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Sort problem

Subject: Sort problem
From: "Paolo Noya" <paolo.noya@xxxxxxxxxxx>
Date: Fri, 10 Sep 2004 17:19:49 +0200
paolo noya
I've a problem during sort node with xalan-j version 2.4.1(bundle with jdk 1.4.2_05). 
I have an XML like this:
<?xml version="1.0"?>
and I want sort by level and then by name giving a rule for mapping level with an arbitrary number.
I wrote an xml like this:
<?xml version="1.0"?>
<xsl:stylesheet  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
  xmlns:this="http://localhost/" exclude-result-prefixes="this"
    <Level pos="0"/><!--dummy level-->
    <Level pos="1">foo</Level>
    <Level pos="2">bar</Level>
    <Level pos="3">baz</Level>
<xsl:variable name="levels" select="document('')/xsl:stylesheet/this:Levels"/>
<xsl:template match="/Peoples">
    <xsl:apply-templates select="Person">
        <xsl:sort data-type="number" select="number($levels/Level[.=current()/Level]/@pos)"/>
        <xsl:sort select="Name"/>
<xsl:template match="Person">
    <xsl:value-of select="Name"/><br/>
during transfom, the element  <xsl:sort data-type="number" select="number($levels/Level[.=current()/Level]/@pos)"/> produce an excepiton javax.xml.transform.TransformerException: java.lang.NullPointerException

but if i print the <xsl:value-of select="number($levels/Level[.=current()/Level]/@pos)"/> in "Person" template I got the correct value.
If apply the same transform directly with my IE6.0 (so using msxml transformer) i obtain the correct result.
What's wrong?
It is my error suppose that the current() function inside sort element refer to selected node in apply-templates?

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