex-type) (3)
            * Skip meta attributes.
            */
            if (iattr->state != XML_SCHEMAS_ATTR_UNKNOWN)
                continue;
            /*
            * SPEC (cvc-complex-type)
            * (3.2.2) "The attribute information item must be ·valid· with
            * respect to it as defined in Item Valid (Wildcard) (§3.10.4)."
            *
            * SPEC Item Valid (Wildcard) (cvc-wildcard)
            * "... its [namespace name] must be ·valid· with respect to
            * the wildcard constraint, as defined in Wildcard allows
            * Namespace Name (§3.10.4)."
            */
            if (xmlSchemaCheckCVCWildcardNamespace(type->attributeWildcard,
                    iattr->nsName) == 0) {
                /*
                * Handle processContents.
                *
                * SPEC (cvc-wildcard):
                * processContents | context-determined declaration:
                * "strict"          "mustFind"
                * "lax"             "none"
                * "skip"            "skip"
                */
                if (type->attributeWildcard->processContents ==
                    XML_SCHEMAS_ANY_SKIP) {
                     /*
                    * context-determined declaration = "skip"
                    *
                    * SPEC PSVI Assessment Outcome (Attribute)
                    * [validity] = "notKnown"
                    * [validation attempted] = "none"
                    */
                    iattr->state = XML_SCHEMAS_ATTR_WILD_SKIP;
                    continue;
                }
                /*
                * Find an attribute declaration.
                */
                iattr->decl = xmlSchemaGetAttributeDecl(vctxt->schema,
                    iattr->localName, iattr->nsName);
                if (iattr->decl != NULL) {
                    iattr->state = XML_SCHEMAS_ATTR_ASSESSED;
                    /*
                    * SPEC (cvc-complex-type)
                    * (5) "Let [Definition:]  the wild IDs be the set of
                    * all attribute information item to which clause 3.2
                    * applied and whose ·validation· resulted in a
                    * ·context-determined declaration· of mustFind or no
                    * ·context-determined declaration· at all, and whose
                    * [local name] and [namespace name] resolve (as
                    * defined by QName resolution (Instance) (§3.15.4)) to
                    * an attribute declaration whose {type definition} is
                    * or is derived from ID. Then all of the following
                    * must be true:"
                    */
                    iattr->typeDef = WXS_ATTR_TYPEDEF(iattr->decl);
                    if (xmlSchemaIsDerivedFromBuiltInType(
                        iattr->typeDef, XML_SCHEMAS_ID)) {
                        /*
                        * SPEC (5.1) "There must be no more than one
                        * item in ·wild IDs·."
                        */
                        if (wildIDs != 0) {
                            /* VAL TODO */
                            iattr->state = XML_SCHEMAS_ATTR_ERR_WILD_DUPLICATE_ID;
                            TODO
                            continue;
                        }
                        wildIDs++;
                        /*
                        * SPEC (cvc-complex-type)
                        * (5.2) "If ·wild IDs· is non-empty, there must not
                        * be any attribute uses among the {attribute uses}
                        * whose {attribute declaration}'s {type definition}
                        * is or is derived from ID."
                        */
                        for (j = 0; j < attrUseList->nbItems; j++) {
                            if (xmlSchemaIsDerivedFromBuiltInType(
                                WXS_ATTRUSE_TYPEDEF(attrUseList->items[j]),
                                XML_SCHEMAS_ID)) {
                                /* URGENT VAL TODO: implement */
                                iattr->state = XML_SCHEMAS_ATTR_ERR_WILD_AND_USE_ID;
                                TODO
                                break;
                            }
                        }
                    }
                } else if (type->attributeWildcard->processContents ==
                    XML_SCHEMAS_ANY_LAX) {
                    iattr->state = XML_SCHEMAS_ATTR_WILD_LAX_NO_DECL;
                    /*
                    * SPEC PSVI Assessment Outcome (Attribute)
                    * [validity] = "notKnown"
                    * [validation attempted] = "none"
                    */
                } else {
                    iattr->state = XML_SCHEMAS_ATTR_ERR_WILD_STRICT_NO_DECL;
                }
            }
        }
    }

    if (vctxt->nbAttrInfos == 0)
        return (0);

    /*
    * Get the owner element; needed for creation of default attributes.
    * This fixes bug #341337, reported by David Grohmann.
    */
    if (vctxt->options & XML_SCHEMA_VAL_VC_I_CREATE) {
        xmlSchemaNodeInfoPtr ielem = vctxt->elemInfos[vctxt->depth];
        if (ielem && ielem->node && ielem->node->doc)
            defAttrOwnerElem = ielem->node;
    }
    /*
    * Validate values, create default attributes, evaluate IDCs.
    */
    for (i = 0; i < vctxt->nbAttrInfos; i++) {
        iattr = vctxt->attrInfos[i];
        /*
        * VAL TODO: Note that we won't try to resolve IDCs to
        * "lax" and "skip" validated attributes. Check what to
        * do in this case.
        */
        if ((iattr->state != XML_SCHEMAS_ATTR_ASSESSED) &&
            (iattr->state != XML_SCHEMAS_ATTR_DEFAULT))
            continue;
        /*
        * VAL TODO: What to do if the type definition is missing?
        */
        if (iattr->typeDef == NULL) {
            iattr->state = XML_SCHEMAS_ATTR_ERR_NO_TYPE;
            continue;
        }

        ACTIVATE_ATTRIBUTE(iattr);
        fixed = 0;
        xpathRes = 0;

        if (vctxt->xpathStates != NULL) {
            /*
            * Evaluate IDCs.
            */
            xpathRes = xmlSchemaXPathEvaluate(vctxt,
                XML_ATTRIBUTE_NODE);
            if (xpathRes == -1) {
                VERROR_INT("xmlSchemaVAttributesComplex",
                    "calling xmlSchemaXPathEvaluate()");
                goto internal_error;
            }
        }

        if (iattr->state == XML_SCHEMAS_ATTR_DEFAULT) {
            /*
            * Default/fixed attributes.
            * We need the value only if we need to resolve IDCs or
            * will create default attributes.
            */
            if ((xpathRes) || (defAttrOwnerElem)) {
                if (iattr->use->defValue != NULL) {
                    iattr->value = (xmlChar *) iattr->use->defValue;
                    iattr->val = iattr->use->defVal;
                } else {
                    iattr->value = (xmlChar *) iattr->decl->defValue;
                    iattr->val = iattr->decl->defVal;
                }
                /*
                * IDCs will consume the precomputed default value,
                * so we need to clone it.
                */
                if (iattr->val == NULL) {
                    VERROR_INT("xmlSchemaVAttributesComplex",
                        "default/fixed value on an attribute use was "
                        "not precomputed");
                    goto internal_error;
                }
                iattr->val = xmlSchemaCopyValue(iattr->val);
                if (iattr->val == NULL) {
                    VERROR_INT("xmlSchemaVAttributesComplex",
                        "calling xmlSchemaCopyValue()");
                    goto internal_error;
                }
            }
            /*
            * PSVI: Add the default attribute to the current element.
            * VAL TODO: Should we use the *normalized* value? This currently
            *   uses the *initial* value.
            */
            
            if (defAttrOwnerElem) {
                xmlChar *normValue;
                const xmlChar *value;

                value = iattr->value;
                /*
                * Normalize the value.
                */
                normValue = xmlSchemaNormalizeValue(iattr->typeDef,
                    iattr->value);
                if (normValue != NULL)
                    value = BAD_CAST normValue;

                if (iattr->nsName == NULL) {
                    if (xmlNewProp(defAttrOwnerElem,
                        iattr->localName, value) == NULL) {
                        VERROR_INT("xmlSchemaVAttributesComplex",
                            "callling xmlNewProp()");
                        if (normValue != NULL)
                            xmlFree(normValue);
                        goto internal_error;
                    }
                } else {
                    xmlNsPtr ns;

                    ns = xmlSearchNsByHref(defAttrOwnerElem->doc,
                        defAttrOwnerElem, iattr->nsName);
                    if (ns == NULL) {
                        xmlChar prefix[12];
                        int counter = 0;

                        /*
                        * Create a namespace declaration on the validation
                        * root node if no namespace declaration is in scope.
                        */
                        do {
                            snprintf((char *) prefix, 12, "p%d", counter++);
                            ns = xmlSearchNs(defAttrOwnerElem->doc,
                                defAttrOwnerElem, BAD_CAST prefix);
                            if (counter > 1000) {
                                VERROR_INT(
                                    "xmlSchemaVAttributesComplex",
                                    "could not compute a ns prefix for a "
                                    "default/fixed attribute");
                                if (normValue != NULL)
                                    xmlFree(normValue);
                                goto internal_error;
                            }
                        } while (ns != NULL);
                        ns = xmlNewNs(vctxt->validationRoot,
                            iattr->nsName, BAD_CAST prefix);
                    }
                    /*
                    * TODO:
                    * http://lists.w3.org/Archives/Public/www-xml-schema-comments/2005JulSep/0406.html
                    * If we have QNames: do we need to ensure there's a
                    * prefix defined for the QName?
                    */
                    xmlNewNsProp(defAttrOwnerElem, ns, iattr->localName, value);
                }
                if (normValue != NULL)
                    xmlFree(normValue);
            }
            /*
            * Go directly to IDC evaluation.
            */
            goto eval_idcs;
        }
        /*
        * Validate the value.
        */
        if (vctxt->value != NULL) {
            /*
            * Free last computed value; just for safety reasons.
            */
            xmlSchemaFreeValue(vctxt->value);
            vctxt->value = NULL;
        }
        /*
        * Note that the attribute *use* can be unavailable, if
        * the attribute was a wild attribute.
        */
        if ((iattr->decl->flags & XML_SCHEMAS_ATTR_FIXED) ||
            ((iattr->use != NULL) &&
             (iattr->use->flags & XML_SCHEMAS_ATTR_FIXED)))
            fixed = 1;
        else
            fixed = 0;
        /*
        * SPEC (cvc-attribute)
        * (3) "The item's ·normalized value· must be locally ·valid·
        * with respect to that {type definition} as per 
        * String Valid (§3.14.4)."
        *
        * VAL TODO: Do we already have the
        * "normalized attribute value" here?
        */
        if (xpathRes || fixed) {
            iattr->flags |= XML_SCHEMA_NODE_INFO_VALUE_NEEDED;
            /*
            * Request a computed value.
            */
            res = xmlSchemaVCheckCVCSimpleType(
                ACTXT_CAST vctxt,
                iattr->node, iattr->typeDef, iattr->value, &(iattr->val),
                1, 1, 0);
        } else {
            res = xmlSchemaVCheckCVCSimpleType(
                ACTXT_CAST vctxt,
                iattr->node, iattr->typeDef, iattr->value, NULL,
                1, 0, 0);
        }
            
        if (res != 0) {
            if (res == -1) {
                VERROR_INT("xmlSchemaVAttributesComplex",
                    "calling xmlSchemaStreamValidateSimpleTypeValue()");
                goto internal_error;
            }
            iattr->state = XML_SCHEMAS_ATTR_INVALID_VALUE;
            /*
            * SPEC PSVI Assessment Outcome (Attribute)
            * [validity] = "invalid"
            */
            goto eval_idcs;
        }

        if (fixed) {        
            /*
            * SPEC Attribute Locally Valid (Use) (cvc-au)
            * "For an attribute information item to be·valid·
            * with respect to an attribute use its *normalized*
            * value· must match the *canonical* lexical
            * representation of the attribute use's {value
            * constraint}value, if it is present and fixed."
            *
            * VAL TODO: The requirement for the *canonical* value
            * will be removed in XML Schema 1.1.
            */
            /*
            * SPEC Attribute Locally Valid (cvc-attribute)
            * (4) "The item's *actual* value· must match the *value* of
            * the {value constraint}, if it is present and fixed."
            */
            if (iattr->val == NULL) {
                /* VAL TODO: A value was not precomputed. */
                TODO
                goto eval_idcs;
            }
            if ((iattr->use != NULL) &&
                (iattr->use->defValue != NULL)) {
                if (iattr->use->defVal == NULL) {
                    /* VAL TODO: A default value was not precomputed. */
                    TODO
                    goto eval_idcs;
                }
                iattr->vcValue = iattr->use->defValue;
                /*
                if (xmlSchemaCompareValuesWhtsp(attr->val,
                    (xmlSchemaWhitespaceValueType) ws,
                    attr->use->defVal,
                    (xmlSchemaWhitespaceValueType) ws) != 0) {
                */
                if (! xmlSchemaAreValuesEqual(iattr->val, iattr->use->defVal))
                    iattr->state = XML_SCHEMAS_ATTR_ERR_FIXED_VALUE;
            } else {
                if (iattr->decl->defVal == NULL) {
                    /* VAL TODO: A default value was not precomputed. */
                    TODO
                    goto eval_idcs;
                }
                iattr->vcValue = iattr->decl->defValue;
                /*
                if (xmlSchemaCompareValuesWhtsp(attr->val,
                    (xmlSchemaWhitespaceValueType) ws,
                    attrDecl->defVal,
                    (xmlSchemaWhitespaceValueType) ws) != 0) {
                */
                if (! xmlSchemaAreValuesEqual(iattr->val, iattr->decl->defVal))
                    iattr->state = XML_SCHEMAS_ATTR_ERR_FIXED_VALUE;
            }
            /*
            * [validity] = "valid"
            */
        }
eval_idcs:
        /*
        * Evaluate IDCs.
        */
        if (xpathRes) {
            if (xmlSchemaXPathProcessHistory(vctxt,
                vctxt->depth +1) == -1) {
                VERROR_INT("xmlSchemaVAttributesComplex",
                    "calling xmlSchemaXPathEvaluate()");
                goto internal_error;
            }
        } else if (vctxt->xpathStates != NULL)
            xmlSchemaXPathPop(vctxt);
    }

