Re: [xsl] grouping + global variable (?) (was re: regexs,

[Bruce D'Arcus <bdarcus@xxxxxxxxxxxxx>]

On Aug 13, 2004, at 2:58 PM, Wendell Piez wrote:

> Okay, but why are both these templates matching the same elements with 
> the same priority, in no mode? They are in conflict and your processor 
> will only use one of them (or throw an error).

Because I was totally confused!

I think my confusion was a combination of dealing with multiple 
namespaces, multiple modes, and multiple levels of processing.

The following examples work, but I'm still a bit shakey on how to 
handle all these namespace and mode issues when I expand this. For 
example, the div that wraps the output here is placed in the mods 
namespace, which clearly is not right.

=== 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"/><biblioref linkend="three"/></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>
      <mods ID="three">
	<name type="personal">
	  <namePart type="given">John</namePart>
	  <namePart type="family">Doe</namePart>
	  <role>
	    <roleTerm type="text">author</roleTerm>
	  </role>
	</name>
	<name type="personal">
	  <namePart type="given">Jane</namePart>
	  <namePart type="family">Jones</namePart>
	  <role>
	    <roleTerm type="text">author</roleTerm>
	  </role>
	</name>
	<titleInfo>
	  <title>Some Title</title>
	</titleInfo>
	<originInfo>
	  <dateIssued>1999</dateIssued>
	</originInfo>
      </mods>
    </modsCollection>
  </bibliography>
</article>

=== xslt ===

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                xmlns:xs="http://www.w3.org/2001/XMLSchema";
                xmlns:xdt="http://www.w3.org/2003/11/xpath-datatypes";
		xmlns:str="http://example.org/xslt/functions";
		xmlns:db="http://docbook.org/docbook-ng";
		xmlns:mods="http://www.loc.gov/mods/v3";
		xmlns:bib="http://www.example.org/bib";
		xmlns="http://www.loc.gov/mods/v3";
		exclude-result-prefixes="xs xdt mods str db bib"
                version="2.0">

<xsl:output method="xml" encoding="utf-8" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:template match="/">
  <xsl:apply-templates select="//mods:modsCollection"/>
</xsl:template>

<xsl:function name="bib:grouping-key" as="xs:string">
  <xsl:param name="bibref" as="element(mods:mods)" />
  <xsl:value-of separator=";">
    <xsl:for-each select="$bibref/mods:name">
      <xsl:value-of
        select="string-join((mods:namePart[@type = 'family'],
	           mods:namePart[@type = 'given']), ',')" />
    </xsl:for-each>
  </xsl:value-of>
</xsl:function>

<xsl:template match="mods:modsCollection">
  <xsl:variable name="temp">
    <xsl:apply-templates select="." mode="phase-1"/>
  </xsl:variable>
  <xsl:apply-templates select="$temp" mode="phase-2"/>
</xsl:template>

<xsl:template match="mods:modsCollection" mode="phase-1">
  <xsl:copy>
    <xsl:variable name="bibref" select="mods:mods" />
    <xsl:for-each-group select="$bibref" group-by="bib:grouping-key(.)">
      <xsl:sort select="current-grouping-key()"/>
      <xsl:for-each-group select="current-group()"
	        group-by="xs:integer(substring(mods:originInfo/mods:dateIssued|
		mods:relatedItem/mods:part/mods:date,1,4))">
	<xsl:sort select="current-grouping-key()" />
	<xsl:variable name="year" as="xs:integer"
		select="current-grouping-key()"/>
	<xsl:variable name="first" as="xs:boolean" select="position() = 1" />
	<xsl:for-each select="current-group()">
	  <mods ID="{@ID}">
	    <xsl:if test="last() > 1">
	      <key type="year-suffix">
		<xsl:number value="position()" format="a"/>
	      </key>
	    </xsl:if>
	    <xsl:copy-of select="*"/>
	  </mods>
	</xsl:for-each>
      </xsl:for-each-group>
    </xsl:for-each-group>
  </xsl:copy>
</xsl:template>

<xsl:template match="mods:modsCollection" mode="phase-2">
  <div class="bibliography">
    <xsl:apply-templates select="mods:mods"/>
  </div>
</xsl:template>

<xsl:template match="mods:mods">
  <div class="record" id="{@ID}">
    <xsl:apply-templates select="mods:titleInfo[not(@type)]"/>
    <xsl:apply-templates select="mods:key"/>
  </div>
</xsl:template>

<xsl:template match="mods:titleInfo[not(@type)]">
  <h3>
    <xsl:apply-templates select="mods:title"/>
    <xsl:apply-templates select="mods:subTitle"/>
  </h3>
</xsl:template>

<xsl:template match="mods:title">
  <xsl:apply-templates/>
</xsl:template>

<xsl:template match="mods:subTitle">
  <xsl:text>: </xsl:text>
  <xsl:apply-templates/>
</xsl:template>

<xsl:template match="mods:key">
  <p>
    <xsl:text>has suffix of </xsl:text>
    <xsl:apply-templates/>
  </p>
</xsl:template>

</xsl:stylesheet>