ENH: Add ability to read XML files from disk into Xdmf structures in memory.

CMakeLists.txt

@@ -47,6 +47,7 @@ set(XdmfSources
 	XdmfItem
 	XdmfItemProperty
 	XdmfObject
+	XdmfReader
 	XdmfTopology
 	XdmfTopologyType
 	XdmfVisitor

Xdmf.i

@@ -14,11 +14,12 @@ swig -v -c++ -python -o XdmfPython.cpp Xdmf.i
 	#include <XdmfGeometry.hpp>
 	#include <XdmfGeometryType.hpp>
 	#include <XdmfGrid.hpp>
-  #include <XdmfHDF5Controller.hpp>
+	#include <XdmfHDF5Controller.hpp>
 	#include <XdmfHDF5Writer.hpp>
 	#include <XdmfItem.hpp>
 	#include <XdmfItemProperty.hpp>
 	#include <XdmfObject.hpp>
+	#include <XdmfReader.hpp>
 	#include <XdmfTopology.hpp>
 	#include <XdmfTopologyType.hpp>
 	#include <XdmfVisitor.hpp>
@@ -58,6 +59,7 @@ namespace boost {
 %template(XdmfHDF5WriterPtr) boost::shared_ptr<XdmfHDF5Writer>;
 %template(XdmfItemPtr) boost::shared_ptr<XdmfItem>;
 %template(XdmfObjPtr) boost::shared_ptr<XdmfObject>;
+%template(XdmfReaderPtr) boost::shared_ptr<XdmfReader>;
 %template(XdmfTopologyPtr) boost::shared_ptr<XdmfTopology>;
 %template(XdmfVisitorPtr) boost::shared_ptr<XdmfVisitor>;
 %template(XdmfWriterPtr) boost::shared_ptr<XdmfWriter>;
@@ -91,6 +93,7 @@ SWIG_SHARED_PTR_DERIVED(XdmfHDF5Writer, XdmfVisitor);
 SWIG_SHARED_PTR_DERIVED(XdmfHDF5Writer, Loki::BaseVisitor);
 SWIG_SHARED_PTR_DERIVED(XdmfHDF5Writer, XdmfObject);
 SWIG_SHARED_PTR_DERIVED(XdmfItem, XdmfObject);
+SWIG_SHARED_PTR_DERIVED(XdmfReader, XdmfObject);
 SWIG_SHARED_PTR_DERIVED(XdmfTopology, XdmfDataItem);
 SWIG_SHARED_PTR_DERIVED(XdmfTopology, XdmfItem);
 SWIG_SHARED_PTR_DERIVED(XdmfTopology, XdmfObject);
@@ -103,15 +106,15 @@ SWIG_SHARED_PTR_DERIVED(XdmfWriter, XdmfObject);
 %include XdmfObject.hpp
 
 %include XdmfItem.hpp
+%include XdmfDataItem.hpp
 %include XdmfItemProperty.hpp
 %include XdmfVisitor.hpp
 
 %include XdmfHDF5Controller.hpp
 %include XdmfHDF5Writer.hpp
+%include XdmfReader.hpp
 %include XdmfWriter.hpp
 
-%include XdmfDataItem.hpp
-
 %include XdmfAttribute.hpp
 %include XdmfAttributeCenter.hpp
 %include XdmfAttributeType.hpp

XdmfArray.cpp

@@ -5,10 +5,12 @@
  *      Author: kleiter
  */
 
+#include <boost/foreach.hpp>
+#include <boost/tokenizer.hpp>
+#include <sstream>
 #include "XdmfArray.hpp"
 #include "XdmfHDF5Controller.hpp"
 #include "XdmfVisitor.hpp"
-#include <sstream>
 
 class XdmfArray::Clear : public boost::static_visitor <void> {
 public:
@@ -363,6 +365,8 @@ XdmfArray::~XdmfArray()
 	std::cout << "Deleted Array " << this << std::endl;
 }
 