    /*
    * Report errors.
    */
    for (i = 0; i < vctxt->nbAttrInfos; i++) {
        iattr = vctxt->attrInfos[i];
        if ((iattr->state == XML_SCHEMAS_ATTR_META) ||
            (iattr->state == XML_SCHEMAS_ATTR_ASSESSED) ||
            (iattr->state == XML_SCHEMAS_ATTR_WILD_SKIP) ||
            (iattr->state == XML_SCHEMAS_ATTR_WILD_LAX_NO_DECL))
            continue;
        ACTIVATE_ATTRIBUTE(iattr);
        switch (iattr->state) {
            case XML_SCHEMAS_ATTR_ERR_MISSING: {
                    xmlChar *str = NULL;
                    ACTIVATE_ELEM;
                    xmlSchemaCustomErr(ACTXT_CAST vctxt,
                        XML_SCHEMAV_CVC_COMPLEX_TYPE_4, NULL, NULL,
                        "The attribute '%s' is required but missing",
                        xmlSchemaFormatQName(&str,
                            iattr->decl->targetNamespace,
                            iattr->decl->name),
                        NULL);
                    FREE_AND_NULL(str)
                    break;
                }
            case XML_SCHEMAS_ATTR_ERR_NO_TYPE:
                VERROR(XML_SCHEMAV_CVC_ATTRIBUTE_2, NULL,
                    "The type definition is absent");
                break;
            case XML_SCHEMAS_ATTR_ERR_FIXED_VALUE:
                xmlSchemaCustomErr(ACTXT_CAST vctxt,
                    XML_SCHEMAV_CVC_AU, NULL, NULL,
                    "The value '%s' does not match the fixed "
                    "value constraint '%s'", 
                    iattr->value, iattr->vcValue);              
                break;
            case XML_SCHEMAS_ATTR_ERR_WILD_STRICT_NO_DECL:
                VERROR(XML_SCHEMAV_CVC_WILDCARD, NULL,
                    "No matching global attribute declaration available, but "
                    "demanded by the strict wildcard");
                break;
            case XML_SCHEMAS_ATTR_UNKNOWN:
                if (iattr->metaType)
                    break;
                /*
                * MAYBE VAL TODO: One might report different error messages
                * for the following errors.
                */
                if (type->attributeWildcard == NULL) {
                    xmlSchemaIllegalAttrErr(ACTXT_CAST vctxt,
                        XML_SCHEMAV_CVC_COMPLEX_TYPE_3_2_1, iattr, NULL);
                } else {
                    xmlSchemaIllegalAttrErr(ACTXT_CAST vctxt,
                        XML_SCHEMAV_CVC_COMPLEX_TYPE_3_2_2, iattr, NULL);
                }
                break;
            default:
                break;
        }
    }

    ACTIVATE_ELEM;
    return (0);
internal_error:
    ACTIVATE_ELEM;
    return (-1);
}

static int
xmlSchemaValidateElemWildcard(xmlSchemaValidCtxtPtr vctxt,
                              int *skip)
{
    xmlSchemaWildcardPtr wild = (xmlSchemaWildcardPtr) vctxt->inode->decl;
    /*
    * The namespace of the element was already identified to be
    * matching the wildcard.
    */
    if ((skip == NULL) || (wild == NULL) ||
        (wild->type != XML_SCHEMA_TYPE_ANY)) {
        VERROR_INT("xmlSchemaValidateElemWildcard",
            "bad arguments");
        return (-1);
    }
    *skip = 0;
    if (wild->processContents == XML_SCHEMAS_ANY_SKIP) {
        /*
        * URGENT VAL TODO: Either we need to position the stream to the
        * next sibling, or walk the whole subtree.
        */
        *skip = 1;
        return (0);
    }
    {
        xmlSchemaElementPtr decl = NULL;

        decl = xmlSchemaGetElem(vctxt->schema,
            vctxt->inode->localName, vctxt->inode->nsName);         
        if (decl != NULL) {
            vctxt->inode->decl = decl;
            return (0);
        }
    }
    if (wild->processContents == XML_SCHEMAS_ANY_STRICT) {
        /* VAL TODO: Change to proper error code. */
        VERROR(XML_SCHEMAV_CVC_ELT_1, NULL, /* WXS_BASIC_CAST wild */
            "No matching global element declaration available, but "
            "demanded by the strict wildcard");
        return (vctxt->err);
    }
    if (vctxt->nbAttrInfos != 0) {
        xmlSchemaAttrInfoPtr iattr;
        /*
        * SPEC Validation Rule: Schema-Validity Assessment (Element)
        * (1.2.1.2.1) - (1.2.1.2.3 )
        *
        * Use the xsi:type attribute for the type definition.
        */
        iattr = xmlSchemaGetMetaAttrInfo(vctxt,
            XML_SCHEMA_ATTR_INFO_META_XSI_TYPE);
        if (iattr != NULL) {
            if (xmlSchemaProcessXSIType(vctxt, iattr,
                &(vctxt->inode->typeDef), NULL) == -1) {
                VERROR_INT("xmlSchemaValidateElemWildcard",
                    "calling xmlSchemaProcessXSIType() to "
                    "process the attribute 'xsi:nil'");
                return (-1);
            }
            /*
            * Don't return an error on purpose.
            */
            return (0);
        }
    }
    /*
    * SPEC Validation Rule: Schema-Validity Assessment (Element)
    *
    * Fallback to "anyType".
    */
    vctxt->inode->typeDef =
        xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYTYPE);
    return (0);
}

/*
* xmlSchemaCheckCOSValidDefault:
*
* This will be called if: not nilled, no content and a default/fixed
* value is provided.
*/

static int
xmlSchemaCheckCOSValidDefault(xmlSchemaValidCtxtPtr vctxt,
                              const xmlChar *value,
                              xmlSchemaValPtr *val)
{   
    int ret = 0;
    xmlSchemaNodeInfoPtr inode = vctxt->inode;

    /*
    * cos-valid-default:
    * Schema Component Constraint: Element Default Valid (Immediate)
    * For a string to be a valid default with respect to a type 
    * definition the appropriate case among the following must be true:
    */    
    if WXS_IS_COMPLEX(inode->typeDef) {
        /*
        * Complex type.
        *
        * SPEC (2.1) "its {content type} must be a simple type definition
        * or mixed."
        * SPEC (2.2.2) "If the {content type} is mixed, then the {content
        * type}'s particle must be ·emptiable· as defined by 
        * Particle Emptiable (§3.9.6)."
        */
        if ((! WXS_HAS_SIMPLE_CONTENT(inode->typeDef)) &&
            ((! WXS_HAS_MIXED_CONTENT(inode->typeDef)) ||
             (! WXS_EMPTIABLE(inode->typeDef)))) {
            ret = XML_SCHEMAP_COS_VALID_DEFAULT_2_1;
            /* NOTE that this covers (2.2.2) as well. */
            VERROR(ret, NULL,
                "For a string to be a valid default, the type definition "
                "must be a simple type or a complex type with simple content "
                "or mixed content and a particle emptiable");
            return(ret);
        }
    }   
    /*
    * 1 If the type definition is a simple type definition, then the string 
    * must be ·valid· with respect to that definition as defined by String 
    * Valid (§3.14.4).
    *
    * AND
    *
    * 2.2.1 If the {content type} is a simple type definition, then the 
    * string must be ·valid· with respect to that simple type definition 
    * as defined by String Valid (§3.14.4).
    */  
    if (WXS_IS_SIMPLE(inode->typeDef)) {

        ret = xmlSchemaVCheckCVCSimpleType(ACTXT_CAST vctxt,
            NULL, inode->typeDef, value, val, 1, 1, 0);

    } else if (WXS_HAS_SIMPLE_CONTENT(inode->typeDef)) {

        ret = xmlSchemaVCheckCVCSimpleType(ACTXT_CAST vctxt,
            NULL, inode->typeDef->contentTypeDef, value, val, 1, 1, 0);
    }
    if (ret < 0) {
        VERROR_INT("xmlSchemaCheckCOSValidDefault",
            "calling xmlSchemaVCheckCVCSimpleType()");
    }    
    return (ret);
}

static void
xmlSchemaVContentModelCallback(xmlSchemaValidCtxtPtr vctxt ATTRIBUTE_UNUSED,
                               const xmlChar * name ATTRIBUTE_UNUSED,
                               xmlSchemaElementPtr item,
                               xmlSchemaNodeInfoPtr inode)
{
    inode->decl = item;
#ifdef DEBUG_CONTENT
    {
        xmlChar *str = NULL;

        if (item->type == XML_SCHEMA_TYPE_ELEMENT) {
            xmlGenericError(xmlGenericErrorContext,
                "AUTOMATON callback for '%s' [declaration]\n",
                xmlSchemaFormatQName(&str,
                inode->localName, inode->nsName));
        } else {
            xmlGenericError(xmlGenericErrorContext,
                    "AUTOMATON callback for '%s' [wildcard]\n",
                    xmlSchemaFormatQName(&str,
                    inode->localName, inode->nsName));

        }
        FREE_AND_NULL(str)
    }
#endif
}

static int
xmlSchemaValidatorPushElem(xmlSchemaValidCtxtPtr vctxt)
{    
    vctxt->inode = xmlSchemaGetFreshElemInfo(vctxt);
    if (vctxt->inode == NULL) {
        VERROR_INT("xmlSchemaValidatorPushElem",
            "calling xmlSchemaGetFreshElemInfo()");
        return (-1);
    }   
    vctxt->nbAttrInfos = 0;
    return (0);
}

static int
xmlSchemaVCheckINodeDataType(xmlSchemaValidCtxtPtr vctxt,
                             xmlSchemaNodeInfoPtr inode,
                             xmlSchemaTypePtr type,
                             const xmlChar *value)
{
    if (inode->flags & XML_SCHEMA_NODE_INFO_VALUE_NEEDED)
        return (xmlSchemaVCheckCVCSimpleType(
            ACTXT_CAST vctxt, NULL,
            type, value, &(inode->val), 1, 1, 0));
    else
        return (xmlSchemaVCheckCVCSimpleType(
            ACTXT_CAST vctxt, NULL,
            type, value, NULL, 1, 0, 0));
}



/* 
* Process END of element.
*/
static int
xmlSchemaValidatorPopElem(xmlSchemaValidCtxtPtr vctxt)
{
    int ret = 0;
    xmlSchemaNodeInfoPtr inode = vctxt->inode;

    if (vctxt->nbAttrInfos != 0)
        xmlSchemaClearAttrInfos(vctxt);
    if (inode->flags & XML_SCHEMA_NODE_INFO_ERR_NOT_EXPECTED) {
        /*
        * This element was not expected;
        * we will not validate child elements of broken parents.
        * Skip validation of all content of the parent.
        */
        vctxt->skipDepth = vctxt->depth -1;
        goto end_elem;
    }    
    if ((inode->typeDef == NULL) ||
        (inode->flags & XML_SCHEMA_NODE_INFO_ERR_BAD_TYPE)) {
        /*
        * 1. the type definition might be missing if the element was
        *    error prone
        * 2. it might be abstract.
        */
        goto end_elem;
    }
    /*
    * Check the content model.
    */
    if ((inode->typeDef->contentType == XML_SCHEMA_CONTENT_MIXED) ||
        (inode->typeDef->contentType == XML_SCHEMA_CONTENT_ELEMENTS)) {

        /*
        * Workaround for "anyType".
        */
        if (inode->typeDef->builtInType == XML_SCHEMAS_ANYTYPE)
            goto character_content;                     
        
        if ((inode->flags & XML_SCHEMA_ELEM_INFO_ERR_BAD_CONTENT) == 0) {
            xmlChar *values[10];
            int terminal, nbval = 10, nbneg;

            if (inode->regexCtxt == NULL) {
                /*
                * Create the regex context.
                */
                inode->regexCtxt =
                    xmlRegNewExecCtxt(inode->typeDef->contModel,
                    (xmlRegExecCallbacks) xmlSchemaVContentModelCallback,
                    vctxt);
                if (inode->regexCtxt == NULL) {
                    VERROR_INT("xmlSchemaValidatorPopElem",
                        "failed to create a regex context");
                    goto internal_error;
                }
#ifdef DEBUG_AUTOMATA
                xmlGenericError(xmlGenericErrorContext,
                    "AUTOMATON create on '%s'\n", inode->localName);
#endif      
            }
            /*
            * Get hold of the still expected content, since a further
            * call to xmlRegExecPushString() will loose this information.
            */ 
            xmlRegExecNextValues(inode->regexCtxt,
                &nbval, &nbneg, &values[0], &terminal);
            ret = xmlRegExecPushString(inode->regexCtxt, NULL, NULL);
            if (ret <= 0) {             
                /*
                * Still missing something.
                */
                ret = 1;
                inode->flags |=
                    XML_SCHEMA_ELEM_INFO_ERR_BAD_CONTENT;
                xmlSchemaComplexTypeErr(ACTXT_CAST vctxt,
                    XML_SCHEMAV_ELEMENT_CONTENT, NULL, NULL,
                    "Missing child element(s)",
                    nbval, nbneg, values);
#ifdef DEBUG_AUTOMATA
                xmlGenericError(xmlGenericErrorContext,
                    "AUTOMATON missing ERROR on '%s'\n",
                    inode->localName);
#endif
            } else {
                /*
                * Content model is satisfied.
                */
                ret = 0;
#ifdef DEBUG_AUTOMATA
                xmlGenericError(xmlGenericErrorContext,
                    "AUTOMATON succeeded on '%s'\n",
                    inode->localName);
#endif
            }

