Here's the second issue I've no clue how to solve (beyond Wendell's 
suggestion about using temporary trees).  I assume I may want to 
somehow create a virtual element in the temporary tree that indicates 
the position of the unique linkend value in the document (and between 
citations), but I'm not really sure.



Anyway, again, the original message (with slightly modified source 
example).



I've got another design question that I find difficult to label with a 
neat subject line.



I'm continuing working on my bibliographic/citation stylesheets, and 
now need to tackle two new classes, with similar issues.



The most difficult one is note (footnote/endnote) style, whereby 
rendering of citations is determined by their relative position within 
the text.  For example, we have:



1)  First/subsequent.



On the first occurrence of a citation reference, we have one rendering. 
 On all subsequent, we have another (shorter).



2)  Ibid/Idem, op.cit.



When a parameter is switched on, then if one has the same single 
citation repeated immediately subsequent, then it gets rendered as 
"Ibid", if the same group of citations repeat, it's "Idem".



My current code processes bibliography and citations in separate modes, 
and there's not really any interaction between them (which is actually 
a problem in some ways because the bib records get rendered regardless 
of whether or not they're cited in the text).  But here that won't 
work; rendering of both citations and bib list needs to get driven by 
the citations.



The other class with a related problem is numbered style, whereby 
citations get numbered based on their occurrence in the text (if 
repeated, though, there's no new number), and then the bibliography 
gets sorted by that number.  So, you get [1] and [2-4] and [1, 5]

in text.



So how do I approach this problem?  Again, using 2.0, where I am using 
temporary trees.



Bruce
=== input ===

<?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"/></citation>.</para>

    <para>Some more citations: <citation><biblioref 
linkend="one"/><biblioref

    linkend="two"/></citation>.</para>

  </section>

  <bibliography>

    <modsCollection xmlns="http://www.loc.gov/mods/v3">

      <mods ID="one">

	<name type="personal">

	  <namePart type="given">John</namePart>

	  <namePart type="family">Doe</namePart>

	  <role>

	    <roleTerm type="text">author</roleTerm>

	  </role>

	</name>

	<titleInfo>

	  <title>Some Title</title>

	</titleInfo>

	<originInfo>

	  <dateIssued>1999</dateIssued>

	</originInfo>

      </mods>

      <mods ID="two">

	<name type="personal">

	  <namePart type="given">John</namePart>

	  <namePart type="family">Doe</namePart>

	  <role>

	    <roleTerm type="text">author</roleTerm>

	  </role>

	</name>

	<titleInfo>

	  <title>Another Title</title>

	</titleInfo>

	<originInfo>

	  <dateIssued>1999</dateIssued>

	</originInfo>

      </mods>

    </modsCollection>

  </bibliography>

</article>