+std::string XdmfArray::ItemTag = "DataItem";
+
 void XdmfArray::copyValues(const unsigned int startIndex, const boost::shared_ptr<const XdmfArray> values, const unsigned int valuesStartIndex, const unsigned int numValues, const unsigned int arrayStride, const unsigned int valuesStride)
 {
 	if(mHaveArrayPointer)
@@ -410,7 +414,14 @@ boost::shared_ptr<const XdmfHDF5Controller> XdmfArray::getHDF5Controller() const
 std::map<std::string, std::string> XdmfArray::getItemProperties() const
 {
 	std::map<std::string, std::string> arrayProperties;
-	arrayProperties["Format"] = "HDF";
+	if(mHDF5Controller)
+	{
+		arrayProperties["Format"] = "HDF";
+	}
+	else
+	{
+		arrayProperties["Format"] = "XML";
+	}
 	arrayProperties["DataType"] = this->getType();
 	std::stringstream precision;
 	precision <<  this->getPrecision();
@@ -423,7 +434,7 @@ std::map<std::string, std::string> XdmfArray::getItemProperties() const
 
 std::string XdmfArray::getItemTag() const
 {
-	return "DataItem";
+	return ItemTag;
 }
 
 unsigned int XdmfArray::getPrecision() const
@@ -503,6 +514,50 @@ std::string XdmfArray::getValuesString() const
 	return "";
 }
 
+void XdmfArray::initialize(const std::string & type, const unsigned int precision)
+{
+	if(type.compare("Char") == 0 && precision == 1)
+	{
+		this->initialize<char>();
+	}
+	else if(type.compare("Short") == 0 && precision == 2)
+	{
+		this->initialize<short>();
+	}
+	else if(type.compare("Int") == 0 && precision == 4)
+	{
+		this->initialize<int>();
+	}
+	else if(type.compare("Long") == 0 && precision == 8)
+	{
+		this->initialize<long>();
+	}
+	else if(type.compare("Float") == 0 && precision == 4)
+	{
+		this->initialize<float>();
+	}
+	else if(type.compare("Double") == 0 && precision == 8)
+	{
+		this->initialize<double>();
+	}
+	else if(type.compare("UChar") == 0 && precision == 8)
+	{
+		this->initialize<unsigned char>();
+	}
+	else if(type.compare("UShort") == 0 && precision == 8)
+	{
+		this->initialize<unsigned short>();
+	}
+	else if(type.compare("UInt") == 0 && precision == 8)
+	{
+		this->initialize<unsigned int>();
+	}
+	else
+	{
+		assert(false);
+	}
+}
+
 void XdmfArray::internalizeArrayPointer()
 {
 	if(mHaveArrayPointer)
@@ -511,6 +566,79 @@ void XdmfArray::internalizeArrayPointer()
 	}
 }
 
+void XdmfArray::populateItem(const std::map<std::string, std::string> & itemProperties, std::vector<boost::shared_ptr<XdmfItem> > & childItems)
+{
+	std::string contentVal;
+	int precisionVal;
+	int sizeVal;
+	std::string typeVal;
+
+	std::map<std::string, std::string>::const_iterator content = itemProperties.find("Content");
+	if(content != itemProperties.end())
+	{
+		contentVal = content->second;
+	}
+	else
+	{
+		assert(false);
+	}
+	std::map<std::string, std::string>::const_iterator precision = itemProperties.find("Precision");
+	if(precision != itemProperties.end())
+	{
+		precisionVal = atoi(precision->second.c_str());
+	}
+	else
+	{
+		assert(false);
+	}
+	std::map<std::string, std::string>::const_iterator size = itemProperties.find("Dimensions");
+	if(size != itemProperties.end())
+	{
+		sizeVal = atoi(size->second.c_str());
+	}
+	else
+	{
+		assert(false);
+	}
+	std::map<std::string, std::string>::const_iterator type = itemProperties.find("DataType");
+	if(type != itemProperties.end())
+	{
+		typeVal = type->second;
+	}
+	else
+	{
+		assert(false);
+	}
+	std::map<std::string, std::string>::const_iterator format = itemProperties.find("Format");
+	if(format != itemProperties.end())
+	{
+		if(format->second.compare("HDF") == 0)
+		{
+			mHDF5Controller = XdmfHDF5Controller::New(contentVal, precisionVal, sizeVal, typeVal);
+		}
+		else if(format->second.compare("XML") == 0)
+		{
+			this->initialize(typeVal, precisionVal);
+			this->reserve(sizeVal);
+			boost::char_separator<char> sep(" ");
+			boost::tokenizer<boost::char_separator<char> > tokens(contentVal, sep);
+			BOOST_FOREACH(std::string t, tokens)
+			{
+				double val = atof(t.c_str());
+				this->pushBack(val);
+			}
+		}
+		else
+		{
+			assert(false);
+		}
+	}
+	else
+	{
+		assert(false);
+	}
+}
+
 void XdmfArray::read()
 {
 	if(mHDF5Controller)

