First I tried to do the following:
<xsl:variable name="test-for-saxon-extensions"
select="concat(function-available('saxon:parse'),
function-available('saxon:serialize'))" />
<xsl:if test="$test-for-saxon-extensions ne 'truetrue'">
<xsl:message terminate="yes" select="'You must use Saxon-EE |
Saxon-PE | Saxon-9.2 | Saxon-9.1'"/>
</xsl:if>
It normally works but because of the way I have organized the
stylesheet, Saxon shows its error message long before the
transformation is stoped by xsl:message.
Saxon will attempt to bind functions at compile time, and gives a
compile-time error message if they can't be found. If you want to get in
first, put the function-available test in a use-when attribute on an
element containing the relevant extension function call.
Michael Kay
Saxonica
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