About XLT & IXMLDOM ...

I have irresistable problem when I am trying to work with *.xlt file as XML document. May be somebody met some problem like that:

CComPtr<IXMLDOMDocument> tempXML;
IXMLDOMNode* iXMLRoot;

.... initial actions

IXMLDOMElement* INewParam;
hr = tempXML->createElement(L"xsl:param",&INewParam);

VARIANT vLang;
vLang.vt=VT_BSTR;
vLang.bstrVal = L"Lang";
hr = INewParam->setAttribute(L"name", vLang);

.... hr = OK!!!!

VARIANT vLangTest;
hr = INewParam->getAttribute(L"name", &vLang);

Problem is vLangTest is equal VT_BSTR ""!!!

It means that "setAttribute" doesn't put information about attribute "name".

XLT-document which I load is :

<?xml version="1.0" encoding="windows-1251"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="windows-1251"/>
<xsl:param select="'English'" name="Lang"/>
<xsl:include href="Quest.xsl"/>
</xsl:stylesheet>

May be I can't work with xlt-documents like I work with XML-documents?

Thanks.