XdmfArray.hpp

@@ -51,6 +51,7 @@ public:
 	XdmfNewMacro(XdmfArray);
 	LOKI_DEFINE_VISITABLE(XdmfArray, XdmfItem)
 	friend class XdmfHDF5Writer;
+	static std::string ItemTag;
 
 	/**
 	 * Copy values from an XdmfArray into this array.
@@ -178,13 +179,19 @@ public:
 	template <typename T>
 	boost::shared_ptr<std::vector<T> > initialize();
 
+	/**
+	 * Copy a value to the back of this array
+	 */
+	template <typename T>
+	void pushBack(T & value);
+
 	/**
 	 * Read data from disk into memory.
 	 */
 	void read();
 
 	/**
-	 * Release all data held by this XdmfArray.
+	 * Release all data from currently held in memory.
 	 */
 	void release();
 
@@ -200,10 +207,10 @@ public:
 	 * to val.  If numValues is less than the current size, values at indices larger than numValues are removed.
 	 *
 	 * @param numValues the number of values to resize this array to.
-	 * @param val the number to initialize newly created values to, if needed.
+	 * @param value the number to initialize newly created values to, if needed.
 	 */
 	template<typename T>
-	void resize(const unsigned int numValues, const T & val = 0);
+	void resize(const unsigned int numValues, const T & value = 0);
 
 	/**
 	 * Attach an hdf5 controller to this XdmfArray.
@@ -277,6 +284,7 @@ protected:
 
 	XdmfArray();
 	virtual ~XdmfArray();
+	virtual void populateItem(const std::map<std::string, std::string> & itemProperties, std::vector<boost::shared_ptr<XdmfItem> > & childItems);
 
 private:
 
@@ -287,7 +295,7 @@ private:
 	class Clear;
 	class CopyArrayValues;
 
-	template<typename T>
+	template <typename T>
 	class CopyValues;
 
 	class GetCapacity;
@@ -296,20 +304,26 @@ private:
 	class GetSize;
 	class GetType;
 
-	template<typename T>
+	template <typename T>
 	class GetValuesCopy;
 
 	class GetValuesPointer;
 	class GetValuesString;
 	class InternalizeArrayPointer;
 	class NewArray;
+
+	template <typename T>
+	class PushBack;
+
 	class Reserve;
 
-	template<typename T>
+	template <typename T>
 	class Resize;
 
 	struct NullDeleter;
 
+	void initialize(const std::string & type, const unsigned int precision);
+
 	/**
 	 * After setValues(const T * const array) is called, XdmfArray stores a pointer that is not allowed to be modified through
 	 * the XdmfArray API.  If the user desires to modify the contents of the pointer, they must do so without calling any

XdmfArray.tpp

 // Includes
 #include "XdmfArray.hpp"
 
-template<typename T>
+template <typename T>
 class XdmfArray::CopyValues : public boost::static_visitor <void> {
 public:
 
@@ -41,7 +41,7 @@ private:
 	const unsigned int mValuesStride;
 };
 
-template<typename T>
+template <typename T>
 class XdmfArray::GetValuesCopy : public boost::static_visitor <void> {
 public:
 
@@ -81,7 +81,27 @@ private:
 	const unsigned int mValuesStride;
 };
 
-template<typename T>
+template <typename T>
+class XdmfArray::PushBack : public boost::static_visitor <void> {
+public:
+
+	PushBack(const T & val) :
+		mVal(val)
+	{
+	}
+
+	template<typename U>
+	void operator()(boost::shared_ptr<std::vector<U> > & array) const
+	{
+		array->push_back((U)mVal);
+	}
+
+private:
+
+	const T & mVal;
+};
+
+template <typename T>
 class XdmfArray::Resize : public boost::static_visitor <void> {
 public:
 
@@ -110,7 +130,7 @@ struct XdmfArray::NullDeleter
     }
 };
 
