Imported XSLT cannot create attributes for generated XML element

Question

I have two xslts. One imports the other.
The imported xslt creates XML elements with attributes and this XML is stored in a variable in the main stylesheet
If I perform the transformation with JRE prior to 1.6.0.18 then all works fine
If I use 1.6.0.18 or 1.6.0.19 then the attributes aren't added.
If I add attributes in the main xslt it works fine or if I output the element directly instead of first storing it in a variable then it also works fine.
Problem seems to be when you try to add attributes from an imported stylesheet and store the generated element in a variable.
Below two stylesheets to illustrate :
First MainStylesheet.xsl
<?xml version="1.0" encoding="UTF-8"?>
<!-- Copyright 1993-2005 Seagull Software Systems, Inc. -->
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:exsl="http://exslt.org/common"
extension-element-prefixes="exsl"
exclude-result-prefixes="xs">
<xsl:output method="xml" version="1.0" encoding="utf-8" indent="yes" />
<xsl:import href="innerstylesheet.xsl"/>
<xsl:template match="/TestData">
<xsl:variable name="generatedElementXml">
<xsl:call-template name="generateElement">
<xsl:with-param name="s">testValue</xsl:with-param>
</xsl:call-template>
</xsl:variable>
<xsl:for-each select="exsl:node-set($generatedElementXml)">
*** GeneratedElementXML {<xsl:text>
</xsl:text><xsl:copy-of select="*"></xsl:copy-of>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>Next innerstylesheet.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:exsl="http://exslt.org/common"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
extension-element-prefixes="exsl" >
        <xsl:output method="xml" version="1.0" encoding="utf-8" indent="yes"/>
        <xsl:template name="generateElement">
                   <xsl:param name="s"/>
                <TestElement testAttribute="$s" />
        </xsl:template>
</xsl:stylesheet>The result output by jres before 1.6.0.18 is :
<?xml version="1.0" encoding="UTF-8"?>
               *** GeneratedElementXML {
          <TestElement xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" testAttribute="testValue"/>
               }          The result output by jres since 1.6.0.18 is :
<?xml version="1.0" encoding="UTF-8"?>
               *** GeneratedElementXML {
          <TestElement xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
               }          Note : the 'testAttribute' attribute is missing

Answer 1

Have found the difference in the code
In both JRE1.6.0_17 & JRE1.6.0_18, the class 'com.sun.org.apache.xalan.internal.xsltc.dom.AdaptiveResultTreeImpl' has the following method
public void addUniqueAttribute(String qName, String value, int flags)
        throws SAXException
        addAttribute(qName, value);
    }In JRE1.6.0_17 the next method is
public void addAttribute(String name, String value)
     if (_openElementName != null) {
         _attributes.add(name, value);
     else {
         BasisLibrary.runTimeError(BasisLibrary.STRAY_ATTRIBUTE_ERR, name);
    }In JRE1.6.0_18 the next method is
public void addAttribute(String uri, String localName, String qname,
            String type, String value)
     if (_openElementName != null) {
         _attributes.addAttribute(uri, localName, qname, type, value);
     else {
         BasisLibrary.runTimeError(BasisLibrary.STRAY_ATTRIBUTE_ERR, qname);
    }Note - the addAttribute method has additional parameters in JRE1.6.0_18 but the call from addUniqueAttribute wasn't updated.
So in JRE1.6.0_18 addUniqueAttribute actually invokes the following method in the base package com.sun.org.apache.xml.internal.serializer.EmptySerializer
public void addAttribute(String name, String value)
        aMethodIsCalled();
void aMethodIsCalled()
        // throw new RuntimeException(err);
        return;
    }and as you can see this does nothing. Hence the fact that the attribute isn't added.