Microsoft XML - TargetNamespace not getting validated

Author

TargetNamespace not getting validated

Naren

2007-03-30, 7:17 pm

Hello Guys,

I am pasting a code which I have written using MSXML6.0 in C++ for XML
Schema Validation
I need to know as to why this does not fail for an incorrect targetnamespace
inside the XML file.

//Code
int Validate(wchar_t* xml,wchar_t* xsd,wchar_t* targetns)

{

HRESULT hr = S_OK;

if(xml && xsd)

{

IXMLDOMDocument* pXml = NULL,*pXsd = NULL;

IXMLDOMElement* pXsdRoot = NULL;

IXMLDOMSchemaCollection* pSchemaCache = NULL;

IXMLDOMDocument2* pXml2 = NULL;

IXMLDOMParseError *pErr = NULL;

VARIANT vSchemas1,vSchemas2,vXMLFile,vXSDFile;

VariantInit(&vSchemas1);//VariantClear can release the XsdRoot

VariantInit(&vSchemas2);

VariantInit(&vXMLFile);

VariantInit(&vXSDFile);

hr = CoCreateInstance(CLSID_DOMDocument60,

NULL,

CLSCTX_INPROC_SERVER,

IID_IXMLDOMDocument,

(void**)&pXml);

if(FAILED(hr) || !pXml)

goto Clean;

hr = CoCreateInstance(CLSID_DOMDocument60,

NULL,

CLSCTX_INPROC_SERVER,

IID_IXMLDOMDocument,

(void**)&pXsd);

if(FAILED(hr) || !pXsd)

goto Clean;

//now both interfaces found...

//lets load the xsd first

hr = pXsd->put_async(VARIANT_FALSE);

if(FAILED(hr))

goto Clean;

//load the XSD.

VARIANT_BOOL bSuccess = FALSE;

BSTR bXSDFile = SysAllocString(xsd);

vXSDFile.vt = VT_BSTR;

vXSDFile.bstrVal = bXSDFile;

hr = pXsd->load(vXSDFile,&bSuccess);

if(FAILED(hr))

goto Clean;

if(bSuccess == VARIANT_FALSE)

goto Clean;

hr = pXsd->get_documentElement(&pXsdRoot);

if(FAILED(hr)||!pXsdRoot)

goto Clean;

//Create a Schema Collection which you can associate to XML

hr = CoCreateInstance(CLSID_XMLSchemaCache60,

NULL,

CLSCTX_SERVER,

IID_IXMLDOMSchemaCollection,

(void**)&pSchemaCache);

if(FAILED(hr)||!pSchemaCache)

goto Clean;

vSchemas1.vt = VT_DISPATCH;

vSchemas1.punkVal = pXsdRoot;

BSTR x = SysAllocString(targetns);

hr = pSchemaCache->add(x,vSchemas1);

if(FAILED(hr))

goto Clean;

hr = pXml->QueryInterface(IID_IXMLDOMDocument2,(void**)&pXml2);

if(FAILED(hr)||!pXml2)

goto Clean;

vSchemas2.vt = VT_DISPATCH;

vSchemas2.punkVal = pSchemaCache;

hr = pXml2->putref_schemas(vSchemas2);

if(FAILED(hr)) goto Clean;

BSTR bXMLFile = SysAllocString(xml);

vXMLFile.vt = VT_BSTR;

vXMLFile.bstrVal = bXMLFile;

hr = pXml->load(vXMLFile,&bSuccess);

if(SUCCEEDED(hr) && bSuccess == VARIANT_TRUE)

{

wprintf(L"***XML %s Valid w.r.t %s\n",xml,xsd);

}

else

{

hr = pXml->get_parseError(&pErr);

if(FAILED(hr) && !pErr)

goto Clean;

DisplayError(pErr);

}

Clean:

pErr && pErr->Release();

VariantClear(&vSchemas2);

pXml2 && pXml2->Release();

SysFreeString(x);

VariantClear(&vSchemas1);

pXsd && pXsd->Release();

pXml && pXml->Release();

}

return (int)hr;

}

Thanks in Advance,

Naren.

Martin Honnen

2007-03-30, 7:17 pm

Naren wrote:

> I am pasting a code which I have written using MSXML6.0 in C++ for XML
> Schema Validation
> I need to know as to why this does not fail for an incorrect targetnamespace
> inside the XML file.

If you author a schema for a certain namespace (e.g.
http://example.com/2007/ns1) and add that to the schema cache, then try
to validate a document with the root element being in another namespace
(e.g. http://example.com/2007/ns2) the parser is supposed to look for a
schema for that namespace but does not find one. It then is supposed to
parse in so called lax validation mode meaning it will not attempt to
validate elements for which it does not find a schema definition.
So what happens is that MSXML looks at the namespace of the root element
and does not find a schema for that. That is not an error in terms of
the schema validation process. Some parsers (e.g. XmlReader in .NET 2.0)
emit a warning in that case that no schema was found but I don't think
MSXML 6 does that, it does not have a mechanism to emit warnings.

If you expect to be passed XML documents where the namespace is wrong
then consider to check that in your application, simply compare (JScript
notation)
xmlDocument.documentElement.namespaceURI
against
schemaDocument.documentElement.getAttribute('targetNamespace')

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/