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HowTo?: Remove dublicates from a node-set according to content with XT-19990725

Subject: HowTo?: Remove dublicates from a node-set according to content with XT-19990725
From: "Jarno Elovirta" <jarnose@xxxxxxxxxx>
Date: Thu, 29 Jul 1999 04:08:36 +0300
I'm trying to find a way to remove duplicate nodes from a node-set according to the content of the nodes, e.g. ignore all duplicate reference elements whose name attribute is the same. I couldn't figure out a way to do it using XPath predicates - can it be done directly with predicates or is there a way around it using XSLT somehow? Any ideas? Below is an example where an reference list created from references in the text and the duplicate references should be removed but aren't.
 
source:
 
<?xml version='1.0'?>
<document>
  This sentence contains references to something <reference name="foo" source="www.foo.com"/>. This sentence contains references to something else <reference name="bar" source="www.bar.com"/>. This sentence contains references to something as the first one <reference name="foo" source="www.foo.com"/>.
</document>
 
stylesheet:
 
<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
   xmlns="http://www.w3.org/TR/REC-html40"
   result-ns="">
 
<xsl:template match="/">
  <html>
  <body>
    <xsl:apply-templates/>   
  </body>
  </html>
</xsl:template>
 
<xsl:template match="document">
  <xsl:apply-templates/>
  <p/>
   <xsl:text>References:</xsl:text>
  <p/>
  <xsl:apply-templates mode="list" select="//reference"/>
</xsl:template>
 
<xsl:template match="reference">
  <xsl:text>[</xsl:text>
  <a href="">
    <xsl:value-of select="@name"/>
  </a>
  <xsl:text>]</xsl:text>
</xsl:template>
 
<xsl:template mode="list" match="reference">
  <xsl:text>[</xsl:text>
  <a name="#{@name}">
    <xsl:value-of select="@name"/>
  </a>
  <xsl:text>] </xsl:text>
  <a href="">
    <xsl:value-of select="@source"/>
  </a>
  <br/>
</xsl:template>

</xsl:stylesheet>
 
: Jarno - waiting for the rain
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