<xsl:stylesheet xmlns:db="http://docbook.org/ns/docbook" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdoc="http://www.pnp-software.com/XSLTdoc" xmlns:cite="http://purl.org/NET/xbiblio/cite" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:course="http://purl.org/NET/xbiblio/course" version="2.0">
  
  <xdoc:doc type="stylesheet">Input driver stylesheet. To add support for a new
    document type, add the appropriate xpath expression to the citerefs variable
    select statement. Document types should be namespaced.
</xdoc:doc>

  
<xsl:variable name="chapters" select="/" />
  
<xsl:variable name="citerefs" select="($chapters)//db:biblioref/@linkend, /course:syllabus//course:reading/@refid, //cite:biblioref/@key" />
</xsl:stylesheet>






































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