[xsl] Re: followup on multi-level grouping/sorting/position

Subject: [xsl] Re: followup on multi-level grouping/sorting/position
From: Bruce D'Arcus <bdarcus@xxxxxxxxx>
Date: Sat, 30 Apr 2005 11:35:50 -0400
OK, I JUST realized I wasn't very careful in transferring the example I had working to the new template (based on Mike's suggestion), and missed a crucial bit. I can only chalk it up to deadline-induced psychosis.

Anyway, in case anyone else stumbles on this issue passing parameters across multi-grouping-levels, my problem was that inner group needs to switch context to the variable constructed in the outer group before proceeding, and I was missing that.

I do have a couple of further questions on this below that in part relate to performance:

<xsl:template match="db:citation" mode="sort_citation_author-year">
<!-- store citation for future use -->
<xsl:variable name="citation" select="."/>
<xsl:variable name="local-cite-style" select="db:biblioref/@xrefstyle"/>
<xsl:variable name="idref"
select="db:biblioref/@linkend, course:reading/@refid"/>
<xsl:variable name="bibref"
select="$enhanced-biblist/mods:modsCollection/mods:mods[@ID=$idref]"/>
<bib:span class="citation">
<xsl:for-each-group select="$bibref" group-by="@bib:sort-on">
<xsl:sort select="current-grouping-key()"/>
<xsl:variable name="refs-for-author-sorted-by-year"
as="element(mods:mods)*">
<xsl:perform-sort select="current-group()">
<xsl:sort select="bib:year"/>
</xsl:perform-sort>
</xsl:variable>
<xsl:variable name="first-ref-for-author" as="element(mods:mods)"
select="$refs-for-author-sorted-by-year[1]"/>
<xsl:variable name="last-ref-for-author" as="element(mods:mods)"
select="$refs-for-author-sorted-by-year[position() = last()]"/>
<xsl:for-each-group select="$refs-for-author-sorted-by-year" group-adjacent="bib:year">
<!-- the above and below - first a for-each-group selecting the variable from the outer group, and then the for-each selecting the current-group() - were the crucial bits I had wrong-->
<xsl:for-each select="current-group()">
<xsl:variable name="first-in-author-group"
select=". is $first-ref-for-author" as="xs:boolean"/>
<xsl:variable name="last-in-author-group"
select=". is $last-ref-for-author" as="xs:boolean"/>
<xsl:apply-templates select="." mode="citation_author-year">
<xsl:with-param name="first-in-author-group"
select="$first-in-author-group"/>
<xsl:with-param name="last-in-author-group"
select="$last-in-author-group"/>
<xsl:with-param name="local-cite-style" select="$local-cite-style"/>
<xsl:with-param name="cite-ref" select="$citation/db:biblioref[@linkend='{@ID}']" as="element()"/>
</xsl:apply-templates>
</xsl:for-each>
</xsl:for-each-group>
<xsl:if test="position() != last()">; </xsl:if>
</xsl:for-each-group>
</bib:span>
</xsl:template>


OK, so I apply the above template within this template, which in turn is called from the main document stylesheet:

<xsl:template name="bib:format-citation">
<xsl:param name="output-format" as="xs:string"/>
<!-- hold an intermediate citation in a temporary tree, to then run output stylesheets on -->
<xsl:variable name="intermediate-citation">
<xsl:value-of select="$style-citation/cs:prefix"/>
<xsl:choose>
<xsl:when test="$citeclass='author-year'">
<xsl:apply-templates select="." mode="sort_citation_author-year">
<xsl:with-param name="output-format" select="$output-format" as="xs:string" tunnel="yes"/>
</xsl:apply-templates>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="db:biblioref" mode="otherwise"/>
</xsl:otherwise>
</xsl:choose>
<xsl:value-of select="$style-citation/cs:suffix"/>
</xsl:variable>
<xsl:choose>
<xsl:when test="$output-format='latex'">
<xsl:apply-templates select="$intermediate-citation" mode="output-latex"/>
</xsl:when>
<xsl:when test="$output-format='xhtml'">
<xsl:apply-templates select="$intermediate-citation" mode="output-xhtml"/>
</xsl:when>
</xsl:choose>
</xsl:template>


I don't really understand some of the nuances here (was reading about sequences, but not sure I fully understand the implications). Is there a way to make this more efficient, but keep it nicely modularized (as it is now)?

Also, there are two bits of formatting: that related to the bibliographic input data, and that related to the specific citation.

So, (Doe 2000, page 23): the "Doe 2000" is drawn from the mods:mods element that is pointed to by the db:biblioref/@linkend value, while the "page 23" is drawn from db:citation/db:biblioref; e.g.:

<db:biblioref linkend="doe99" unit="page" begin="23"/>

So after reworking the code radically, I now get the first part working nicely, but am not sure the best way to access the second, given I'm now working in a different tree. Above I'm trying to pass a parameter that is the original db:biblioref element. Does that seem sensible?

Bruce

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