I'm working on development with MSXML4.0 SP2. in VS2003 C++.
What I want is to verify validity of a certain schema if it is properly 
created according to XMLSchema 1.0 standard.
For instance,

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<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="name" type="xs:string"/>
<xs:element name="123address" type="xs:string"/>
<xs:element name="city" type="xs:string"/>
</xs:schema>
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In these schema, in the name attribute of second element, you'll see it has 
invalid value of "123address" for the name value.
I tried to examine these schema in MSXML 4.0 SP2 to prove invalidity of the 
schema but failed.

Following codes are what i used.

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 MSXML2::IXMLDOMDocument2Ptr pXmlDoc;
 pXmlDoc.CreateInstance(__uuidof(MSXML2::DOMDocument40));

 IVBMXNamespaceManagerPtr pNamespacenamanager;
 pNamespacenamanager.CreateInstance(__uuidof(MSXML2::MXNamespaceManager40));

 pXmlDoc->async = VARIANT_FALSE;
 pXmlDoc->resolveExternals = VARIANT_FALSE;
 pXmlDoc->validateOnParse = VARIANT_TRUE;
 pXmlDoc->setProperty(_T("SelectionNamespaces"), 
_T("xmlns:xs='http://www.w3.org/2001/XMLSchema'"));

 if (FALSE != pXmlDoc->load(lpszPathName))
 {
     MSXML2::IXMLDOMDocument2Ptr pXsdDoc;
     pXsdDoc.CreateInstance(__uuidof(MSXML2::DOMDocument40));

     pXsdDoc->async = VARIANT_FALSE;
     pXsdDoc->resolveExternals = VARIANT_TRUE;
     pXsdDoc->validateOnParse = VARIANT_TRUE;
     //pXsdDoc->setProperty(_T("ProhibitDTD"), VARIANT_FALSE);

     if (FALSE != pXsdDoc->load(_T("http://www.w3.org/2001/XMLSchema.xsd")))
     {
         MSXML2::IXMLDOMSchemaCollection2Ptr pSchemaCache;
         HRESULT hr = 
pSchemaCache.CreateInstance(__uuidof(MSXML2::XMLSchemaCache40));
         pSchemaCache->validateOnLoad = VARIANT_FALSE;

         pSchemaCache->add(_T("http://www.w3.org/2001/XMLSchema"), 
pXsdDoc.GetInterfacePtr());
         //pSchemaCache->add(_T("http://www.w3.org/2001/XMLSchema"), 
_T("http://www.w3.org/2001/XMLSchema.xsd"));

         pXmlDoc->schemas = pSchemaCache.GetInterfacePtr();

         MSXML2::IXMLDOMParseErrorPtr pError = pXmlDoc->validate();
         if (S_OK != pError->errorCode)
         {
             CString strReason(pError->reason.GetBSTR());
         }
     }
     else
     {
         MSXML2::IXMLDOMParseErrorPtr pError = pXsdDoc->parseError;
         CString strReason(pError->reason.GetBSTR());
         long line = pError->line;
         long linePos = pError->linepos;
     }
 }
 else
 {
     MSXML2::IXMLDOMParseErrorPtr pError = pXmlDoc->parseError;
     CString strReason(pError->reason.GetBSTR());
     long line = pError->line;
     long linePos = pError->linepos;
 }
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