Re: xinclude, temp trees, and keys

<xsl:for-each-group select="//db:biblioref/@linkend" group-by=".">
           <xsl:if test="position() &gt; 1">,%20</xsl:if>
           <xsl:text>&apos;</xsl:text>
           <xsl:value-of select="."/>
           <xsl:text>&apos;</xsl:text>
         </xsl:for-each-group>

One reason is that for-each-group gives you more control over ordering in
the result than distinct-values (the order of the result of distinct-values
is implementation-defined).

Incidentally, the ' could just as well be written '.

However, I don't understand the problem well enough to know which document
you are trying to search at this point.

1)  an article
2) a book, which may have xincluded chapters (as mine does)

1)   xinclude content
2)  resolve citation references and include them
3)  work with temporary tree enhancing data where necessary
4)  pass off to main stylesheets for final rendering