-template<typename T>
+template <typename T>
 void XdmfArray::copyValues(const unsigned int startIndex, const T * const valuesPointer, const unsigned int numValues, const unsigned int arrayStride, const unsigned int valuesStride)
 {
 	if(mHaveArrayPointer)
@@ -121,7 +141,7 @@ void XdmfArray::copyValues(const unsigned int startIndex, const T * const values
 	{
 		initialize<T>();
 	}
-	boost::apply_visitor( CopyValues<T>(startIndex, valuesPointer, numValues, arrayStride, valuesStride), mArray);
+	boost::apply_visitor(CopyValues<T>(startIndex, valuesPointer, numValues, arrayStride, valuesStride), mArray);
 }
 
 template <typename T>
@@ -167,11 +187,7 @@ void XdmfArray::getValuesCopy(const unsigned int startIndex, T * valuesPointer,
 	{
 		boost::apply_visitor(GetValuesCopy<T>(startIndex, valuesPointer, numValues, arrayStride, valuesStride), mArrayPointer);
 	}
-	else if(mHDF5Controller)
-	{
-		assert("Need to complete");
-	}
-	assert("Throw Exception No Data");
+	assert(false);
 }
 
 template <typename T>
@@ -193,8 +209,18 @@ boost::shared_ptr<std::vector<T> > XdmfArray::initialize()
 	return newArray;
 }
 
+template <typename T>
+void XdmfArray::pushBack(T & value)
+{
+	if(mHaveArrayPointer)
+	{
+		internalizeArrayPointer();
+	}
+	return boost::apply_visitor(PushBack<T>(value), mArray);
+}
+
 template<typename T>
-void XdmfArray::resize(const unsigned int numValues, const T & val)
+void XdmfArray::resize(const unsigned int numValues, const T & value)
 {
 	if(mHaveArrayPointer)
 	{
@@ -204,10 +230,10 @@ void XdmfArray::resize(const unsigned int numValues, const T & val)
 	{
 		initialize<T>();
 	}
-	return boost::apply_visitor(Resize<T>(numValues, val), mArray);
+	return boost::apply_visitor(Resize<T>(numValues, value), mArray);
 }
 
-template<typename T>
+template <typename T>
 void XdmfArray::setValues(const T * const arrayPointer, const unsigned int numValues, const bool transferOwnership)
 {
 	// Remove contents of internal array.
@@ -229,7 +255,7 @@ void XdmfArray::setValues(const T * const arrayPointer, const unsigned int numVa
 	mArrayPointerNumValues = numValues;
 }
 
-template<typename T>
+template <typename T>
 void XdmfArray::setValues(std::vector<T> & array, const bool transferOwnership)
 {
 	if(mHaveArrayPointer)
@@ -249,7 +275,7 @@ void XdmfArray::setValues(std::vector<T> & array, const bool transferOwnership)
 	mHaveArray = true;
 }
 
-template<typename T>
+template <typename T>
 void XdmfArray::setValues(boost::shared_ptr<std::vector<T> > array)
 {
 	if(mHaveArrayPointer)
@@ -260,7 +286,7 @@ void XdmfArray::setValues(boost::shared_ptr<std::vector<T> > array)
 	mHaveArray = true;
 }
 
-template<typename T>
+template <typename T>
 bool XdmfArray::swap(std::vector<T> & array)
 {
 	if(mHaveArrayPointer)
@@ -283,7 +309,7 @@ bool XdmfArray::swap(std::vector<T> & array)
 	}
 }
 
-template<typename T>
+template <typename T>
 bool XdmfArray::swap(boost::shared_ptr<std::vector<T> > array)
 {
 	return this->swap(*array.get());

XdmfAttribute.cpp

@@ -20,6 +20,8 @@ XdmfAttribute::~XdmfAttribute()
 	std::cout << "Deleted Attribute " << this << std::endl;
 }
 
+std::string XdmfAttribute::ItemTag = "Attribute";
+
 XdmfAttributeCenter XdmfAttribute::getAttributeCenter() const
 {
 	return mAttributeCenter;
@@ -41,7 +43,7 @@ std::map<std::string, std::string> XdmfAttribute::getItemProperties() const
 
 std::string XdmfAttribute::getItemTag() const
 {
-	return "Attribute";
+	return ItemTag;
 }
 
 std::string XdmfAttribute::getName() const
@@ -49,6 +51,23 @@ std::string XdmfAttribute::getName() const
 	return mName;
 }
 
