xslt - msxsl:node-set() not recognized -

i trying pull nodes out of node set stored in variable using msxsl:node-set() function , not getting anything. xml looks this:

<root>   <items olditemnumber="100" newitemnumber="200">     <item itemnumber="100" itemaliascode="1001" itemcode="x" />     <item itemnumber="100" itemaliascode="1002" itemcode="x" />     <item itemnumber="200" itemaliascode="2001" itemcode="x" />     <item itemnumber="200" itemaliascode="2003" itemcode="x" />     <item itemnumber="100" itemaliascode="1003" itemcode="p" />     <item itemnumber="100" itemaliascode="1004" itemcode="p" />     <item itemnumber="200" itemaliascode="2002" itemcode="p" />   </items> </root> 

in xslt try populate variable subset of nodes , call them using msxsl:node-set() function. doesn't return however. xslt looks this:

<?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/xsl/transform"                               xmlns:msxsl="urn:schemas-microsoft-com:xslt">  <xsl:template match="//root">    <xsl:variable name="olditemnumber" select="/items/@olditemnumber"/>    <xsl:variable name="newitemnumber" select="/items/@newitemnumber"/>    <xsl:variable name="olditems">      <xsl:value-of select="//item[@itemnumber = $olditemnumber]"/>    </xsl:variable>    <xsl:variable name="newitems">      <xsl:value-of select="//item[@itemnumber = $newitemnumber]"/>    </xsl:variable>    <xsl:for-each select="msxsl:node-set($olditems)/item">      ...work    </xsl:for-each>  </xsl:template> </xsl:stylesheet> 

the xslt skips on for-each loop, though see in watch the xpath query grabs right nodes in assigning variables. watch tells me msxsl:node-set() function undefined. appreciated. missing?

<?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/xsl/transform"                               xmlns:msxsl="urn:schemas-microsoft-com:xslt">  <xsl:template match="//root">    <xsl:variable name="olditemnumber" select="/items/@olditemnumber"/>    <xsl:variable name="newitemnumber" select="/items/@newitemnumber"/>    <xsl:variable name="olditems" select="//item[@itemnumber = $olditemnumber]"/>    <xsl:variable name="newitems" select="//item[@itemnumber = $newitemnumber]"/>    <xsl:for-each select="$olditems">      ...work    </xsl:for-each>  </xsl:template> </xsl:stylesheet> 

msxsl:node-set converting result tree fragment (a.k.a. rtf) node set, not needed on case.

xsl:value-of creating text nodes, don't use selecting nodes of input tree want further query/process.