In fact, I think the function you want is:
<xsl:function name="type:is-number" as="xs:boolean">
<xsl:param name="arg" as="xs:string"/>
<xsl:sequence select="matches($arg, '\d+')"/>
</xsl:function>
This does not say what the type of the argument, originally passed to
the function was.
It might have been a string that is the string representation of a number:
"3.1415" (is a string)
but this is completely different from:
3.1415 (is a number).
What will really be useful is a function with an argument of item(),
that returns the real type of the argument.
This would be trivial to achieve if same-arity function overloading was allowed.
Does anybody know of another way?
Or shall we propose an exslt:type-of() ?
Cheers,
Dimitre Novatchev
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