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RE: Template removes non-duplicate elements

Subject: RE: Template removes non-duplicate elements
From: Emmanuel Bégué <eb@xxxxxxxxxx>
Date: Sat, 14 Mar 2009 12:34:21 +0100
RE:  Template removes non-duplicate elements
Hello,

Try this:

<xsl:template match="/List">
	<List>
		<xsl:for-each-group select="Item" group-by=".">
			<xsl:copy-of select="current-group()[1]"/>
			</xsl:for-each-group>
		</List>
	</xsl:template>

The identity template is never run and therefore not
usefull; Listing 3 tries to group by elements that don't
always exist.

Regards,
EB



> -----Original Message-----
> From: Mark Wilson [mailto:mark@xxxxxxxxxxxx]
> Sent: Saturday, March 14, 2009 2:42 AM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Template removes non-duplicate elements
> 
> 
> My attempt at duplicate removal is failing in that it removes more than I 
> want it to. Listing 2 is the input file. The output file should 
> have one of 
> the two duplicate initial <item>s removed (Listing 1), everything else 
> should stay. My broken template is in Listing 3. It removes one of the 
> duplicates and two of the three non-duplicate  <Item> s. (see Listing 4).
> 
> Can someone help me fix my template?
> Thanks,
> Mark
> 
> Listing 1.
> <Item>
>         <Heading entry="subject">Monasteries</Heading>
>         <Xref xref="see">
>             <Heading entry="subject">Abbeys and Monasteries</Heading>
>         </Xref>
>     </Item>
> 
> Listing 2.
> 
> <List>
> <Item>
>         <Heading entry="subject">Monasteries</Heading>
>         <Xref xref="see">
>             <Heading entry="subject">Abbeys and Monasteries</Heading>
>         </Xref>
>     </Item>
>     <Item>
>         <Heading entry="subject">Monasteries</Heading>
>         <Xref xref="see">
>             <Heading entry="subject">Abbeys and Monasteries</Heading>
>         </Xref>
>     </Item>
>     <Item>
>         <Heading entry="subject">Abbeys and Monasteries</Heading>
>         <Level1>
>             <SubDiv1>St Nicholas. Postal Card</SubDiv1>
>         </Level1>
>     </Item>
>     <Item>
>         <Heading entry="subject">Abbeys and Monasteries</Heading>
>         <Level1>
>             <SubDiv1>Porta Coeli</SubDiv1>
>             </Level1>
>     </Item>
>     <Item>
>         <Heading entry="subject">Abbeys and Monasteries</Heading>
>         <Level1>
>             <SubDiv1>Porta Coeli</SubDiv1>
>         </Level1>
>     </Item>
>     <Item>
>         <Heading entry="subject">Abbeys and Monasteries</Heading>
>         <Level1>
>             <SubDiv1>Strahov</SubDiv1>
>             <Level2>
>                 <SubDiv2>Strahov Madonna</SubDiv2>
>                   </Level2>
>         </Level1>
>     </Item>
>     </List>
> 
> Listing 3.
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
> xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xs" 
> version="2.0">
>         <xsl:strip-space elements="*"/>
> 
> <xsl:template match="@* | node()">
>      <xsl:copy>
>        <xsl:apply-templates select="@* | node()"/>
>      </xsl:copy>
>    </xsl:template>
> 
>     <xsl:template match="/">
>         <List>
>             <xsl:for-each-group select="//Item" group-by="concat(Heading, 
> Xref/Heading)">
>                 <xsl:copy-of select="current-group()[1]" 
> copy-namespaces="no"/>
>             </xsl:for-each-group>
>         </List>
>     </xsl:template>
> 
> </xsl:stylesheet>
> 
> Listing 4.
> <List>
>     <Item>
>         <Heading entry="subject">Abbeys and Monasteries</Heading>
>         <Level1>
>             <SubDiv1>St Nicholas. Postal Card</SubDiv1>
>         </Level1>
>     </Item>
>     <Item>
>         <Heading entry="subject">Monasteries</Heading>
>         <Xref xref="see">
>             <Heading entry="subject">Abbeys and Monasteries</Heading>
>         </Xref>
>     </Item>
> </List> 
> 
> 
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