        }
    }
    if (inode->typeDef->contentType == XML_SCHEMA_CONTENT_ELEMENTS)
        goto end_elem;

character_content:

    if (vctxt->value != NULL) {
        xmlSchemaFreeValue(vctxt->value);
        vctxt->value = NULL;
    }
    /*
    * Check character content.
    */
    if (inode->decl == NULL) {
        /*
        * Speedup if no declaration exists.
        */
        if (WXS_IS_SIMPLE(inode->typeDef)) {        
            ret = xmlSchemaVCheckINodeDataType(vctxt,
                inode, inode->typeDef, inode->value);
        } else if (WXS_HAS_SIMPLE_CONTENT(inode->typeDef)) {
            ret = xmlSchemaVCheckINodeDataType(vctxt,
                inode, inode->typeDef->contentTypeDef,
                inode->value);
        }               
        if (ret < 0) {
            VERROR_INT("xmlSchemaValidatorPopElem",
                "calling xmlSchemaVCheckCVCSimpleType()");
            goto internal_error;
        }
        goto end_elem;
    }
    /*
    * cvc-elt (3.3.4) : 5 
    * The appropriate case among the following must be true:
    */
    /*
    * cvc-elt (3.3.4) : 5.1 
    * If the declaration has a {value constraint}, 
    * the item has neither element nor character [children] and 
    * clause 3.2 has not applied, then all of the following must be true:
    */
    if ((inode->decl->value != NULL) &&
        (inode->flags & XML_SCHEMA_ELEM_INFO_EMPTY) && 
        (! INODE_NILLED(inode))) {
        /*
        * cvc-elt (3.3.4) : 5.1.1 
        * If the ·actual type definition· is a ·local type definition·
        * then the canonical lexical representation of the {value constraint}
        * value must be a valid default for the ·actual type definition· as 
        * defined in Element Default Valid (Immediate) (§3.3.6). 
        */
        /* 
        * NOTE: 'local' above means types acquired by xsi:type.
        * NOTE: Although the *canonical* value is stated, it is not
        * relevant if canonical or not. Additionally XML Schema 1.1
        * will removed this requirement as well.
        */
        if (inode->flags & XML_SCHEMA_ELEM_INFO_LOCAL_TYPE) {

            ret = xmlSchemaCheckCOSValidDefault(vctxt,
                inode->decl->value, &(inode->val));
            if (ret != 0) {
                if (ret < 0) {
                    VERROR_INT("xmlSchemaValidatorPopElem",
                        "calling xmlSchemaCheckCOSValidDefault()");
                    goto internal_error;
                }
                goto end_elem;
            }
            /*
            * Stop here, to avoid redundant validation of the value
            * (see following).
            */
            goto default_psvi;
        }       
        /*
        * cvc-elt (3.3.4) : 5.1.2 
        * The element information item with the canonical lexical 
        * representation of the {value constraint} value used as its 
        * ·normalized value· must be ·valid· with respect to the 
        * ·actual type definition· as defined by Element Locally Valid (Type)
        * (§3.3.4).
        */          
        if (WXS_IS_SIMPLE(inode->typeDef)) {
            ret = xmlSchemaVCheckINodeDataType(vctxt,
                inode, inode->typeDef, inode->decl->value);
        } else if (WXS_HAS_SIMPLE_CONTENT(inode->typeDef)) {
            ret = xmlSchemaVCheckINodeDataType(vctxt,
                inode, inode->typeDef->contentTypeDef,
                inode->decl->value);        
        }
        if (ret != 0) {
            if (ret < 0) {
                VERROR_INT("xmlSchemaValidatorPopElem",
                    "calling xmlSchemaVCheckCVCSimpleType()");
                goto internal_error;
            }
            goto end_elem;
        }

default_psvi:
        /*
        * PSVI: Create a text node on the instance element.
        */
        if ((vctxt->options & XML_SCHEMA_VAL_VC_I_CREATE) &&
            (inode->node != NULL)) {
            xmlNodePtr textChild;
            xmlChar *normValue;
            /*
            * VAL TODO: Normalize the value.
            */      
            normValue = xmlSchemaNormalizeValue(inode->typeDef,
                inode->decl->value);
            if (normValue != NULL) {
                textChild = xmlNewText(BAD_CAST normValue);
                xmlFree(normValue);
            } else
                textChild = xmlNewText(inode->decl->value);
            if (textChild == NULL) {
                VERROR_INT("xmlSchemaValidatorPopElem",
                    "calling xmlNewText()");
                goto internal_error;
            } else
                xmlAddChild(inode->node, textChild);        
        }
        
    } else if (! INODE_NILLED(inode)) { 
        /*
        * 5.2.1 The element information item must be ·valid· with respect 
        * to the ·actual type definition· as defined by Element Locally 
        * Valid (Type) (§3.3.4).
        */      
        if (WXS_IS_SIMPLE(inode->typeDef)) {
             /*
            * SPEC (cvc-type) (3.1)
            * "If the type definition is a simple type definition, ..."
            * (3.1.3) "If clause 3.2 of Element Locally Valid
            * (Element) (§3.3.4) did not apply, then the ·normalized value·
            * must be ·valid· with respect to the type definition as defined
            * by String Valid (§3.14.4).
            */      
            ret = xmlSchemaVCheckINodeDataType(vctxt,
                    inode, inode->typeDef, inode->value);
        } else if (WXS_HAS_SIMPLE_CONTENT(inode->typeDef)) {
            /*
            * SPEC (cvc-type) (3.2) "If the type definition is a complex type
            * definition, then the element information item must be
            * ·valid· with respect to the type definition as per
            * Element Locally Valid (Complex Type) (§3.4.4);"
            *
            * SPEC (cvc-complex-type) (2.2)
            * "If the {content type} is a simple type definition, ... 
            * the ·normalized value· of the element information item is
            * ·valid· with respect to that simple type definition as
            * defined by String Valid (§3.14.4)."
            */
            ret = xmlSchemaVCheckINodeDataType(vctxt,
                inode, inode->typeDef->contentTypeDef, inode->value);
        }       
        if (ret != 0) {
            if (ret < 0) {
                VERROR_INT("xmlSchemaValidatorPopElem",
                    "calling xmlSchemaVCheckCVCSimpleType()");
                goto internal_error;
            }
            goto end_elem;
        }
        /*
        * 5.2.2 If there is a fixed {value constraint} and clause 3.2 has 
        * not applied, all of the following must be true:
        */
        if ((inode->decl->value != NULL) &&
            (inode->decl->flags & XML_SCHEMAS_ELEM_FIXED)) {

            /*
            * TODO: We will need a computed value, when comparison is
            * done on computed values.
            */
            /*
            * 5.2.2.1 The element information item must have no element 
            * information item [children].
            */
            if (inode->flags &
                    XML_SCHEMA_ELEM_INFO_HAS_ELEM_CONTENT) {
                ret = XML_SCHEMAV_CVC_ELT_5_2_2_1;
                VERROR(ret, NULL,
                    "The content must not containt element nodes since "
                    "there is a fixed value constraint");
                goto end_elem;
            } else {
                /*
                * 5.2.2.2 The appropriate case among the following must 
                * be true:
                */              
                if (WXS_HAS_MIXED_CONTENT(inode->typeDef)) {
                    /*
                    * 5.2.2.2.1 If the {content type} of the ·actual type 
                    * definition· is mixed, then the *initial value* of the 
                    * item must match the canonical lexical representation 
                    * of the {value constraint} value.
                    *
                    * ... the *initial value* of an element information 
                    * item is the string composed of, in order, the 
                    * [character code] of each character information item in 
                    * the [children] of that element information item.
                    */             
                    if (! xmlStrEqual(inode->value, inode->decl->value)){
                        /* 
                        * VAL TODO: Report invalid & expected values as well.
                        * VAL TODO: Implement the canonical stuff.
                        */
                        ret = XML_SCHEMAV_CVC_ELT_5_2_2_2_1;
                        xmlSchemaCustomErr(ACTXT_CAST vctxt, 
                            ret, NULL, NULL,
                            "The initial value '%s' does not match the fixed "
                            "value constraint '%s'",
                            inode->value, inode->decl->value);
                        goto end_elem;
                    }
                } else if (WXS_HAS_SIMPLE_CONTENT(inode->typeDef)) {
                    /*
                    * 5.2.2.2.2 If the {content type} of the ·actual type 
                    * definition· is a simple type definition, then the 
                    * *actual value* of the item must match the canonical 
                    * lexical representation of the {value constraint} value.
                    */
                    /*
                    * VAL TODO: *actual value* is the normalized value, impl.
                    *           this.
                    * VAL TODO: Report invalid & expected values as well.
                    * VAL TODO: Implement a comparison with the computed values.
                    */
                    if (! xmlStrEqual(inode->value,
                            inode->decl->value)) {
                        ret = XML_SCHEMAV_CVC_ELT_5_2_2_2_2;
                        xmlSchemaCustomErr(ACTXT_CAST vctxt,
                            ret, NULL, NULL,
                            "The actual value '%s' does not match the fixed "
                            "value constraint '%s'", 
                            inode->value,
                            inode->decl->value);
                        goto end_elem;
                    }               
                }
            }       
        }
    }
    
end_elem:
    if (vctxt->depth < 0) {
        /* TODO: raise error? */
        return (0);
    }
    if (vctxt->depth == vctxt->skipDepth)
        vctxt->skipDepth = -1;
    /*
    * Evaluate the history of XPath state objects.
    */    
    if (inode->appliedXPath &&
        (xmlSchemaXPathProcessHistory(vctxt, vctxt->depth) == -1))
        goto internal_error;
    /*
    * MAYBE TODO:
    * SPEC (6) "The element information item must be ·valid· with
    * respect to each of the {identity-constraint definitions} as per
    * Identity-constraint Satisfied (§3.11.4)."
    */
    /*
    * PSVI TODO: If we expose IDC node-tables via PSVI then the tables
    *   need to be built in any case.
    *   We will currently build IDC node-tables and bubble them only if
    *   keyrefs do exist.
    */
    
    /*
    * Add the current IDC target-nodes to the IDC node-tables.
    */
    if ((inode->idcMatchers != NULL) &&
        (vctxt->hasKeyrefs || vctxt->createIDCNodeTables))
    {
        if (xmlSchemaIDCFillNodeTables(vctxt, inode) == -1)
            goto internal_error;
    }
    /*
    * Validate IDC keyrefs.
    */
    if (vctxt->inode->hasKeyrefs)
        if (xmlSchemaCheckCVCIDCKeyRef(vctxt) == -1)
            goto internal_error;
    /*
    * Merge/free the IDC table.
    */
    if (inode->idcTable != NULL) {
#ifdef DEBUG_IDC_NODE_TABLE
        xmlSchemaDebugDumpIDCTable(stdout,
            inode->nsName,
            inode->localName,
            inode->idcTable);
#endif
        if ((vctxt->depth > 0) &&
            (vctxt->hasKeyrefs || vctxt->createIDCNodeTables))
        {
            /*
            * Merge the IDC node table with the table of the parent node.
            */
            if (xmlSchemaBubbleIDCNodeTables(vctxt) == -1)
                goto internal_error;
        }       
    }
    /*
    * Clear the current ielem.
    * VAL TODO: Don't free the PSVI IDC tables if they are
    * requested for the PSVI.
    */
    xmlSchemaClearElemInfo(vctxt, inode);
    /*
    * Skip further processing if we are on the validation root.
    */
    if (vctxt->depth == 0) {
        vctxt->depth--;
        vctxt->inode = NULL;
        return (0);
    }
    /*
    * Reset the keyrefDepth if needed.
    */
    if (vctxt->aidcs != NULL) {
        xmlSchemaIDCAugPtr aidc = vctxt->aidcs;
        do {
            if (aidc->keyrefDepth == vctxt->depth) {
                /*
                * A 'keyrefDepth' of a key/unique IDC matches the current
                * depth, this means that we are leaving the scope of the
                * top-most keyref IDC which refers to this IDC.
                */
                aidc->keyrefDepth = -1;
            }
            aidc = aidc->next;
        } while (aidc != NULL);
    }
    vctxt->depth--;        
    vctxt->inode = vctxt->elemInfos[vctxt->depth];
    /*
    * VAL TODO: 7 If the element information item is the ·validation root·, it must be 
    * ·valid· per Validation Root Valid (ID/IDREF) (§3.3.4).
    */
    return (ret);

internal_error:
    vctxt->err = -1;
    return (-1);
}

/*
* 3.4.4 Complex Type Definition Validation Rules
* Validation Rule: Element Locally Valid (Complex Type) (cvc-complex-type)
*/
static int
xmlSchemaValidateChildElem(xmlSchemaValidCtxtPtr vctxt)
{
    xmlSchemaNodeInfoPtr pielem;
    xmlSchemaTypePtr ptype;
    int ret = 0;

    if (vctxt->depth <= 0) {
        VERROR_INT("xmlSchemaValidateChildElem",
            "not intended for the validation root");
        return (-1);
    }
    pielem = vctxt->elemInfos[vctxt->depth -1];
    if (pielem->flags & XML_SCHEMA_ELEM_INFO_EMPTY)
        pielem->flags ^= XML_SCHEMA_ELEM_INFO_EMPTY;
    /*
    * Handle 'nilled' elements.
    */
    if (INODE_NILLED(pielem)) {
        /*
        * SPEC (cvc-elt) (3.3.4) : (3.2.1)
        */
        ACTIVATE_PARENT_ELEM;
        ret = XML_SCHEMAV_CVC_ELT_3_2_1;
        VERROR(ret, NULL,
            "Neither character nor element content is allowed, "
            "because the element was 'nilled'");
        ACTIVATE_ELEM;
        goto unexpected_elem;
    }

    ptype = pielem->typeDef;

    if (ptype->builtInType == XML_SCHEMAS_ANYTYPE) {
        /*
        * Workaround for "anyType": we have currently no content model
        * assigned for "anyType", so handle it explicitly.
        * "anyType" has an unbounded, lax "any" wildcard.
        */
        vctxt->inode->decl = xmlSchemaGetElem(vctxt->schema,
            vctxt->inode->localName,
            vctxt->inode->nsName);

        if (vctxt->inode->decl == NULL) {
            xmlSchemaAttrInfoPtr iattr;
            /*
            * Process "xsi:type".
            * SPEC (cvc-assess-elt) (1.2.1.2.1) - (1.2.1.2.3)
            */
            iattr = xmlSchemaGetMetaAttrInfo(vctxt,
                XML_SCHEMA_ATTR_INFO_META_XSI_TYPE);
            if (iattr != NULL) {
                ret = xmlSchemaProcessXSIType(vctxt, iattr,
                    &(vctxt->inode->typeDef), NULL);
                if (ret != 0) {
                    if (ret == -1) {
                        VERROR_INT("xmlSchemaValidateChildElem",
                            "calling xmlSchemaProcessXSIType() to "
                            "process the attribute 'xsi:nil'");
                        return (-1);
                    }
                    return (ret);
                }
            } else {
                 /*
                 * Fallback to "anyType".
                 *
                 * SPEC (cvc-assess-elt)
                 * "If the item cannot be ·strictly assessed·, [...]
                 * an element information item's schema validity may be laxly
                 * assessed if its ·context-determined declaration· is not
                 * skip by ·validating· with respect to the ·ur-type
                 * definition· as per Element Locally Valid (Type) (§3.3.4)."
                */
                vctxt->inode->typeDef =
                    xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYTYPE);
            }
        }
        return (0);
    }

    switch (ptype->contentType) {
        case XML_SCHEMA_CONTENT_EMPTY:
            /*
            * SPEC (2.1) "If the {content type} is empty, then the
            * element information item has no character or element
            * information item [children]."
            */
            ACTIVATE_PARENT_ELEM
            ret = XML_SCHEMAV_CVC_COMPLEX_TYPE_2_1;
            VERROR(ret, NULL,
                "Element content is not allowed, "
                "because the content type is empty");
            ACTIVATE_ELEM
            goto unexpected_elem;
            break;

        case XML_SCHEMA_CONTENT_MIXED:
        case XML_SCHEMA_CONTENT_ELEMENTS: {
            xmlRegExecCtxtPtr regexCtxt;
            xmlChar *values[10];
            int terminal, nbval = 10, nbneg;

