<xsl:if test="not(function-available('str:tokenalize'))">
<func:function ....
would be nice to define alternate implementations for missing functions,
except that <xsl:if can't be in a top level scope like that.
Is there a neat way to do this, or is the simplest way to have a wrapper
function which uses function-available to decide whether to call the
built-in function or the xslt-defined one?
Sam
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