The XSLT 2.1 working draft supports XPath 2.1, which in turn supports
higher order functions and dynamic function invocation (also partial
function invocation, also known as currying). Saxon 9.2 EE offers this
capability in XQuery, but not yet in XSLT. It will find its way into
XSLT in the 9.3 release.
Meanwhile Saxon-EE has extensions to handle higher-order functions: see
in particular saxon:function() and saxon:call(). And of course Dimitre
Novatchev's FXSL library simulates first-class functions by building on
top of xsl:apply-templates.
Michael Kay
Saxonica
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