Coying an entire xml in a Variable using xslt - xslt

Question

How can i copy an entire xml as is in an Variable?
Below is the sample xml:
<?xml version="1.0" encoding="UTF-8"?>
<products author="Jesper">
<product id="p1">
<name>Delta</name>
<price>800</price>
<stock>4</stock>
</product>
</products>
I have tried below xslt but it is not working.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="#*|node()">
<xsl:variable name="reqMsg">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:variable>
<xsl:copy-of select="$reqMsg"/>
</xsl:template>
</xsl:stylesheet>
Regards,
Rahul

Answer 1

Your transformation fails because at a certain point, it tries to create a variable (result tree fragment) containing an attribute node. This is not allowed.
It's not really clear what you mean by "copying an entire XML to a variable". But you probably want to simply use the select attribute on the root node:
<xsl:variable name="reqMsg" select="/"/>
This will actually create variable with a node-set containing the root node of the document. Using this variable with xsl:copy-of will output the whole document.

Answer 2

<xsl:copy-of select="document('path/to/file.xml')" />
Or if you need it more than once, to avoid repeating the doc name:
<xsl:variable name="filepath" select="'path/to/file.xml'" />
…
<xsl:copy-of select="document($filepath)" />
The result of document() should be cached IIRC, so don't worry about calling it repeatedly.