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Re: [xsl] Keeping track of processed nodes, to avoid redundant output.

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Hi John,

You can define a key that matches enElement and use the name attribute. Then you can process only the first element that matches a given value:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:key name="name" match="anElement" use="@name"/>
<xsl:template match="/">
<out><xsl:apply-templates/></out>
</xsl:template>
<xsl:template match="anElement">
<xsl:if test="generate-id(.)=generate-id(key('name', @name)[1])">
<name><xsl:value-of select="@name"/></name>
</xsl:if>
</xsl:template>
</xsl:stylesheet>

Regards,
George
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George Cristian Bina - http://aboutxml.blogspot.com/
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com

John Smith wrote:

Hello,

This is a simplified description of what I am trying to do, I have an
xml document like this:

<main>
  <someElement>
    <anElement name="John" />
  </someElement>
  <someElement>
    <anElement name="Jane" />
  </someElement>
  <someElement>
    <anElement name="John" />
  </someElement>
  <someElement>
    <anElement name="Jane" />
  </someElement>
</main>

and I like to retrieve each 'name' attribute from 'anElement', but I
only want to process the name once. So if the 'John' attribute is
repeated I want to somehow keep track that I have already processed
it, hence there is no need to process it again.

So for the given example I like to output something like:

<out>
  <name>John</name>
  <name>Jane</name>
</out>

Thanks,
John

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