            /* VAL TODO: Optimized "anyType" validation.*/

            if (ptype->contModel == NULL) {
                VERROR_INT("xmlSchemaValidateChildElem",
                    "type has elem content but no content model");
                return (-1);
            }
            /*
            * Safety belf for evaluation if the cont. model was already
            * examined to be invalid.
            */
            if (pielem->flags & XML_SCHEMA_ELEM_INFO_ERR_BAD_CONTENT) {
                VERROR_INT("xmlSchemaValidateChildElem",
                    "validating elem, but elem content is already invalid");
                return (-1);
            }

            regexCtxt = pielem->regexCtxt;
            if (regexCtxt == NULL) {
                /*
                * Create the regex context.
                */
                regexCtxt = xmlRegNewExecCtxt(ptype->contModel,
                    (xmlRegExecCallbacks) xmlSchemaVContentModelCallback,
                    vctxt);
                if (regexCtxt == NULL) {
                    VERROR_INT("xmlSchemaValidateChildElem",
                        "failed to create a regex context");
                    return (-1);
                }
                pielem->regexCtxt = regexCtxt;
#ifdef DEBUG_AUTOMATA
                xmlGenericError(xmlGenericErrorContext, "AUTOMATA create on '%s'\n",
                    pielem->localName);
#endif
            }

            /*
            * SPEC (2.4) "If the {content type} is element-only or mixed,
            * then the sequence of the element information item's
            * element information item [children], if any, taken in
            * order, is ·valid· with respect to the {content type}'s
            * particle, as defined in Element Sequence Locally Valid
            * (Particle) (§3.9.4)."
            */
            ret = xmlRegExecPushString2(regexCtxt,
                vctxt->inode->localName,
                vctxt->inode->nsName,
                vctxt->inode);
#ifdef DEBUG_AUTOMATA
            if (ret < 0)
                xmlGenericError(xmlGenericErrorContext,
                "AUTOMATON push ERROR for '%s' on '%s'\n",
                vctxt->inode->localName, pielem->localName);
            else
                xmlGenericError(xmlGenericErrorContext,
                "AUTOMATON push OK for '%s' on '%s'\n",
                vctxt->inode->localName, pielem->localName);
#endif
            if (vctxt->err == XML_SCHEMAV_INTERNAL) {
                VERROR_INT("xmlSchemaValidateChildElem",
                    "calling xmlRegExecPushString2()");
                return (-1);
            }
            if (ret < 0) {
                xmlRegExecErrInfo(regexCtxt, NULL, &nbval, &nbneg,
                    &values[0], &terminal);
                xmlSchemaComplexTypeErr(ACTXT_CAST vctxt,
                    XML_SCHEMAV_ELEMENT_CONTENT, NULL,NULL,
                    "This element is not expected",
                    nbval, nbneg, values);
                ret = vctxt->err;
                goto unexpected_elem;
            } else
                ret = 0;
        }
            break;
        case XML_SCHEMA_CONTENT_SIMPLE:
        case XML_SCHEMA_CONTENT_BASIC:
            ACTIVATE_PARENT_ELEM
            if (WXS_IS_COMPLEX(ptype)) {
                /*
                * SPEC (cvc-complex-type) (2.2)
                * "If the {content type} is a simple type definition, then
                * the element information item has no element information
                * item [children], ..."
                */
                ret = XML_SCHEMAV_CVC_COMPLEX_TYPE_2_2;
                VERROR(ret, NULL, "Element content is not allowed, "
                    "because the content type is a simple type definition");
            } else {
                /*
                * SPEC (cvc-type) (3.1.2) "The element information item must
                * have no element information item [children]."
                */
                ret = XML_SCHEMAV_CVC_TYPE_3_1_2;
                VERROR(ret, NULL, "Element content is not allowed, "
                    "because the type definition is simple");
            }
            ACTIVATE_ELEM
            ret = vctxt->err;
            goto unexpected_elem;
            break;

        default:
            break;
    }
    return (ret);
unexpected_elem:
    /*
    * Pop this element and set the skipDepth to skip
    * all further content of the parent element.
    */
    vctxt->skipDepth = vctxt->depth;
    vctxt->inode->flags |= XML_SCHEMA_NODE_INFO_ERR_NOT_EXPECTED;
    pielem->flags |= XML_SCHEMA_ELEM_INFO_ERR_BAD_CONTENT;
    return (ret);
}

#define XML_SCHEMA_PUSH_TEXT_PERSIST 1
#define XML_SCHEMA_PUSH_TEXT_CREATED 2
#define XML_SCHEMA_PUSH_TEXT_VOLATILE 3

static int
xmlSchemaVPushText(xmlSchemaValidCtxtPtr vctxt,
                  int nodeType, const xmlChar *value, int len,
                  int mode, int *consumed)
{
    /*
    * Unfortunately we have to duplicate the text sometimes.
    * OPTIMIZE: Maybe we could skip it, if:
    *   1. content type is simple
    *   2. whitespace is "collapse"
    *   3. it consists of whitespace only
    *
    * Process character content.
    */
    if (consumed != NULL)
        *consumed = 0;
    if (INODE_NILLED(vctxt->inode)) {
        /* 
        * SPEC cvc-elt (3.3.4 - 3.2.1)
        * "The element information item must have no character or
        * element information item [children]."
        */
        VERROR(XML_SCHEMAV_CVC_ELT_3_2_1, NULL,
            "Neither character nor element content is allowed "
            "because the element is 'nilled'");
        return (vctxt->err);
    }
    /*
    * SPEC (2.1) "If the {content type} is empty, then the
    * element information item has no character or element
    * information item [children]."
    */
    if (vctxt->inode->typeDef->contentType ==
            XML_SCHEMA_CONTENT_EMPTY) {    
        VERROR(XML_SCHEMAV_CVC_COMPLEX_TYPE_2_1, NULL,
            "Character content is not allowed, "
            "because the content type is empty");
        return (vctxt->err);
    }

    if (vctxt->inode->typeDef->contentType ==
            XML_SCHEMA_CONTENT_ELEMENTS) {
        if ((nodeType != XML_TEXT_NODE) ||
            (! xmlSchemaIsBlank((xmlChar *) value, len))) {
            /* 
            * SPEC cvc-complex-type (2.3) 
            * "If the {content type} is element-only, then the 
            * element information item has no character information 
            * item [children] other than those whose [character 
            * code] is defined as a white space in [XML 1.0 (Second 
            * Edition)]."
            */
            VERROR(XML_SCHEMAV_CVC_COMPLEX_TYPE_2_3, NULL,
                "Character content other than whitespace is not allowed "
                "because the content type is 'element-only'");
            return (vctxt->err);
        }
        return (0);
    }
    
    if ((value == NULL) || (value[0] == 0))
        return (0);
    /*
    * Save the value.
    * NOTE that even if the content type is *mixed*, we need the
    * *initial value* for default/fixed value constraints.
    */
    if ((vctxt->inode->typeDef->contentType == XML_SCHEMA_CONTENT_MIXED) &&
        ((vctxt->inode->decl == NULL) ||
        (vctxt->inode->decl->value == NULL)))
        return (0);
    
    if (vctxt->inode->value == NULL) {
        /*
        * Set the value.
        */
        switch (mode) {
            case XML_SCHEMA_PUSH_TEXT_PERSIST:
                /*
                * When working on a tree.
                */
                vctxt->inode->value = value;
                break;
            case XML_SCHEMA_PUSH_TEXT_CREATED:
                /*
                * When working with the reader.
                * The value will be freed by the element info.
                */
                vctxt->inode->value = value;
                if (consumed != NULL)
                    *consumed = 1;
                vctxt->inode->flags |=
                    XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES;
                break;
            case XML_SCHEMA_PUSH_TEXT_VOLATILE:
                /*
                * When working with SAX.
                * The value will be freed by the element info.
                */
                if (len != -1)
                    vctxt->inode->value = BAD_CAST xmlStrndup(value, len);
                else
                    vctxt->inode->value = BAD_CAST xmlStrdup(value);
                vctxt->inode->flags |=
                    XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES;
                break;
            default:
                break;
        }
    } else {
        if (len < 0)
            len = xmlStrlen(value);
        /*
        * Concat the value.
        */      
        if (vctxt->inode->flags & XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES) {
            vctxt->inode->value = BAD_CAST xmlStrncat(
                (xmlChar *) vctxt->inode->value, value, len);
        } else {
            vctxt->inode->value =
                BAD_CAST xmlStrncatNew(vctxt->inode->value, value, len);
            vctxt->inode->flags |= XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES;
        }
    }   

    return (0);
}

static int
xmlSchemaValidateElem(xmlSchemaValidCtxtPtr vctxt)
{
    int ret = 0;

    if ((vctxt->skipDepth != -1) &&
        (vctxt->depth >= vctxt->skipDepth)) {
        VERROR_INT("xmlSchemaValidateElem",
            "in skip-state");
        goto internal_error;
    }
    if (vctxt->xsiAssemble) {
        /* 
        * We will stop validation if there was an error during
        * dynamic schema construction.
        * Note that we simply set @skipDepth to 0, this could
        * mean that a streaming document via SAX would be
        * still read to the end but it won't be validated any more.
        * TODO: If we are sure how to stop the validation at once
        *   for all input scenarios, then this should be changed to
        *   instantly stop the validation.
        */
        ret = xmlSchemaAssembleByXSI(vctxt);
        if (ret != 0) {
            if (ret == -1)
                goto internal_error;
            vctxt->skipDepth = 0;
            return(ret);
        }
    }
    if (vctxt->depth > 0) {
        /*
        * Validate this element against the content model
        * of the parent.
        */
        ret = xmlSchemaValidateChildElem(vctxt);
        if (ret != 0) {
            if (ret < 0) {
                VERROR_INT("xmlSchemaValidateElem",
                    "calling xmlSchemaStreamValidateChildElement()");
                goto internal_error;
            }
            goto exit;
        }
        if (vctxt->depth == vctxt->skipDepth)
            goto exit;
        if ((vctxt->inode->decl == NULL) &&
            (vctxt->inode->typeDef == NULL)) {
            VERROR_INT("xmlSchemaValidateElem",
                "the child element was valid but neither the "
                "declaration nor the type was set");
            goto internal_error;
        }
    } else {
        /*
        * Get the declaration of the validation root.
        */
        vctxt->inode->decl = xmlSchemaGetElem(vctxt->schema,
            vctxt->inode->localName,
            vctxt->inode->nsName);
        if (vctxt->inode->decl == NULL) {
            ret = XML_SCHEMAV_CVC_ELT_1;
            VERROR(ret, NULL,
                "No matching global declaration available "
                "for the validation root");
            goto exit;
        }
    }

    if (vctxt->inode->decl == NULL)
        goto type_validation;

    if (vctxt->inode->decl->type == XML_SCHEMA_TYPE_ANY) {
        int skip;
        /*
        * Wildcards.
        */
        ret = xmlSchemaValidateElemWildcard(vctxt, &skip);
        if (ret != 0) {
            if (ret < 0) {
                VERROR_INT("xmlSchemaValidateElem",
                    "calling xmlSchemaValidateElemWildcard()");
                goto internal_error;
            }
            goto exit;
        }
        if (skip) {
            vctxt->skipDepth = vctxt->depth;
            goto exit;
        }
        /*
        * The declaration might be set by the wildcard validation,
        * when the processContents is "lax" or "strict".
        */
        if (vctxt->inode->decl->type != XML_SCHEMA_TYPE_ELEMENT) {
            /*
            * Clear the "decl" field to not confuse further processing.
            */
            vctxt->inode->decl = NULL;
            goto type_validation;
        }
    }
    /*
    * Validate against the declaration.
    */
    ret = xmlSchemaValidateElemDecl(vctxt);
    if (ret != 0) {
        if (ret < 0) {
            VERROR_INT("xmlSchemaValidateElem",
                "calling xmlSchemaValidateElemDecl()");
            goto internal_error;
        }
        goto exit;
    }
    /*
    * Validate against the type definition.
    */
type_validation:

    if (vctxt->inode->typeDef == NULL) {
        vctxt->inode->flags |= XML_SCHEMA_NODE_INFO_ERR_BAD_TYPE;
        ret = XML_SCHEMAV_CVC_TYPE_1;
        VERROR(ret, NULL,
            "The type definition is absent");
        goto exit;
    }    
    if (vctxt->inode->typeDef->flags & XML_SCHEMAS_TYPE_ABSTRACT) {
        vctxt->inode->flags |= XML_SCHEMA_NODE_INFO_ERR_BAD_TYPE;
        ret = XML_SCHEMAV_CVC_TYPE_2;
            VERROR(ret, NULL,
            "The type definition is abstract"); 
        goto exit;
    }
    /*
    * Evaluate IDCs. Do it here, since new IDC matchers are registered
    * during validation against the declaration. This must be done
    * _before_ attribute validation.
    */
    if (vctxt->xpathStates != NULL) {
        ret = xmlSchemaXPathEvaluate(vctxt, XML_ELEMENT_NODE);
        vctxt->inode->appliedXPath = 1;
        if (ret == -1) {
            VERROR_INT("xmlSchemaValidateElem",
                "calling xmlSchemaXPathEvaluate()");
            goto internal_error;
        }
    }
    /*
    * Validate attributes.
    */
    if (WXS_IS_COMPLEX(vctxt->inode->typeDef)) {
        if ((vctxt->nbAttrInfos != 0) ||
            (vctxt->inode->typeDef->attrUses != NULL)) {

            ret = xmlSchemaVAttributesComplex(vctxt);
        }
    } else if (vctxt->nbAttrInfos != 0) {

        ret = xmlSchemaVAttributesSimple(vctxt);
    }
    /*
    * Clear registered attributes.
    */
    if (vctxt->nbAttrInfos != 0)
        xmlSchemaClearAttrInfos(vctxt);
    if (ret == -1) {
        VERROR_INT("xmlSchemaValidateElem",
            "calling attributes validation");
        goto internal_error;
    }
    /*
    * Don't return an error if attributes are invalid on purpose.
    */
    ret = 0;

exit:
    if (ret != 0)
        vctxt->skipDepth = vctxt->depth;
    return (ret);
internal_error:
    return (-1);
}

