Head-scratching error in an XSLT function

Hi,
The stylesheet below is causing me a headache, it contains a
function to aide in the transform of an XML Schema.
But all I'm getting from OPS is the following error:

  Failed to compile stylesheet. 1 error detected.

It reports the offending line as the last line of the
xsl:sequence element.

I'm staring at this and double checking the specs and
for the life of me I can not see what is causing the error!

Can anyone help?

BTW, can anyone recommend an XSLT debugger or some way to
get more helpful error messages?

Cheers
- Mark Gibson

<xsl:stylesheet version="2.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:xsu="http://worksmart.net/ns/xsd-util"
   exclude-result-prefixes="xsu">
       
   <xsl:key name="xsu:types"
     match="/xsd:schema/xsd:complexType|/xsd:schema/xsd:simpleType"
     use="@name"/>

   <xsl:function name="xsu:type-def" as="element()">
     <xsl:param name="elem" as="element()"/>
     <xsl:sequence
       select="if ($elem/complexType)
               then $elem/complexType
               else if ($elem/simpleType)
               then $elem/simpleType
               else if ($elem/@ref)
               then xsu:type-def(/xsd:schema/xsd:element[@name=$elem/@ref])
               else if ($elem/@type and
exists(key('xsu:types',$elem/@type)))
               then key('xsu:types',$elem/@type)
               else key('xsu:types','xsd:anyType')"/>
   </xsl:function>
</xsl:stylesheet>



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SOLVED.

Mark Gibson wrote: Well, after a long hard talking to the dog, I've solved my own
problem. It seems that there is no context item in functions in XSLT 2.0
(unlike the EXSLT functions extension in 1.0!), and key() requires three
arguments when there is no context item. Thus the XPath statement
should read:

   if ($elem/complexType)
   then $elem/complexType
   else if ($elem/simpleType)
   then $elem/simpleType
   else if ($elem/@ref)
   then xsu:type-def(root($elem)/xsd:schema/xsd:element[@name=$elem/@ref])
   else if ($elem/@type and
exists(key('xsu:types',$elem/@type,root($elem))))
   then key('xsu:types',$elem/@type,root($elem))
   else key('xsu:types','xsd:anyType',root($elem))



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