[xsl] combining two variables to generate XPATH

["bix xslt" <bix_xslt@xxxxxxxxxxx>]

All,

I have the following XML and XSLT, and I am having difficulty with the 
template that is labeled 'dispItem'.  Specifically, I have commented out the 
portion that provides the error (see the for-each with the $branch 
variable).  I want to take two variables as inputs and then combine them 
into a single XPATH and iterate over that XPATH.  Unfortunately, I am 
getting a 'this is not a DOM' error.  What can I do to fix this?  Thanks in 
advance!

Bix

--------------  XML   --------------


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE list SYSTEM "sort.dtd">
<?xml-stylesheet type="text/xsl" href="sort_1.xsl"?>

<list mode="normal">
  <proc id="a" />
  <proc id="h" />
  <proc type="r" id="b">
      <exec type="a">
          <item idr="c" />
          <item idr="d" />
      </exec>
  </proc>

  <proc type="e" id="c">
      <dpnd>
          <item idr="a" />
          <item idr="h" />
      </dpnd>
      <exec type="a">
          <item idr="e" />
          <item idr="f" />
      </exec>
  </proc>
  <proc id="d">
      <dpnd>
          <item idr="g" />
      </dpnd>
  </proc>
  <proc id="e" />
  <proc id="f" />

  <proc id="g" />
</list>


--------------  XSLT   --------------


<?xml version="1.0"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
   <xsl:key name="idRef" match="proc" use="@id" />

   <xsl:template match="proc" name="depn">
       <xsl:param name="node" select="." />

       <xsl:value-of select="$node/@id" />
       <xsl:if test="$node/dpnd">
           <xsl:text> (</xsl:text>
           <xsl:call-template name="dispItem">
               <xsl:with-param name="node" select="$node"/>
               <xsl:with-param name="type" select="dpnd"/>
           </xsl:call-template>
           <xsl:text>)</xsl:text>
       </xsl:if>
       <xsl:if test="$node/exec">
           <xsl:text> "</xsl:text>
           <xsl:call-template name="dispItem">
               <xsl:with-param name="node" select="$node"/>
               <xsl:with-param name="type" select="exec"/>
           </xsl:call-template>
           <xsl:text>"</xsl:text>
       </xsl:if>
       <br />
   </xsl:template>

   <xsl:template name="dispItem">
       <xsl:param name="node" />
       <xsl:param name="type" select="dpnd" />
       <xsl:value-of select="$node/@id" />
       <xsl:value-of select="$type/@idr" />
       <xsl:variable name="branch" select="concat($node,'/',$type,'/item')" 
/>
       <xsl:value-of select="$branch" />
<!--        <xsl:for-each select="$node">
           <xsl:value-of select="@idr" />
           <xsl:if test="following-sibling::*"><xsl:text>, 
</xsl:text></xsl:if>
       </xsl:for-each> -->
   </xsl:template>
</xsl:stylesheet>




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