One method is to test on preceding(-sibling) or following(-sibling) nodes:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output indent="yes"/>

 <xsl:template match="Instruments|Equity">
  <xsl:copy>
   <xsl:apply-templates/>
  </xsl:copy>
 </xsl:template>

 <xsl:template match="*">
  <xsl:if test="not(preceding-sibling::*[name()=name(current()) and
text()=current()/text()])">
   <xsl:copy-of select="."/>
  </xsl:if>
 </xsl:template>
</xsl:stylesheet>

Another method is to use keys for grouping with Muenchian Method:
http://www.jenitennison.com/xslt/grouping/muenchian.xml.

Joerg

----- Original Message -----
From: "Pankaj Jain" <pjain@xxxxxxxxxxx>
To: "XSL List (E-mail)" <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, October 24, 2001 12:19 AM
Subject:  using xsl to check for duplicate elements


> Hi all,
> Is there a way to check an XML file for duplicate elements and eliminate
the
> second one?  i.e. If I have the following XML:
>
>
> <?xml version="1.0" standalone="yes">
> <Instruments>
>     <Equity>
>         <ISSUE_ID>108558</ISSUE_ID>
>         <RIC>IBM.N</RIC>
>         <CTRY_ID>648</CTRY_ID>
>         <EXCH_ID>224</EXCH_ID>
>         <NAME>IBM</NAME>
>         <EXCH_ID>224</EXCH_ID>
>         <ISSUE_ID>108558</ISSUE_ID>
>         <CTRY_ID>648</CTRY_ID>
>     </Equity>
> </Instruments>
>
>
> What would I do in XSL to create a new XML file that looks like the
> following:
>
> <?xml version="1.0" standalone="yes">
> <Instruments>
>     <Equity>
>         <ISSUE_ID>108558</ISSUE_ID>
>         <RIC>IBM.N</RIC>
>         <CTRY_ID>648</CTRY_ID>
>         <EXCH_ID>224</EXCH_ID>
>         <NAME>IBM</NAME>
>     </Equity>
> </Instruments>
>
> Thanks
> Pankaj
>
> -----
> Pankaj Jain
>
>
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