in xslt2, if I understand you correctly something like
<xsl:variable name="a" select="/"/>
<xsl:variable name="b" as="item()*">
<xsl:apply-templates mode="a" select="$a"/>
</xsl:variable>
<xsl:variable name="c" as="item()*">
<xsl:apply-templates mode="b" select="$b"/>
</xsl:variable>
<xsl:sequence select="if(deep-equal($b,$c)) then $a else $c"/>
In the above I have understood
If the second stylesheet doesn't match anything
to mean that it returns its input unchanged (which means that it must
havehad at least a default template matching everything) If you really
don't match anything so the result of the second transformation is empty
then change the last line to
<xsl:sequence select="if(empty($c)) then $a else $c"/>
David
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