Recursive substitution

I've reformatted my question:

 Input XML:
 <x>
     <define name="DEF1">
         <reg name="REG1"/>
     </define>
     
     <define name="DEF2">
         <reg name="REG2"/>
         <ref name="DEF1"/>
     </define>
      
     <block name="block1">
         <reg name="REG4"/>
         <reg name="REG3"/>
         <ref name="DEF2"/>
     </block>
 </x>
----------------------
Output Expected XML:
 
     <block name="block1">
         <reg name="REG4"/>
         <reg name="REG3"/>
         <reg name="REG2"/>
         <reg name="REG1"/>
     </block>
----------------------
But when I apply the following stylesheet I get the following: (Note the 
missing REG1 node)

     <block name="block1">
         <reg name="REG4"/>
         <reg name="REG3"/>
         <reg name="REG2"/>
     </block>

----------------------
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="2.0">
<xsl:template match="*" >
        <xsl:copy>
            <xsl:copy-of select="@*"/>
            <xsl:apply-templates/>
        </xsl:copy>
</xsl:template>

<xsl:template match="ref[(_at_)name]"> 
        <xsl:variable name="x">
            <xsl:copy-of select="//define[(_at_)name=current()/@name]/*"/>
        </xsl:variable>
        <xsl:apply-templates select="$x"/>
</xsl:template> 
    
<xsl:template match="/*/define"/>
</xsl:stylesheet>


Thanks,
Anupam.




        
                
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