+void XdmfAttribute::populateItem(const std::map<std::string, std::string> & itemProperties, std::vector<boost::shared_ptr<XdmfItem> > & childItems)
+{
+	std::map<std::string, std::string>::const_iterator name = itemProperties.find("Name");
+	if(name != itemProperties.end())
+	{
+		mName = name->second;
+	}
+	else
+	{
+		assert(false);
+	}
+	mAttributeCenter = XdmfAttributeCenter::New(itemProperties);
+	mAttributeType = XdmfAttributeType::New(itemProperties);
+
+	XdmfDataItem::populateItem(itemProperties, childItems);
+}
+
 void XdmfAttribute::setAttributeCenter(const XdmfAttributeCenter & attributeCenter)
 {
 	mAttributeCenter = attributeCenter;

XdmfAttribute.hpp

@@ -18,6 +18,7 @@ public:
 
 	XdmfNewMacro(XdmfAttribute);
 	LOKI_DEFINE_VISITABLE(XdmfAttribute, XdmfDataItem)
+	static std::string ItemTag;
 
 	/**
 	 * Get the XdmfAttributeCenter associated with this attribute.
@@ -69,6 +70,7 @@ protected:
 
 	XdmfAttribute();
 	virtual ~XdmfAttribute();
+	virtual void populateItem(const std::map<std::string, std::string> & itemProperties, std::vector<boost::shared_ptr<XdmfItem> > & childItems);
 
 private:
 

XdmfAttributeCenter.cpp

@@ -35,13 +35,48 @@ XdmfAttributeCenter XdmfAttributeCenter::Node()
 
 XdmfAttributeCenter::XdmfAttributeCenter(const std::string & name) :
 	mName(name)
-{};
+{
+}
 
 XdmfAttributeCenter::XdmfAttributeCenter(const XdmfAttributeCenter & attributeCenter):
   mName(attributeCenter.mName)
 {
 }
 
+XdmfAttributeCenter XdmfAttributeCenter::New(const std::map<std::string, std::string> & itemProperties)
+{
+	std::map<std::string, std::string>::const_iterator center = itemProperties.find("Center");
+	if(center != itemProperties.end())
+	{
+		const std::string centerVal = center->second;
+		if(centerVal.compare("Grid") == 0)
+		{
+			return Grid();
+		}
+		else if(centerVal.compare("Cell") == 0)
+		{
+			return Cell();
+		}
+		else if(centerVal.compare("Face") == 0)
+		{
+			return Face();
+		}
+		else if(centerVal.compare("Edge") == 0)
+		{
+			return Edge();
+		}
+		else if(centerVal.compare("Node") == 0)
+		{
+			return Node();
+		}
+		else
+		{
+			assert(false);
+		}
+	}
+	assert(false);
+}
+
 XdmfAttributeCenter& XdmfAttributeCenter::operator=(const XdmfAttributeCenter & attributeCenter)
 {
   if(this != &attributeCenter)
@@ -68,5 +103,5 @@ std::string XdmfAttributeCenter::getName() const
 
 void XdmfAttributeCenter::getProperties(std::map<std::string, std::string> & collectedProperties) const
 {
-	collectedProperties["Center"] = this->mName;
+	collectedProperties["Center"] = mName;
 }

XdmfAttributeCenter.hpp

@@ -23,6 +23,8 @@ class XdmfAttributeCenter : public XdmfItemProperty {
 
 public:
 
+	friend class XdmfAttribute;
+
 	// Supported Xdmf Attribute Centers
 	static XdmfAttributeCenter Grid();
 	static XdmfAttributeCenter Cell();
@@ -71,6 +73,8 @@ protected:
 
 private:
 
+	static XdmfAttributeCenter New(const std::map<std::string, std::string> & itemProperties);
+
 	std::string mName;
 };
 

XdmfAttributeType.cpp

@@ -45,13 +45,56 @@ XdmfAttributeType XdmfAttributeType::GlobalId()
 
 XdmfAttributeType::XdmfAttributeType(const std::string & name) :
 	mName(name)
-{};
+{
+}
 
 XdmfAttributeType::XdmfAttributeType(const XdmfAttributeType & attributeType):
 	mName(attributeType.mName)
 {
 }
 
