Nodes, strings, branches

[lachance at chass dot utoronto dot ca (Francois Lachance)]

As promised I have reworked a stylesheet to group elements based on
attribute values. 
 
 
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="html"/>
 
<xsl:template match="/">
<xsl:call-template name="grouper">
<xsl:with-param name="nodes" select="//w[@function='item']"/>
<xsl:with-param name="listname" select="string(//w/@n)"/>
</xsl:call-template>
</xsl:template>
 
<xsl:template name="grouper">
<xsl:param name="nodes"/>
<xsl:param name="listname"/>
<xsl:param name="nodeset" select="$nodes/self::w[@n=$listname]"/>
<xsl:param name="nextset" select="$nodes/self::w[@n!=$listname]"/>
 
<!-- 
The following part was developed thanks to Craig Squires who remind
me to be mindful of datatypes or objects 
-->
 
<!-- 
the following function binds a variable to the first occurence
of an attribute node in a nodeset 
-->
<xsl:param name="tempholder"select="$nextset/@n"/>
<!-- 
the following function binds a variable to a string 
-->
<xsl:param name="nextlistname" select="string($tempholder)"/> 


<!-- 
Phil Lanch helped me figure out the very important difference between
testing on a string and testing on a node. Again the reminder re datatypes
or objects 
-->
 
<xsl:if test="$nodes"> 

 	<xsl:for-each select="$nodeset">
 	<xsl:sort select="." order="descending"/>
 	<xsl:value-of select="."/>
 	<xsl:text>   </xsl:text>
 	</xsl:for-each>
 
 	<xsl:text>   /\/\/\   </xsl:text>
 
 	<xsl:call-template name="grouper">
 	<xsl:with-param name="nodes" select="$nextset"/>
 	<xsl:with-param name="listname" select="$nextlistname"/>
 	</xsl:call-template>
 
 	<!-- 
 	*smile* try passing $tempholder instead of $nextlistname
 	in the recursive call-template
 	and compare the results on the two data sets.  
 	Any one venture an explanation?
 	-->
  
</xsl:if>

</xsl:template>
 
</xsl:stylesheet> 

************
First data set: no branching in the parent's parent node
 
<lg>
<l>The <w function="item" group="primary" n="list1">yellow</w> cab drove away.</l>
<l>The <w function="item" group="secondary" n="list2">green</w> taxi slid to a stop.</l>
<l>The <w function="item" group="primary" n="list1">red</w> truck halted briefly.<w>nonce</w></l>
<l><w>The</w> <w function="item" group="secondary" n="list2">purple</w> van sped away.</l>
</lg> 


Second data set: branching in the parent's parent node
 
<doc>
<lg>
<l>The <w function="item" group="primary" n="list1">yellow</w> cab drove away.</l>
<l>The <w function="item" group="secondary" n="list2">green</w> taxi slid to a stop.</l>
<l>The <w function="item" group="primary" n="list1">red</w> truck halted briefly.<w>nonce</w></l>
<l><w>The</w> <w function="item" group="secondary" n="list2">purple</w> van sped away.</l>
</lg>
<lg>
<w function="item" n="list5">goose</w>
</lg>
</doc> 

***
Thanks

-- 
Francois Lachance
Post-doctoral Fellow
projet HYPERLISTES project
http://www.humanities.mcmaster.ca/~hyplist/


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