Functions as data types with XSLT 2.0 (was: Fun

I wish to know, is it possible to treat functions as
first class data types with XSLT 2.0 ..

Regards,
Mukul

--- Mukul Gandhi <mukul_gandhi@xxxxxxxxx> wrote:

> I am trying to implement a "integer sum" function in
> a
> functional manner .. My stylesheet so far is -
> 
> <?xml version="1.0"?> 
> <xsl:stylesheet
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
>                
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
>                 xmlns:fn="http://whatever"
>                 version="1.0">
>  
>  <xsl:output method="text" /> 
> 
>  <xsl:template match="/">
>     <xsl:variable name="result"
> select="fn:listSum(null,(1,2,3))" />
>     <xsl:value-of select="$result" />
>  </xsl:template>
>  
>  <xsl:function name="fn:listSum" as="xs:integer">
>     <xsl:param name="num" as="xs:integer" />
>     <xsl:param name="list" as="xs:integer+" />
>     <xsl:sequence
> select="fn:listSum($num,$list[position() &gt; 1])"
> />
>  </xsl:function>
>  
> </xsl:stylesheet>
> 
> But I am getting following error with Saxon 8.4 ..
> 
> "Warning: Running an XSLT 1.0 stylesheet with an
> XSLT
> 2.0 processor
> Error on line 10 of file:/C:/xml/xsleg/xslt/fp.xsl:
>   XPTY0004: An empty sequence is not allowed as the
> first argument of fn:listSum
> ()
> Transformation failed: Run-time errors were
> reported"
> ..
> 
> Can someone please help me ..?
> 
> Regards,
> Mukul
> 
> 
> 		
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