<xsl:copy-of select="document($v_file)//$v_Tag"/>
That syntax is correct so long as $v_Tag contains a node set but it is
the same as
<xsl:copy-of select="$v_Tag"/>
and would just copy the node set in the variable,
If $v_Tag contains a string then it is not correct as it would be the
same as
<xsl:copy-of select="document($v_file)//'abc'"/>
which would not be valid XPath.
David
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