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#!/usr/bin/perl

...

$xslt->transform('foo.xml');
print $xslt->toString;

<?xml version="1.0" encoding="utf-8"?>
<PLMXML xmlns="http://www.plmxml.org/Schemas/PLMXMLSchema">
...
    </UserData>
  </Form>
</PLMXML>

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Tr
+ansform">
...
<xsl:value-of select="/PLMXML/Form[@subType='Part Revision Master']/Us
+erData/UserValue[@title='cage_code']/@value"/>
</xsl:template>
</xsl:stylesheet>

Works:        "/PLMXML/Form[@id='id24']/UserData/UserValue[@title='cag
+e_code']/@value"
Doesn't work: "/PLMXML/Form[@subType='Part Revision Master']"
Doesn't work: "/PLMXML/Form[@subType="Part Revision Master"]
+/UserData/UserValue[@title='cage_code']/@value"