So, I guess the alternative is something like the following on every
main template?
the usual alternative to putting a global switch on a match pattern
predicate is to put it on the select attribute on the apply templates.
<xsl:apply-templates/>
<xsl:template match="*"/>
<xsl:template match="*[$foo='x']">zzz</xsl;template>
produces zzz for each element if foo is x and nothing otherwise.
The following does the same, but I think it's clearer, and it's probably
more efficient as the test only has to be done once, not on every
element that might possibly match.
<xsl:apply-templates select="*[$foo='x']"/>
or perhaps clearer
<xsl:if test="$foo='x'">
<xsl:apply-templates/>
</xsl:if
<xsl:template match="*">zzz</xsl:template>
David
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