#ifdef XML_SCHEMA_READER_ENABLED
static int
xmlSchemaVReaderWalk(xmlSchemaValidCtxtPtr vctxt)
{
    const int WHTSP = 13, SIGN_WHTSP = 14, END_ELEM = 15;
    int depth, nodeType, ret = 0, consumed;
    xmlSchemaNodeInfoPtr ielem;

    vctxt->depth = -1;
    ret = xmlTextReaderRead(vctxt->reader);
    /*
    * Move to the document element.
    */
    while (ret == 1) {
        nodeType = xmlTextReaderNodeType(vctxt->reader);
        if (nodeType == XML_ELEMENT_NODE)
            goto root_found;
        ret = xmlTextReaderRead(vctxt->reader);
    }
    goto exit;

root_found:

    do {
        depth = xmlTextReaderDepth(vctxt->reader);
        nodeType = xmlTextReaderNodeType(vctxt->reader);

        if (nodeType == XML_ELEMENT_NODE) {
            
            vctxt->depth++;
            if (xmlSchemaValidatorPushElem(vctxt) == -1) {
                VERROR_INT("xmlSchemaVReaderWalk",
                    "calling xmlSchemaValidatorPushElem()");
                goto internal_error;
            }
            ielem = vctxt->inode;
            ielem->localName = xmlTextReaderLocalName(vctxt->reader);
            ielem->nsName = xmlTextReaderNamespaceUri(vctxt->reader);
            ielem->flags |= XML_SCHEMA_NODE_INFO_FLAG_OWNED_NAMES;
            /*
            * Is the element empty?
            */
            ret = xmlTextReaderIsEmptyElement(vctxt->reader);
            if (ret == -1) {
                VERROR_INT("xmlSchemaVReaderWalk",
                    "calling xmlTextReaderIsEmptyElement()");
                goto internal_error;
            }
            if (ret) {
                ielem->flags |= XML_SCHEMA_ELEM_INFO_EMPTY;
            }
            /*
            * Register attributes.
            */
            vctxt->nbAttrInfos = 0;
            ret = xmlTextReaderMoveToFirstAttribute(vctxt->reader);
            if (ret == -1) {
                VERROR_INT("xmlSchemaVReaderWalk",
                    "calling xmlTextReaderMoveToFirstAttribute()");
                goto internal_error;
            }
            if (ret == 1) {
                do {
                    /*
                    * VAL TODO: How do we know that the reader works on a
                    * node tree, to be able to pass a node here?
                    */
                    if (xmlSchemaValidatorPushAttribute(vctxt, NULL,
                        (const xmlChar *) xmlTextReaderLocalName(vctxt->reader),
                        xmlTextReaderNamespaceUri(vctxt->reader), 1,
                        xmlTextReaderValue(vctxt->reader), 1) == -1) {

                        VERROR_INT("xmlSchemaVReaderWalk",
                            "calling xmlSchemaValidatorPushAttribute()");
                        goto internal_error;
                    }
                    ret = xmlTextReaderMoveToNextAttribute(vctxt->reader);
                    if (ret == -1) {
                        VERROR_INT("xmlSchemaVReaderWalk",
                            "calling xmlTextReaderMoveToFirstAttribute()");
                        goto internal_error;
                    }
                } while (ret == 1);
                /*
                * Back to element position.
                */
                ret = xmlTextReaderMoveToElement(vctxt->reader);
                if (ret == -1) {
                    VERROR_INT("xmlSchemaVReaderWalk",
                        "calling xmlTextReaderMoveToElement()");
                    goto internal_error;
                }
            }
            /*
            * Validate the element.
            */
            ret= xmlSchemaValidateElem(vctxt);
            if (ret != 0) {
                if (ret == -1) {
                    VERROR_INT("xmlSchemaVReaderWalk",
                        "calling xmlSchemaValidateElem()");
                    goto internal_error;
                }
                goto exit;
            }
            if (vctxt->depth == vctxt->skipDepth) {
                int curDepth;
                /*
                * Skip all content.
                */
                if ((ielem->flags & XML_SCHEMA_ELEM_INFO_EMPTY) == 0) {
                    ret = xmlTextReaderRead(vctxt->reader);
                    curDepth = xmlTextReaderDepth(vctxt->reader);
                    while ((ret == 1) && (curDepth != depth)) {
                        ret = xmlTextReaderRead(vctxt->reader);
                        curDepth = xmlTextReaderDepth(vctxt->reader);
                    }
                    if (ret < 0) {
                        /*
                        * VAL TODO: A reader error occured; what to do here?
                        */
                        ret = 1;
                        goto exit;
                    }
                }
                goto leave_elem;
            }
            /*
            * READER VAL TODO: Is an END_ELEM really never called
            * if the elem is empty?
            */
            if (ielem->flags & XML_SCHEMA_ELEM_INFO_EMPTY)
                goto leave_elem;
        } else if (nodeType == END_ELEM) {
            /*
            * Process END of element.
            */
leave_elem:
            ret = xmlSchemaValidatorPopElem(vctxt);
            if (ret != 0) {
                if (ret < 0) {
                    VERROR_INT("xmlSchemaVReaderWalk",
                        "calling xmlSchemaValidatorPopElem()");
                    goto internal_error;
                }
                goto exit;
            }
            if (vctxt->depth >= 0)
                ielem = vctxt->inode;
            else
                ielem = NULL;
        } else if ((nodeType == XML_TEXT_NODE) ||
            (nodeType == XML_CDATA_SECTION_NODE) ||
            (nodeType == WHTSP) ||
            (nodeType == SIGN_WHTSP)) {
            /*
            * Process character content.
            */
            xmlChar *value;

            if ((nodeType == WHTSP) || (nodeType == SIGN_WHTSP))
                nodeType = XML_TEXT_NODE;

            value = xmlTextReaderValue(vctxt->reader);
            ret = xmlSchemaVPushText(vctxt, nodeType, BAD_CAST value,
                -1, XML_SCHEMA_PUSH_TEXT_CREATED, &consumed);
            if (! consumed)
                xmlFree(value);
            if (ret == -1) {
                VERROR_INT("xmlSchemaVReaderWalk",
                    "calling xmlSchemaVPushText()");
                goto internal_error;
            }
        } else if ((nodeType == XML_ENTITY_NODE) ||
            (nodeType == XML_ENTITY_REF_NODE)) {
            /*
            * VAL TODO: What to do with entities?
            */
            TODO
        }
        /*
        * Read next node.
        */
        ret = xmlTextReaderRead(vctxt->reader);
    } while (ret == 1);

exit:
    return (ret);
internal_error:
    return (-1);
}
#endif

/************************************************************************
 *                                                                      *
 *                      SAX validation handlers                         *
 *                                                                      *
 ************************************************************************/

/*
* Process text content.
*/
static void
xmlSchemaSAXHandleText(void *ctx, 
                       const xmlChar * ch, 
                       int len)
{
    xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) ctx;

    if (vctxt->depth < 0)
        return;
    if ((vctxt->skipDepth != -1) && (vctxt->depth >= vctxt->skipDepth))
        return;
    if (vctxt->inode->flags & XML_SCHEMA_ELEM_INFO_EMPTY)
        vctxt->inode->flags ^= XML_SCHEMA_ELEM_INFO_EMPTY;
    if (xmlSchemaVPushText(vctxt, XML_TEXT_NODE, ch, len,
        XML_SCHEMA_PUSH_TEXT_VOLATILE, NULL) == -1) {
        VERROR_INT("xmlSchemaSAXHandleCDataSection",
            "calling xmlSchemaVPushText()");
        vctxt->err = -1;
        xmlStopParser(vctxt->parserCtxt);
    }
}

/*
* Process CDATA content.
*/
static void
xmlSchemaSAXHandleCDataSection(void *ctx, 
                             const xmlChar * ch, 
                             int len)
{   
    xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) ctx;

    if (vctxt->depth < 0)
        return;
    if ((vctxt->skipDepth != -1) && (vctxt->depth >= vctxt->skipDepth))
        return;
    if (vctxt->inode->flags & XML_SCHEMA_ELEM_INFO_EMPTY)
        vctxt->inode->flags ^= XML_SCHEMA_ELEM_INFO_EMPTY;
    if (xmlSchemaVPushText(vctxt, XML_CDATA_SECTION_NODE, ch, len,
        XML_SCHEMA_PUSH_TEXT_VOLATILE, NULL) == -1) {
        VERROR_INT("xmlSchemaSAXHandleCDataSection",
            "calling xmlSchemaVPushText()");
        vctxt->err = -1;
        xmlStopParser(vctxt->parserCtxt);
    }
}

static void
xmlSchemaSAXHandleReference(void *ctx ATTRIBUTE_UNUSED,
                            const xmlChar * name ATTRIBUTE_UNUSED)
{
    xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) ctx;

    if (vctxt->depth < 0)
        return;
    if ((vctxt->skipDepth != -1) && (vctxt->depth >= vctxt->skipDepth))
        return;
    /* SAX VAL TODO: What to do here? */
    TODO
}

static void
xmlSchemaSAXHandleStartElementNs(void *ctx,
                                 const xmlChar * localname, 
                                 const xmlChar * prefix ATTRIBUTE_UNUSED, 
                                 const xmlChar * URI, 
                                 int nb_namespaces, 
                                 const xmlChar ** namespaces, 
                                 int nb_attributes, 
                                 int nb_defaulted ATTRIBUTE_UNUSED, 
                                 const xmlChar ** attributes)
{  
    xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) ctx;
    int ret;
    xmlSchemaNodeInfoPtr ielem;
    int i, j;
    
    /*
    * SAX VAL TODO: What to do with nb_defaulted?
    */
    /*
    * Skip elements if inside a "skip" wildcard or invalid.
    */
    vctxt->depth++;
    if ((vctxt->skipDepth != -1) && (vctxt->depth >= vctxt->skipDepth))
        return;
    /*
    * Push the element.
    */
    if (xmlSchemaValidatorPushElem(vctxt) == -1) {
        VERROR_INT("xmlSchemaSAXHandleStartElementNs",
            "calling xmlSchemaValidatorPushElem()");
        goto internal_error;
    }
    ielem = vctxt->inode;
    /*
    * TODO: Is this OK?
    */
    ielem->nodeLine = xmlSAX2GetLineNumber(vctxt->parserCtxt);
    ielem->localName = localname;
    ielem->nsName = URI;
    ielem->flags |= XML_SCHEMA_ELEM_INFO_EMPTY;
    /*
    * Register namespaces on the elem info.
    */    
    if (nb_namespaces != 0) {
        /*
        * Although the parser builds its own namespace list,
        * we have no access to it, so we'll use an own one.
        */
        for (i = 0, j = 0; i < nb_namespaces; i++, j += 2) {        
            /*
            * Store prefix and namespace name.
            */     
            if (ielem->nsBindings == NULL) {
                ielem->nsBindings =
                    (const xmlChar **) xmlMalloc(10 *
                        sizeof(const xmlChar *));
                if (ielem->nsBindings == NULL) {
                    xmlSchemaVErrMemory(vctxt,
                        "allocating namespace bindings for SAX validation",
                        NULL);
                    goto internal_error;
                }
                ielem->nbNsBindings = 0;
                ielem->sizeNsBindings = 5;
            } else if (ielem->sizeNsBindings <= ielem->nbNsBindings) {
                ielem->sizeNsBindings *= 2;
                ielem->nsBindings =
                    (const xmlChar **) xmlRealloc(
                        (void *) ielem->nsBindings,
                        ielem->sizeNsBindings * 2 * sizeof(const xmlChar *));
                if (ielem->nsBindings == NULL) {
                    xmlSchemaVErrMemory(vctxt,
                        "re-allocating namespace bindings for SAX validation",
                        NULL);
                    goto internal_error;
                }
            }

            ielem->nsBindings[ielem->nbNsBindings * 2] = namespaces[j];
            if (namespaces[j+1][0] == 0) {
                /*
                * Handle xmlns="".
                */
                ielem->nsBindings[ielem->nbNsBindings * 2 + 1] = NULL;
            } else
                ielem->nsBindings[ielem->nbNsBindings * 2 + 1] =
                    namespaces[j+1];
            ielem->nbNsBindings++;                  
        }
    }
    /*
    * Register attributes.
    * SAX VAL TODO: We are not adding namespace declaration
    * attributes yet.
    */
    if (nb_attributes != 0) {
        xmlChar *value;

        for (j = 0, i = 0; i < nb_attributes; i++, j += 5) {
            /*
            * Duplicate the value.
            */   
            value = xmlStrndup(attributes[j+3],
                attributes[j+4] - attributes[j+3]);
            /*
            * TODO: Set the node line.
            */
            ret = xmlSchemaValidatorPushAttribute(vctxt,
                NULL, ielem->nodeLine, attributes[j], attributes[j+2], 0,
                value, 1);
            if (ret == -1) {
                VERROR_INT("xmlSchemaSAXHandleStartElementNs",
                    "calling xmlSchemaValidatorPushAttribute()");
                goto internal_error;
            }
        }
    }
    /*
    * Validate the element.
    */
    ret = xmlSchemaValidateElem(vctxt);
    if (ret != 0) {
        if (ret == -1) {
            VERROR_INT("xmlSchemaSAXHandleStartElementNs",
                "calling xmlSchemaValidateElem()");
            goto internal_error;
        }
        goto exit;
    }    

exit:
    return;
internal_error:
    vctxt->err = -1;
    xmlStopParser(vctxt->parserCtxt);
    return;
}

static void
xmlSchemaSAXHandleEndElementNs(void *ctx,
                               const xmlChar * localname ATTRIBUTE_UNUSED,
                               const xmlChar * prefix ATTRIBUTE_UNUSED,
                               const xmlChar * URI ATTRIBUTE_UNUSED)
{
    xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) ctx;
    int res;

