ENH: Added GetAttributeValue method to get an attribute's value by its index.

IO/vtkXMLDataElement.cxx

@@ -21,7 +21,7 @@
 
 #include <ctype.h>
 
-vtkCxxRevisionMacro(vtkXMLDataElement, "1.13");
+vtkCxxRevisionMacro(vtkXMLDataElement, "1.14");
 vtkStandardNewMacro(vtkXMLDataElement);
 
 //----------------------------------------------------------------------------
@@ -225,6 +225,17 @@ const char* vtkXMLDataElement::GetAttributeName(int idx)
   return this->AttributeNames[idx];
 }
 
+//----------------------------------------------------------------------------
+const char* vtkXMLDataElement::GetAttributeValue(int idx)
+{
+  if (idx < 0 || idx >= this->NumberOfAttributes)
+    {
+    return 0;
+    }
+
+  return this->AttributeValues[idx];
+}
+
 //----------------------------------------------------------------------------
 void vtkXMLDataElement::PrintXML(ostream& os, vtkIndent indent)
 {

IO/vtkXMLDataElement.h

@@ -115,6 +115,11 @@ public:
   // Returns 0 if there is no such attribute.
   const char* GetAttributeName(int idx);
 
+  // Description:
+  // Get the n-th attribute value.
+  // Returns 0 if there is no such attribute.
+  const char* GetAttributeValue(int idx);
+
   // Description:
   // Remove all attributes.
   virtual void RemoveAllAttributes();