You should look at Dimitre's FXSL library; he has elevated using elements
to act as proxies for functions into an art form:-)
For literals, since there are not so any base types (although there
could be a lot less) you can probably just use xsl:choose, something like:
<xsl:function name="ns:func">
<xsl:param name="arg" as="node()"/>
<xsl:choose>
<xsl:when test="$arg instance of xs:integer">
<xsl:sequence select="ns:func-integer($arg)"/>
</xsl:when>
<xsl:when test="$arg instance of xs:string">
<xsl:sequence select="ns:func-string($arg)"/>
</xsl:when>
...
<xsl:otherwise>
<xsl:apply-templates select="$arg" mode="ns:func"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
David
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