    /*
    * Skip elements if inside a "skip" wildcard or if invalid.
    */
    if (vctxt->skipDepth != -1) {
        if (vctxt->depth > vctxt->skipDepth) {
            vctxt->depth--;
            return;
        } else
            vctxt->skipDepth = -1;
    }
    /*
    * SAX VAL TODO: Just a temporary check.
    */
    if ((!xmlStrEqual(vctxt->inode->localName, localname)) ||
        (!xmlStrEqual(vctxt->inode->nsName, URI))) {
        VERROR_INT("xmlSchemaSAXHandleEndElementNs",
            "elem pop mismatch");
    }
    res = xmlSchemaValidatorPopElem(vctxt);
    if (res != 0) {
        if (res < 0) {
            VERROR_INT("xmlSchemaSAXHandleEndElementNs",
                "calling xmlSchemaValidatorPopElem()");
            goto internal_error;
        }
        goto exit;
    }
exit:
    return;
internal_error:
    vctxt->err = -1;
    xmlStopParser(vctxt->parserCtxt);
    return;
}

/************************************************************************
 *                                                                      *
 *                      Validation interfaces                           *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSchemaNewValidCtxt:
 * @schema:  a precompiled XML Schemas
 *
 * Create an XML Schemas validation context based on the given schema.
 *
 * Returns the validation context or NULL in case of error
 */
xmlSchemaValidCtxtPtr
xmlSchemaNewValidCtxt(xmlSchemaPtr schema)
{
    xmlSchemaValidCtxtPtr ret;

    ret = (xmlSchemaValidCtxtPtr) xmlMalloc(sizeof(xmlSchemaValidCtxt));
    if (ret == NULL) {
        xmlSchemaVErrMemory(NULL, "allocating validation context", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaValidCtxt));
    ret->type = XML_SCHEMA_CTXT_VALIDATOR;
    ret->dict = xmlDictCreate();
    ret->nodeQNames = xmlSchemaItemListCreate();
    ret->schema = schema;
    return (ret);
}

/**
 * xmlSchemaClearValidCtxt:
 * @ctxt: the schema validation context
 *
 * Free the resources associated to the schema validation context;
 * leaves some fields alive intended for reuse of the context.
 */
static void
xmlSchemaClearValidCtxt(xmlSchemaValidCtxtPtr vctxt)
{
    if (vctxt == NULL)
        return;

    /*
    * TODO: Should we clear the flags?
    *   Might be problematic if one reuses the context
    *   and assumes that the options remain the same.
    */
    vctxt->flags = 0;
    vctxt->validationRoot = NULL;
    vctxt->doc = NULL;
#ifdef LIBXML_READER_ENABLED
    vctxt->reader = NULL;
#endif
    vctxt->hasKeyrefs = 0;    

    if (vctxt->value != NULL) {
        xmlSchemaFreeValue(vctxt->value);
        vctxt->value = NULL;
    }
    /*
    * Augmented IDC information.
    */
    if (vctxt->aidcs != NULL) {
        xmlSchemaIDCAugPtr cur = vctxt->aidcs, next;
        do {
            next = cur->next;
            xmlFree(cur);
            cur = next;
        } while (cur != NULL);
        vctxt->aidcs = NULL;
    }
    if (vctxt->idcMatcherCache != NULL) {
        xmlSchemaIDCMatcherPtr matcher = vctxt->idcMatcherCache, tmp;

        while (matcher) {
            tmp = matcher;
            matcher = matcher->nextCached;
            xmlSchemaIDCFreeMatcherList(tmp);
        }
        vctxt->idcMatcherCache = NULL;
    }


    if (vctxt->idcNodes != NULL) {
        int i;
        xmlSchemaPSVIIDCNodePtr item;

        for (i = 0; i < vctxt->nbIdcNodes; i++) {
            item = vctxt->idcNodes[i];
            xmlFree(item->keys);
            xmlFree(item);
        }
        xmlFree(vctxt->idcNodes);
        vctxt->idcNodes = NULL;
        vctxt->nbIdcNodes = 0;
        vctxt->sizeIdcNodes = 0;
    }
    /*
    * Note that we won't delete the XPath state pool here.
    */
    if (vctxt->xpathStates != NULL) {
        xmlSchemaFreeIDCStateObjList(vctxt->xpathStates);
        vctxt->xpathStates = NULL;
    }
    /*
    * Attribute info.
    */
    if (vctxt->nbAttrInfos != 0) {
        xmlSchemaClearAttrInfos(vctxt);
    }
    /*
    * Element info.
    */
    if (vctxt->elemInfos != NULL) {
        int i;
        xmlSchemaNodeInfoPtr ei;

        for (i = 0; i < vctxt->sizeElemInfos; i++) {
            ei = vctxt->elemInfos[i];
            if (ei == NULL)
                break;
            xmlSchemaClearElemInfo(vctxt, ei);
        }
    }    
    xmlSchemaItemListClear(vctxt->nodeQNames);
    /* Recreate the dict. */
    xmlDictFree(vctxt->dict);
    /*
    * TODO: Is is save to recreate it? Do we have a scenario
    * where the user provides the dict?
    */
    vctxt->dict = xmlDictCreate();
}

/**
 * xmlSchemaFreeValidCtxt:
 * @ctxt:  the schema validation context
 *
 * Free the resources associated to the schema validation context
 */
void
xmlSchemaFreeValidCtxt(xmlSchemaValidCtxtPtr ctxt)
{
    if (ctxt == NULL)
        return;
    if (ctxt->value != NULL)
        xmlSchemaFreeValue(ctxt->value);
    if (ctxt->pctxt != NULL)
        xmlSchemaFreeParserCtxt(ctxt->pctxt);
    if (ctxt->idcNodes != NULL) {
        int i;
        xmlSchemaPSVIIDCNodePtr item;

        for (i = 0; i < ctxt->nbIdcNodes; i++) {
            item = ctxt->idcNodes[i];
            xmlFree(item->keys);
            xmlFree(item);
        }
        xmlFree(ctxt->idcNodes);
    }
    if (ctxt->idcKeys != NULL) {
        int i;
        for (i = 0; i < ctxt->nbIdcKeys; i++)
            xmlSchemaIDCFreeKey(ctxt->idcKeys[i]);
        xmlFree(ctxt->idcKeys);
    }

    if (ctxt->xpathStates != NULL) {
        xmlSchemaFreeIDCStateObjList(ctxt->xpathStates);
        ctxt->xpathStates = NULL;
    }
    if (ctxt->xpathStatePool != NULL) {
        xmlSchemaFreeIDCStateObjList(ctxt->xpathStatePool);
        ctxt->xpathStatePool = NULL;
    }

    /*
    * Augmented IDC information.
    */
    if (ctxt->aidcs != NULL) {
        xmlSchemaIDCAugPtr cur = ctxt->aidcs, next;
        do {
            next = cur->next;
            xmlFree(cur);
            cur = next;
        } while (cur != NULL);
    }
    if (ctxt->attrInfos != NULL) {
        int i;
        xmlSchemaAttrInfoPtr attr;

        /* Just a paranoid call to the cleanup. */
        if (ctxt->nbAttrInfos != 0)
            xmlSchemaClearAttrInfos(ctxt);
        for (i = 0; i < ctxt->sizeAttrInfos; i++) {
            attr = ctxt->attrInfos[i];
            xmlFree(attr);
        }
        xmlFree(ctxt->attrInfos);
    }
    if (ctxt->elemInfos != NULL) {
        int i;
        xmlSchemaNodeInfoPtr ei;

        for (i = 0; i < ctxt->sizeElemInfos; i++) {
            ei = ctxt->elemInfos[i];
            if (ei == NULL)
                break;
            xmlSchemaClearElemInfo(ctxt, ei);
            xmlFree(ei);
        }
        xmlFree(ctxt->elemInfos);
    }
    if (ctxt->nodeQNames != NULL)
        xmlSchemaItemListFree(ctxt->nodeQNames);
    if (ctxt->dict != NULL)
        xmlDictFree(ctxt->dict);
    xmlFree(ctxt);
}

/**
 * xmlSchemaIsValid:
 * @ctxt: the schema validation context
 *
 * Check if any error was detected during validation.
 * 
 * Returns 1 if valid so far, 0 if errors were detected, and -1 in case
 *         of internal error.
 */
int
xmlSchemaIsValid(xmlSchemaValidCtxtPtr ctxt)
{
    if (ctxt == NULL)
        return(-1);
    return(ctxt->err == 0);
}

/**
 * xmlSchemaSetValidErrors:
 * @ctxt:  a schema validation context
 * @err:  the error function
 * @warn: the warning function
 * @ctx: the functions context
 *
 * Set the error and warning callback informations
 */
void
xmlSchemaSetValidErrors(xmlSchemaValidCtxtPtr ctxt,
                        xmlSchemaValidityErrorFunc err,
                        xmlSchemaValidityWarningFunc warn, void *ctx)
{
    if (ctxt == NULL)
        return;
    ctxt->error = err;
    ctxt->warning = warn;
    ctxt->errCtxt = ctx;
    if (ctxt->pctxt != NULL)
        xmlSchemaSetParserErrors(ctxt->pctxt, err, warn, ctx);
}

/**
 * xmlSchemaSetValidStructuredErrors:
 * @ctxt:  a schema validation context
 * @serror:  the structured error function
 * @ctx: the functions context
 *
 * Set the structured error callback
 */
void
xmlSchemaSetValidStructuredErrors(xmlSchemaValidCtxtPtr ctxt,
                                  xmlStructuredErrorFunc serror, void *ctx)
{
    if (ctxt == NULL)
        return;
        ctxt->serror = serror;
    ctxt->error = NULL;
    ctxt->warning = NULL;
    ctxt->errCtxt = ctx;
    if (ctxt->pctxt != NULL)
        xmlSchemaSetParserStructuredErrors(ctxt->pctxt, serror, ctx);
}

/**
 * xmlSchemaGetValidErrors:
 * @ctxt:       a XML-Schema validation context
 * @err: the error function result
 * @warn: the warning function result
 * @ctx: the functions context result
 *
 * Get the error and warning callback informations
 *
 * Returns -1 in case of error and 0 otherwise
 */
int
xmlSchemaGetValidErrors(xmlSchemaValidCtxtPtr ctxt,
                        xmlSchemaValidityErrorFunc * err,
                        xmlSchemaValidityWarningFunc * warn, void **ctx)
{
        if (ctxt == NULL)
                return (-1);
        if (err != NULL)
                *err = ctxt->error;
        if (warn != NULL)
                *warn = ctxt->warning;
        if (ctx != NULL)
                *ctx = ctxt->errCtxt;
        return (0);
}


/**
 * xmlSchemaSetValidOptions:
 * @ctxt:       a schema validation context
 * @options: a combination of xmlSchemaValidOption
 *
 * Sets the options to be used during the validation.
 *
 * Returns 0 in case of success, -1 in case of an
 * API error.
 */
int
xmlSchemaSetValidOptions(xmlSchemaValidCtxtPtr ctxt,
                         int options)

{
    int i;

    if (ctxt == NULL)
        return (-1);
    /*
    * WARNING: Change the start value if adding to the
    * xmlSchemaValidOption.
    * TODO: Is there an other, more easy to maintain,
    * way?
    */
    for (i = 1; i < (int) sizeof(int) * 8; i++) {
        if (options & 1<<i)
            return (-1);
    }
    ctxt->options = options;
    return (0);
}

/**
 * xmlSchemaValidCtxtGetOptions:
 * @ctxt:       a schema validation context
 *
 * Get the validation context options.
 *
 * Returns the option combination or -1 on error.
 */
int
xmlSchemaValidCtxtGetOptions(xmlSchemaValidCtxtPtr ctxt)

{
    if (ctxt == NULL)
        return (-1);
    else
        return (ctxt->options);
}

static int
xmlSchemaVDocWalk(xmlSchemaValidCtxtPtr vctxt)
{
    xmlAttrPtr attr;
    int ret = 0;
    xmlSchemaNodeInfoPtr ielem = NULL;
    xmlNodePtr node, valRoot;
    const xmlChar *nsName;

    /* DOC VAL TODO: Move this to the start function. */
    valRoot = xmlDocGetRootElement(vctxt->doc);
    if (valRoot == NULL) {
        /* VAL TODO: Error code? */
        VERROR(1, NULL, "The document has no document element");
        return (1);
    }
    vctxt->depth = -1;
    vctxt->validationRoot = valRoot;
    node = valRoot;
    while (node != NULL) {
        if ((vctxt->skipDepth != -1) && (vctxt->depth >= vctxt->skipDepth))
            goto next_sibling;
        if (node->type == XML_ELEMENT_NODE) {