+XdmfAttributeType XdmfAttributeType::New(const std::map<std::string, std::string> & itemProperties)
+{
+	std::map<std::string, std::string>::const_iterator type = itemProperties.find("AttributeType");
+	if(type != itemProperties.end())
+	{
+		const std::string typeVal = type->second;
+		if(typeVal.compare("None") == 0)
+		{
+			return NoAttributeType();
+		}
+		else if(typeVal.compare("Scalar") == 0)
+		{
+			return Scalar();
+		}
+		else if(typeVal.compare("Vector") == 0)
+		{
+			return Vector();
+		}
+		else if(typeVal.compare("Tensor") == 0)
+		{
+			return Tensor();
+		}
+		else if(typeVal.compare("Matrix") == 0)
+		{
+			return Matrix();
+		}
+		else if(typeVal.compare("Tensor6") == 0)
+		{
+			return Tensor6();
+		}
+		else if(typeVal.compare("GlobalId") == 0)
+		{
+			return GlobalId();
+		}
+		else
+		{
+			assert(false);
+		}
+	}
+	assert(false);
+}
+
 XdmfAttributeType& XdmfAttributeType::operator=(const XdmfAttributeType & attributeType)
 {
 	if(this != &attributeType)
@@ -78,5 +121,5 @@ std::string XdmfAttributeType::getName() const
 
 void XdmfAttributeType::getProperties(std::map<std::string, std::string> & collectedProperties) const
 {
-	collectedProperties["AttributeType"] = this->mName;
+	collectedProperties["AttributeType"] = mName;
 }

XdmfAttributeType.hpp

@@ -25,6 +25,8 @@ class XdmfAttributeType : public XdmfItemProperty {
 
 public:
 
+	friend class XdmfAttribute;
+
 	// Supported Xdmf Attribute Types
 	static XdmfAttributeType NoAttributeType();
 	static XdmfAttributeType Scalar();
@@ -75,6 +77,8 @@ protected:
 
 private:
 
+	static XdmfAttributeType New(const std::map<std::string, std::string> & itemProperties);
+
 	std::string mName;
 };
 

XdmfDataItem.cpp

@@ -29,6 +29,17 @@ boost::shared_ptr<const XdmfArray> XdmfDataItem::getArray() const
 	return mArray;
 }
 
+void XdmfDataItem::populateItem(const std::map<std::string, std::string> & itemProperties, std::vector<boost::shared_ptr<XdmfItem> > & childItems)
+{
+	for(std::vector<boost::shared_ptr<XdmfItem> >::const_iterator iter = childItems.begin(); iter != childItems.end(); ++iter)
+	{
+		if(boost::shared_ptr<XdmfArray> array = boost::shared_dynamic_cast<XdmfArray>(*iter))
+		{
+			this->setArray(array);
+		}
+	}
+}
+
 void XdmfDataItem::setArray(boost::shared_ptr<XdmfArray> array)
 {
 	mArray = array;

XdmfDataItem.hpp

@@ -46,6 +46,7 @@ protected:
 
 	XdmfDataItem();
 	virtual ~XdmfDataItem();
+	virtual void populateItem(const std::map<std::string, std::string> & itemProperties, std::vector<boost::shared_ptr<XdmfItem > > & childItems);
 
 private:
 

XdmfDomain.cpp

@@ -18,6 +18,8 @@ XdmfDomain::~XdmfDomain()
   std::cout << "Deleted Domain " << this << std::endl;
 }
 
+std::string XdmfDomain::ItemTag = "Domain";
+
 void XdmfDomain::insert(boost::shared_ptr<XdmfGrid> grid)
 {
 	mGrids.push_back(grid);
@@ -51,7 +53,7 @@ std::map<std::string, std::string> XdmfDomain::getItemProperties() const
 
 std::string XdmfDomain::getItemTag() const
 {
-	return "Domain";
+	return ItemTag;
 }
 
 unsigned int XdmfDomain::getNumberOfGrids() const
@@ -59,6 +61,14 @@ unsigned int XdmfDomain::getNumberOfGrids() const
 	return mGrids.size();
 }
 
+void XdmfDomain::populateItem(const std::map<std::string, std::string> & itemProperties, std::vector<boost::shared_ptr<XdmfItem> > & childItems)
+{
+	for(std::vector<boost::shared_ptr<XdmfItem> >::const_iterator iter = childItems.begin(); iter != childItems.end(); ++iter)