Sorting problem with Xalan 1.0.0

Hi there,

after updating to Xalan 1.0.0 I have problems with the <xsl:sort> 
statement.

--- BOF XSL ---
<xsl:variable name="sortby">prod_no</xsl:variable>
<xsl:variable name="orderby">ascending</xsl:variable>

<xsl:apply-templates select="/document/content/table/record">
	<xsl:sort select="*[local-name()=string($sortby)]" 
order="{$orderby}"/>
</xsl:apply-templates>
--- EOF XSL ---

>>>>>>> Xalan Version 1.0.0, XML4J Version Xerces 1.0.3 <<<<<<<
========= Parsing file:c:/temp/web/lockCustodyView.xsl ==========
XSL Error: Attribute: order has an illegal value: {$orderby}, ...

If I remove the order="{$orderby} attribute I get the following error 
message. Parsing the XSL and XML file works but while transforming ...

Transforming...
XSL Error: pattern = '*[local-name()=string($sortby)]'
VariableReference given for variable out of context or without definition! 
 Name = sortby, source tree node: prod_no
XPATH: pattern = '*[local-name()=string($sortby)]'
VariableReference given for variable out of context or without definition! 
 Name = sortby

Here is how my XML document looks like
--- BOF XML ---
    <document name="DOCUMENT_ACCOUNT_LIST" 
mimetype="x-jdf-document/x-table-content">
      <content>
        <table>
          <record name="12">
            <prod_no>123</prod_no>
            <prod_no_form>abc</prod_no_form>
     	   </record>
         <record name="14">
            <prod_no>345</prod_no>
            <prod_no_form>ghi</prod_no_form>
    	   </record>
        </table>
      </content>
    </document>
--- EOF ---

Please 'r' if you have any comments, ideas, queries or input ...

Thanks a million,
Rainer


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