            /*
            * Init the node-info.
            */
            vctxt->depth++;
            if (xmlSchemaValidatorPushElem(vctxt) == -1)
                goto internal_error;
            ielem = vctxt->inode;
            ielem->node = node;
            ielem->nodeLine = node->line;
            ielem->localName = node->name;
            if (node->ns != NULL)
                ielem->nsName = node->ns->href;
            ielem->flags |= XML_SCHEMA_ELEM_INFO_EMPTY;
            /*
            * Register attributes.
            * DOC VAL TODO: We do not register namespace declaration
            * attributes yet.
            */
            vctxt->nbAttrInfos = 0;
            if (node->properties != NULL) {
                attr = node->properties;
                do {
                    if (attr->ns != NULL)
                        nsName = attr->ns->href;
                    else
                        nsName = NULL;
                    ret = xmlSchemaValidatorPushAttribute(vctxt,
                        (xmlNodePtr) attr,
                        /* 
                        * Note that we give it the line number of the
                        * parent element.
                        */
                        ielem->nodeLine,
                        attr->name, nsName, 0,
                        xmlNodeListGetString(attr->doc, attr->children, 1), 1);
                    if (ret == -1) {
                        VERROR_INT("xmlSchemaDocWalk",
                            "calling xmlSchemaValidatorPushAttribute()");
                        goto internal_error;
                    }
                    attr = attr->next;
                } while (attr);
            }
            /*
            * Validate the element.
            */
            ret = xmlSchemaValidateElem(vctxt);
            if (ret != 0) {
                if (ret == -1) {
                    VERROR_INT("xmlSchemaDocWalk",
                        "calling xmlSchemaValidateElem()");
                    goto internal_error;
                }
                /*
                * Don't stop validation; just skip the content
                * of this element.
                */
                goto leave_node;
            }
            if ((vctxt->skipDepth != -1) &&
                (vctxt->depth >= vctxt->skipDepth))
                goto leave_node;
        } else if ((node->type == XML_TEXT_NODE) ||
            (node->type == XML_CDATA_SECTION_NODE)) {
            /*
            * Process character content.
            */
            if ((ielem != NULL) && (ielem->flags & XML_SCHEMA_ELEM_INFO_EMPTY))
                ielem->flags ^= XML_SCHEMA_ELEM_INFO_EMPTY;
            ret = xmlSchemaVPushText(vctxt, node->type, node->content,
                -1, XML_SCHEMA_PUSH_TEXT_PERSIST, NULL);
            if (ret < 0) {
                VERROR_INT("xmlSchemaVDocWalk",
                    "calling xmlSchemaVPushText()");
                goto internal_error;
            }
            /*
            * DOC VAL TODO: Should we skip further validation of the
            * element content here?
            */
        } else if ((node->type == XML_ENTITY_NODE) ||
            (node->type == XML_ENTITY_REF_NODE)) {
            /*
            * DOC VAL TODO: What to do with entities?
            */      
            VERROR_INT("xmlSchemaVDocWalk",
                "there is at least one entity reference in the node-tree "
                "currently being validated. Processing of entities with "
                "this XML Schema processor is not supported (yet). Please "
                "substitute entities before validation.");
            goto internal_error;
        } else {
            goto leave_node;
            /*
            * DOC VAL TODO: XInclude nodes, etc.
            */
        }
        /*
        * Walk the doc.
        */
        if (node->children != NULL) {
            node = node->children;
            continue;
        }
leave_node:
        if (node->type == XML_ELEMENT_NODE) {
            /*
            * Leaving the scope of an element.
            */
            if (node != vctxt->inode->node) {
                VERROR_INT("xmlSchemaVDocWalk",
                    "element position mismatch");
                goto internal_error;
            }
            ret = xmlSchemaValidatorPopElem(vctxt);
            if (ret != 0) {
                if (ret < 0) {
                    VERROR_INT("xmlSchemaVDocWalk",
                        "calling xmlSchemaValidatorPopElem()");
                    goto internal_error;
                }
            }
            if (node == valRoot)
                goto exit;
        }
next_sibling:
        if (node->next != NULL)
            node = node->next;
        else {
            node = node->parent;
            goto leave_node;
        }
    }

exit:
    return (ret);
internal_error:
    return (-1);
}

static int
xmlSchemaPreRun(xmlSchemaValidCtxtPtr vctxt) {
    /*
    * Some initialization.
    */    
    vctxt->err = 0;
    vctxt->nberrors = 0;
    vctxt->depth = -1;
    vctxt->skipDepth = -1;
    vctxt->xsiAssemble = 0;
    vctxt->hasKeyrefs = 0;
#ifdef ENABLE_IDC_NODE_TABLES_TEST
    vctxt->createIDCNodeTables = 1;
#else
    vctxt->createIDCNodeTables = 0;
#endif
    /*
    * Create a schema + parser if necessary.
    */
    if (vctxt->schema == NULL) {
        xmlSchemaParserCtxtPtr pctxt;
        
        vctxt->xsiAssemble = 1;
        /* 
        * If not schema was given then we will create a schema
        * dynamically using XSI schema locations.
        *
        * Create the schema parser context.
        */
        if ((vctxt->pctxt == NULL) &&
           (xmlSchemaCreatePCtxtOnVCtxt(vctxt) == -1))
           return (-1);
        pctxt = vctxt->pctxt;
        pctxt->xsiAssemble = 1;
        /*
        * Create the schema.
        */
        vctxt->schema = xmlSchemaNewSchema(pctxt);
        if (vctxt->schema == NULL)
            return (-1);                
        /* 
        * Create the schema construction context.
        */
        pctxt->constructor = xmlSchemaConstructionCtxtCreate(pctxt->dict);
        if (pctxt->constructor == NULL)
            return(-1);
        pctxt->constructor->mainSchema = vctxt->schema;
        /*
        * Take ownership of the constructor to be able to free it.
        */
        pctxt->ownsConstructor = 1;
    }   
    /*
    * Augment the IDC definitions.
    */
    if (vctxt->schema->idcDef != NULL) {
        xmlHashScan(vctxt->schema->idcDef,
            (xmlHashScanner) xmlSchemaAugmentIDC, vctxt);
    }
    return(0);
}

static void
xmlSchemaPostRun(xmlSchemaValidCtxtPtr vctxt) {
    if (vctxt->xsiAssemble) {
        if (vctxt->schema != NULL) {
            xmlSchemaFree(vctxt->schema);
            vctxt->schema = NULL;
        }
    }
    xmlSchemaClearValidCtxt(vctxt);
}

static int
xmlSchemaVStart(xmlSchemaValidCtxtPtr vctxt)
{
    int ret = 0;

    if (xmlSchemaPreRun(vctxt) < 0)
        return(-1);

    if (vctxt->doc != NULL) {
        /*
         * Tree validation.
         */
        ret = xmlSchemaVDocWalk(vctxt);
#ifdef LIBXML_READER_ENABLED
    } else if (vctxt->reader != NULL) {
        /*
         * XML Reader validation.
         */
#ifdef XML_SCHEMA_READER_ENABLED
        ret = xmlSchemaVReaderWalk(vctxt);
#endif
#endif
    } else if ((vctxt->sax != NULL) && (vctxt->parserCtxt != NULL)) {
        /*
         * SAX validation.
         */
        ret = xmlParseDocument(vctxt->parserCtxt);
    } else {
        VERROR_INT("xmlSchemaVStart",
            "no instance to validate");
        ret = -1;
    }

    xmlSchemaPostRun(vctxt);
    if (ret == 0)
        ret = vctxt->err;
    return (ret);
}

/**
 * xmlSchemaValidateOneElement:
 * @ctxt:  a schema validation context
 * @elem:  an element node
 *
 * Validate a branch of a tree, starting with the given @elem.
 *
 * Returns 0 if the element and its subtree is valid, a positive error
 * code number otherwise and -1 in case of an internal or API error.
 */
int
xmlSchemaValidateOneElement(xmlSchemaValidCtxtPtr ctxt, xmlNodePtr elem)
{
    if ((ctxt == NULL) || (elem == NULL) || (elem->type != XML_ELEMENT_NODE))
        return (-1);

    if (ctxt->schema == NULL)
        return (-1);

    ctxt->doc = elem->doc;
    ctxt->node = elem;
    ctxt->validationRoot = elem;
    return(xmlSchemaVStart(ctxt));
}

/**
 * xmlSchemaValidateDoc:
 * @ctxt:  a schema validation context
 * @doc:  a parsed document tree
 *
 * Validate a document tree in memory.
 *
 * Returns 0 if the document is schemas valid, a positive error code
 *     number otherwise and -1 in case of internal or API error.
 */
int
xmlSchemaValidateDoc(xmlSchemaValidCtxtPtr ctxt, xmlDocPtr doc)
{
    if ((ctxt == NULL) || (doc == NULL))
        return (-1);

    ctxt->doc = doc;
    ctxt->node = xmlDocGetRootElement(doc);
    if (ctxt->node == NULL) {
        xmlSchemaCustomErr(ACTXT_CAST ctxt,
            XML_SCHEMAV_DOCUMENT_ELEMENT_MISSING,
            (xmlNodePtr) doc, NULL,
            "The document has no document element", NULL, NULL);
        return (ctxt->err);
    }
    ctxt->validationRoot = ctxt->node;
    return (xmlSchemaVStart(ctxt));
}


/************************************************************************
 *                                                                      *
 *              Function and data for SAX streaming API                 *
 *                                                                      *
 ************************************************************************/
typedef struct _xmlSchemaSplitSAXData xmlSchemaSplitSAXData;
typedef xmlSchemaSplitSAXData *xmlSchemaSplitSAXDataPtr;

struct _xmlSchemaSplitSAXData {
    xmlSAXHandlerPtr      user_sax;
    void                 *user_data;
    xmlSchemaValidCtxtPtr ctxt;
    xmlSAXHandlerPtr      schemas_sax;
};

#define XML_SAX_PLUG_MAGIC 0xdc43ba21

struct _xmlSchemaSAXPlug {
    unsigned int magic;

    /* the original callbacks informations */
    xmlSAXHandlerPtr     *user_sax_ptr;
    xmlSAXHandlerPtr      user_sax;
    void                **user_data_ptr;
    void                 *user_data;

    /* the block plugged back and validation informations */
    xmlSAXHandler         schemas_sax;
    xmlSchemaValidCtxtPtr ctxt;
};

/* All those functions just bounces to the user provided SAX handlers */
static void
internalSubsetSplit(void *ctx, const xmlChar *name,
               const xmlChar *ExternalID, const xmlChar *SystemID)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->internalSubset != NULL))
        ctxt->user_sax->internalSubset(ctxt->user_data, name, ExternalID,
                                       SystemID);
}

static int
isStandaloneSplit(void *ctx)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->isStandalone != NULL))
        return(ctxt->user_sax->isStandalone(ctxt->user_data));
    return(0);
}

static int
hasInternalSubsetSplit(void *ctx)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->hasInternalSubset != NULL))
        return(ctxt->user_sax->hasInternalSubset(ctxt->user_data));
    return(0);
}

static int
hasExternalSubsetSplit(void *ctx)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->hasExternalSubset != NULL))
        return(ctxt->user_sax->hasExternalSubset(ctxt->user_data));
    return(0);
}

static void
externalSubsetSplit(void *ctx, const xmlChar *name,
               const xmlChar *ExternalID, const xmlChar *SystemID)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->internalSubset != NULL))
        ctxt->user_sax->internalSubset(ctxt->user_data, name, ExternalID,
                                       SystemID);
}

static xmlParserInputPtr
resolveEntitySplit(void *ctx, const xmlChar *publicId, const xmlChar *systemId)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->resolveEntity != NULL))
        return(ctxt->user_sax->resolveEntity(ctxt->user_data, publicId,
                                             systemId));
    return(NULL);
}

static xmlEntityPtr
getEntitySplit(void *ctx, const xmlChar *name)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->getEntity != NULL))
        return(ctxt->user_sax->getEntity(ctxt->user_data, name));
    return(NULL);
}

static xmlEntityPtr
getParameterEntitySplit(void *ctx, const xmlChar *name)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->getParameterEntity != NULL))
        return(ctxt->user_sax->getParameterEntity(ctxt->user_data, name));
    return(NULL);
}


static void
entityDeclSplit(void *ctx, const xmlChar *name, int type,
          const xmlChar *publicId, const xmlChar *systemId, xmlChar *content)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->entityDecl != NULL))
        ctxt->user_sax->entityDecl(ctxt->user_data, name, type, publicId,
                                   systemId, content);
}

static void
attributeDeclSplit(void *ctx, const xmlChar * elem,
                   const xmlChar * name, int type, int def,
                   const xmlChar * defaultValue, xmlEnumerationPtr tree)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->attributeDecl != NULL)) {
        ctxt->user_sax->attributeDecl(ctxt->user_data, elem, name, type,
                                      def, defaultValue, tree);
    } else {
        xmlFreeEnumeration(tree);
    }
}

static void
elementDeclSplit(void *ctx, const xmlChar *name, int type,
            xmlElementContentPtr content)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->elementDecl != NULL))
        ctxt->user_sax->elementDecl(ctxt->user_data, name, type, content);
}

static void
notationDeclSplit(void *ctx, const xmlChar *name,
             const xmlChar *publicId, const xmlChar *systemId)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->notationDecl != NULL))
        ctxt->user_sax->notationDecl(ctxt->user_data, name, publicId,
                                     systemId);
}

static void
unparsedEntityDeclSplit(void *ctx, const xmlChar *name,
                   const xmlChar *publicId, const xmlChar *systemId,
                   const xmlChar *notationName)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->unparsedEntityDecl != NULL))
        ctxt->user_sax->unparsedEntityDecl(ctxt->user_data, name, publicId,
                                           systemId, notationName);
}

static void
setDocumentLocatorSplit(void *ctx, xmlSAXLocatorPtr loc)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->setDocumentLocator != NULL))
        ctxt->user_sax->setDocumentLocator(ctxt->user_data, loc);
}

static void
startDocumentSplit(void *ctx)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->startDocument != NULL))
        ctxt->user_sax->startDocument(ctxt->user_data);
}

static void
endDocumentSplit(void *ctx)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->endDocument != NULL))
        ctxt->user_sax->endDocument(ctxt->user_data);
}

static void
processingInstructionSplit(void *ctx, const xmlChar *target,
                      const xmlChar *data)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->processingInstruction != NULL))
        ctxt->user_sax->processingInstruction(ctxt->user_data, target, data);
}

static void
commentSplit(void *ctx, const xmlChar *value)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->comment != NULL))
        ctxt->user_sax->comment(ctxt->user_data, value);
}

/*
 * Varargs error callbacks to the user application, harder ...
 */

static void XMLCDECL
warningSplit(void *ctx, const char *msg ATTRIBUTE_UNUSED, ...) {
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->warning != NULL)) {
        TODO
    }
}
static void XMLCDECL
errorSplit(void *ctx, const char *msg ATTRIBUTE_UNUSED, ...) {
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->error != NULL)) {
        TODO
    }
}
static void XMLCDECL
fatalErrorSplit(void *ctx, const char *msg ATTRIBUTE_UNUSED, ...) {
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->fatalError != NULL)) {
        TODO
    }
}

