[xsl] variable question

Why does my below __variable not seems to work, while if I use the same xpath expression in place of it, it does? How can I fix this to use the variable? I just want to localize in one place the configuration for where to find the data (in the below case, on the file system, in a directory called "bib-data", where each reference is in an individual file named with the value of the citation ID).

Bruce

<?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="2.0" xmlns:mods="http://www.loc.gov/mods/v3"; xmlns:db="http://docbook.org/docbook-ng"; exclude-result-prefixes="db mods">

<xsl:output method="xhtml" encoding="UTF-8" />

<xsl:variable name="bibkey" select="db:biblioref/@linkend" /> <xsl:variable name="bibrecord" select="doc(concat('bib-data/', $bibkey, '.mods'))" />

   <xsl:template match="/">
      <html xmlns="http://www.w3.org/1999/xhtml";>
         <head>
            <title>Testing</title>
         </head>
         <body>
            <h3>Citations</h3>
            <xsl:for-each select="//$bibkey">
               <ol>
                  <li><xsl:value-of select="." /></li>
               </ol>
            </xsl:for-each>
            <h3>Titles</h3>
            <xsl:for-each select="//$bibkey">
               <xsl:value-of select="$bibrecord//mods:title" />
            </xsl:for-each>
         </body>
      </html>
   </xsl:template>

</xsl:stylesheet>

Source example:

<?xml version="1.0" encoding="utf-8"?> <article xmlns="http://docbook.org/docbook-ng";> <info> <title>Test</title> </info> <section> <info> <title>Introduction</title> </info> <para>Some citations: <citation><biblioref linkend="one"/><biblioref linkend="two"/><biblioref linkend="three"/></citation>.</para> <para>A citation with page number detail: <citation><biblioref linkend="one" units="page" begin="23" end="24" /></citation>. A citation <footnote><para>... in a footnote <citation><biblioref linkend="three" begin="234"/></citation></para></footnote>.</para> </section> <bibliography/> </article>

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