restoring document context

I'm having a problem with my document context switching from the XML file I'm 
processing to a node-set contained in the XSL to back to the XML file.    I 
don't know how to get back to the XML file once I switch to the XSL node-set.  
Here's roughly what my XSL looks like:

    <xsl:variable name="unique-division-list">
      <division>
         <div><name>a</name></div>
         <div><name>b</name></div>
         <div><name>c</name></div>
         <div><name>d</name></div>
     </division>
    </xsl:variable>

...

    <xsl:for-each select="$unique-division-list/division/div">
        <xsl:sort select="name"/>
        <xsl:variable name="division" select="name"/>
  
       <!-- code to process this internal node here -->


       <xsl:for-each select="//CDRS/TOLL_CDR">
              <!-- code to process the nodes in the XML file -->

      </xsl:for-each>

    </xsl:for-each>



          



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