/*
 * Those are function where both the user handler and the schemas handler
 * need to be called.
 */
static void
charactersSplit(void *ctx, const xmlChar *ch, int len)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if (ctxt == NULL)
        return;
    if ((ctxt->user_sax != NULL) && (ctxt->user_sax->characters != NULL))
        ctxt->user_sax->characters(ctxt->user_data, ch, len);
    if (ctxt->ctxt != NULL)
        xmlSchemaSAXHandleText(ctxt->ctxt, ch, len);
}

static void
ignorableWhitespaceSplit(void *ctx, const xmlChar *ch, int len)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if (ctxt == NULL)
        return;
    if ((ctxt->user_sax != NULL) &&
        (ctxt->user_sax->ignorableWhitespace != NULL))
        ctxt->user_sax->ignorableWhitespace(ctxt->user_data, ch, len);
    if (ctxt->ctxt != NULL)
        xmlSchemaSAXHandleText(ctxt->ctxt, ch, len);
}

static void
cdataBlockSplit(void *ctx, const xmlChar *value, int len)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if (ctxt == NULL)
        return;
    if ((ctxt->user_sax != NULL) &&
        (ctxt->user_sax->ignorableWhitespace != NULL))
        ctxt->user_sax->ignorableWhitespace(ctxt->user_data, value, len);
    if (ctxt->ctxt != NULL)
        xmlSchemaSAXHandleCDataSection(ctxt->ctxt, value, len);
}

static void
referenceSplit(void *ctx, const xmlChar *name)
{
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if (ctxt == NULL)
        return;
    if ((ctxt != NULL) && (ctxt->user_sax != NULL) &&
        (ctxt->user_sax->reference != NULL))
        ctxt->user_sax->reference(ctxt->user_data, name);
    if (ctxt->ctxt != NULL)
        xmlSchemaSAXHandleReference(ctxt->user_data, name);
}

static void
startElementNsSplit(void *ctx, const xmlChar * localname, 
                    const xmlChar * prefix, const xmlChar * URI, 
                    int nb_namespaces, const xmlChar ** namespaces, 
                    int nb_attributes, int nb_defaulted, 
                    const xmlChar ** attributes) {
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if (ctxt == NULL)
        return;
    if ((ctxt->user_sax != NULL) &&
        (ctxt->user_sax->startElementNs != NULL))
        ctxt->user_sax->startElementNs(ctxt->user_data, localname, prefix,
                                       URI, nb_namespaces, namespaces,
                                       nb_attributes, nb_defaulted,
                                       attributes);
    if (ctxt->ctxt != NULL)
        xmlSchemaSAXHandleStartElementNs(ctxt->ctxt, localname, prefix,
                                         URI, nb_namespaces, namespaces,
                                         nb_attributes, nb_defaulted,
                                         attributes);
}

static void
endElementNsSplit(void *ctx, const xmlChar * localname, 
                    const xmlChar * prefix, const xmlChar * URI) {
    xmlSchemaSAXPlugPtr ctxt = (xmlSchemaSAXPlugPtr) ctx;
    if (ctxt == NULL)
        return;
    if ((ctxt->user_sax != NULL) &&
        (ctxt->user_sax->endElementNs != NULL))
        ctxt->user_sax->endElementNs(ctxt->user_data, localname, prefix, URI);
    if (ctxt->ctxt != NULL)
        xmlSchemaSAXHandleEndElementNs(ctxt->ctxt, localname, prefix, URI);
}

/**
 * xmlSchemaSAXPlug:
 * @ctxt:  a schema validation context
 * @sax:  a pointer to the original xmlSAXHandlerPtr
 * @user_data:  a pointer to the original SAX user data pointer
 *
 * Plug a SAX based validation layer in a SAX parsing event flow.
 * The original @saxptr and @dataptr data are replaced by new pointers
 * but the calls to the original will be maintained.
 *
 * Returns a pointer to a data structure needed to unplug the validation layer
 *         or NULL in case of errors.
 */
xmlSchemaSAXPlugPtr
xmlSchemaSAXPlug(xmlSchemaValidCtxtPtr ctxt,
                 xmlSAXHandlerPtr *sax, void **user_data)
{
    xmlSchemaSAXPlugPtr ret;
    xmlSAXHandlerPtr old_sax;

    if ((ctxt == NULL) || (sax == NULL) || (user_data == NULL))
        return(NULL);

    /*
     * We only allow to plug into SAX2 event streams
     */
    old_sax = *sax;
    if ((old_sax != NULL) && (old_sax->initialized != XML_SAX2_MAGIC))
        return(NULL);
    if ((old_sax != NULL) && 
        (old_sax->startElementNs == NULL) && (old_sax->endElementNs == NULL) &&
        ((old_sax->startElement != NULL) || (old_sax->endElement != NULL)))
        return(NULL);

    /*
     * everything seems right allocate the local data needed for that layer
     */
    ret = (xmlSchemaSAXPlugPtr) xmlMalloc(sizeof(xmlSchemaSAXPlugStruct));
    if (ret == NULL) {
        return(NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaSAXPlugStruct));
    ret->magic = XML_SAX_PLUG_MAGIC;
    ret->schemas_sax.initialized = XML_SAX2_MAGIC;
    ret->ctxt = ctxt;
    ret->user_sax_ptr = sax;
    ret->user_sax = old_sax;
    if (old_sax == NULL) {      
        /*
         * go direct, no need for the split block and functions.
         */
        ret->schemas_sax.startElementNs = xmlSchemaSAXHandleStartElementNs;
        ret->schemas_sax.endElementNs = xmlSchemaSAXHandleEndElementNs;
        /*
         * Note that we use the same text-function for both, to prevent
         * the parser from testing for ignorable whitespace.
         */
        ret->schemas_sax.ignorableWhitespace = xmlSchemaSAXHandleText;
        ret->schemas_sax.characters = xmlSchemaSAXHandleText;

        ret->schemas_sax.cdataBlock = xmlSchemaSAXHandleCDataSection;
        ret->schemas_sax.reference = xmlSchemaSAXHandleReference;

        ret->user_data = ctxt;
        *user_data = ctxt;
    } else {
       /*
        * for each callback unused by Schemas initialize it to the Split
        * routine only if non NULL in the user block, this can speed up 
        * things at the SAX level.
        */
        if (old_sax->internalSubset != NULL)
            ret->schemas_sax.internalSubset = internalSubsetSplit;
        if (old_sax->isStandalone != NULL)
            ret->schemas_sax.isStandalone = isStandaloneSplit;
        if (old_sax->hasInternalSubset != NULL)
            ret->schemas_sax.hasInternalSubset = hasInternalSubsetSplit;
        if (old_sax->hasExternalSubset != NULL)
            ret->schemas_sax.hasExternalSubset = hasExternalSubsetSplit;
        if (old_sax->resolveEntity != NULL)
            ret->schemas_sax.resolveEntity = resolveEntitySplit;
        if (old_sax->getEntity != NULL)
            ret->schemas_sax.getEntity = getEntitySplit;
        if (old_sax->entityDecl != NULL)
            ret->schemas_sax.entityDecl = entityDeclSplit;
        if (old_sax->notationDecl != NULL)
            ret->schemas_sax.notationDecl = notationDeclSplit;
        if (old_sax->attributeDecl != NULL)
            ret->schemas_sax.attributeDecl = attributeDeclSplit;
        if (old_sax->elementDecl != NULL)
            ret->schemas_sax.elementDecl = elementDeclSplit;
        if (old_sax->unparsedEntityDecl != NULL)
            ret->schemas_sax.unparsedEntityDecl = unparsedEntityDeclSplit;
        if (old_sax->setDocumentLocator != NULL)
            ret->schemas_sax.setDocumentLocator = setDocumentLocatorSplit;
        if (old_sax->startDocument != NULL)
            ret->schemas_sax.startDocument = startDocumentSplit;
        if (old_sax->endDocument != NULL)
            ret->schemas_sax.endDocument = endDocumentSplit;
        if (old_sax->processingInstruction != NULL)
            ret->schemas_sax.processingInstruction = processingInstructionSplit;
        if (old_sax->comment != NULL)
            ret->schemas_sax.comment = commentSplit;
        if (old_sax->warning != NULL)
            ret->schemas_sax.warning = warningSplit;
        if (old_sax->error != NULL)
            ret->schemas_sax.error = errorSplit;
        if (old_sax->fatalError != NULL)
            ret->schemas_sax.fatalError = fatalErrorSplit;
        if (old_sax->getParameterEntity != NULL)
            ret->schemas_sax.getParameterEntity = getParameterEntitySplit;
        if (old_sax->externalSubset != NULL)
            ret->schemas_sax.externalSubset = externalSubsetSplit;

        /*
         * the 6 schemas callback have to go to the splitter functions
         * Note that we use the same text-function for ignorableWhitespace
         * if possible, to prevent the parser from testing for ignorable
         * whitespace.
         */
        ret->schemas_sax.characters = charactersSplit;
        if ((old_sax->ignorableWhitespace != NULL) &&
            (old_sax->ignorableWhitespace != old_sax->characters))
            ret->schemas_sax.ignorableWhitespace = ignorableWhitespaceSplit;
        else
            ret->schemas_sax.ignorableWhitespace = charactersSplit;
        ret->schemas_sax.cdataBlock = cdataBlockSplit;
        ret->schemas_sax.reference = referenceSplit;
        ret->schemas_sax.startElementNs = startElementNsSplit;
        ret->schemas_sax.endElementNs = endElementNsSplit;

        ret->user_data_ptr = user_data;
        ret->user_data = *user_data;
        *user_data = ret;
    }

    /*
     * plug the pointers back.
     */
    *sax = &(ret->schemas_sax);
    ctxt->sax = *sax;
    ctxt->flags |= XML_SCHEMA_VALID_CTXT_FLAG_STREAM;
    xmlSchemaPreRun(ctxt);
    return(ret);
}

/**
 * xmlSchemaSAXUnplug:
 * @plug:  a data structure returned by xmlSchemaSAXPlug
 *
 * Unplug a SAX based validation layer in a SAX parsing event flow.
 * The original pointers used in the call are restored.
 *
 * Returns 0 in case of success and -1 in case of failure.
 */
int
xmlSchemaSAXUnplug(xmlSchemaSAXPlugPtr plug)
{
    xmlSAXHandlerPtr *sax;
    void **user_data;

    if ((plug == NULL) || (plug->magic != XML_SAX_PLUG_MAGIC))
        return(-1);
    plug->magic = 0;

    xmlSchemaPostRun(plug->ctxt);
    /* restore the data */
    sax = plug->user_sax_ptr;
    *sax = plug->user_sax;
    if (plug->user_sax != NULL) {
        user_data = plug->user_data_ptr;
        *user_data = plug->user_data;
    }

    /* free and return */
    xmlFree(plug);
    return(0);
}

/**
 * xmlSchemaValidateStream:
 * @ctxt:  a schema validation context
 * @input:  the input to use for reading the data
 * @enc:  an optional encoding information
 * @sax:  a SAX handler for the resulting events
 * @user_data:  the context to provide to the SAX handler.
 *
 * Validate an input based on a flow of SAX event from the parser
 * and forward the events to the @sax handler with the provided @user_data
 * the user provided @sax handler must be a SAX2 one.
 *
 * Returns 0 if the document is schemas valid, a positive error code
 *     number otherwise and -1 in case of internal or API error.
 */
int
xmlSchemaValidateStream(xmlSchemaValidCtxtPtr ctxt,
                        xmlParserInputBufferPtr input, xmlCharEncoding enc,
                        xmlSAXHandlerPtr sax, void *user_data)
{
    xmlSchemaSAXPlugPtr plug = NULL;
    xmlSAXHandlerPtr old_sax = NULL;
    xmlParserCtxtPtr pctxt = NULL;
    xmlParserInputPtr inputStream = NULL;
    int ret;

    if ((ctxt == NULL) || (input == NULL))
        return (-1);

    /*
     * prepare the parser
     */
    pctxt = xmlNewParserCtxt();
    if (pctxt == NULL)
        return (-1);
    old_sax = pctxt->sax;
    pctxt->sax = sax;
    pctxt->userData = user_data;
#if 0
    if (options)
        xmlCtxtUseOptions(pctxt, options);
#endif
    pctxt->linenumbers = 1;    

    inputStream = xmlNewIOInputStream(pctxt, input, enc);;
    if (inputStream == NULL) {
        ret = -1;
        goto done;
    }
    inputPush(pctxt, inputStream);
    ctxt->parserCtxt = pctxt;
    ctxt->input = input;

    /*
     * Plug the validation and launch the parsing
     */
    plug = xmlSchemaSAXPlug(ctxt, &(pctxt->sax), &(pctxt->userData));
    if (plug == NULL) {
        ret = -1;
        goto done;
    }
    ctxt->input = input;
    ctxt->enc = enc;
    ctxt->sax = pctxt->sax;
    ctxt->flags |= XML_SCHEMA_VALID_CTXT_FLAG_STREAM;
    ret = xmlSchemaVStart(ctxt);

    if ((ret == 0) && (! ctxt->parserCtxt->wellFormed)) {
        ret = ctxt->parserCtxt->errNo;
        if (ret == 0)
            ret = 1;
    }    

done:
    ctxt->parserCtxt = NULL;
    ctxt->sax = NULL;
    ctxt->input = NULL;
    if (plug != NULL) {
        xmlSchemaSAXUnplug(plug);
    }
    /* cleanup */
    if (pctxt != NULL) {
        pctxt->sax = old_sax;
        xmlFreeParserCtxt(pctxt);
    }
    return (ret);
}

/**
 * xmlSchemaValidateFile:
 * @ctxt: a schema validation context
 * @filename: the URI of the instance
 * @options: a future set of options, currently unused
 *
 * Do a schemas validation of the given resource, it will use the
 * SAX streamable validation internally.
 *
 * Returns 0 if the document is valid, a positive error code
 *     number otherwise and -1 in case of an internal or API error.
 */
int
xmlSchemaValidateFile(xmlSchemaValidCtxtPtr ctxt,
                      const char * filename,
                      int options ATTRIBUTE_UNUSED)
{
    int ret;
    xmlParserInputBufferPtr input;

    if ((ctxt == NULL) || (filename == NULL))
        return (-1);
    
    input = xmlParserInputBufferCreateFilename(filename,
        XML_CHAR_ENCODING_NONE);
    if (input == NULL)
        return (-1);
    ret = xmlSchemaValidateStream(ctxt, input, XML_CHAR_ENCODING_NONE,
        NULL, NULL);    
    return (ret);
}

#define bottom_xmlschemas
#include "elfgcchack.h"
#endif /* LIBXML_SCHEMAS_ENABLED */
