Re: [xsl] XPath to get unique nodes based on child node attribute

["Joris Gillis" <roac@xxxxxxxxxx>]

Tempore 16:52:30, die 02/19/2005 AD, hinc in  
xsl-list@xxxxxxxxxxxxxxxxxxxxxx scripsit david <david@xxxxxxxxxx>:

> I am trying to get a node set where a child element of each node should  
> have a unique value. I think I can do this with XPath, but can't figure  
> out what how to filter it.
Hi,

The most common way to filter out unique nodes is with keys.
Try something like this:

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

<xsl:key name="description" match="*[@QText='Analysis Description:']"  
use="."/>

<xsl:template match="/">
	<xsl:copy-of  
select="//*[generate-id(key('description',.))=generate-id()]/.."/>
</xsl:template>

</xsl:stylesheet>

outputs:

<SS_Analysis>
	<Q_2676_2_Analysis_Descri QText="Analysis  
Description:">2,3,7,8-TCDD</Q_2676_2_Analysis_Descri>
</SS_Analysis>
<SS_Analysis>
	<Q_2676_2_Analysis_Descri QText="Analysis Description:">601/602  
Volatiles</Q_2676_2_Analysis_Descri>
</SS_Analysis>
<GW_Analysis>
	<Q_3692_2_Analysis_Descri QText="Analysis  
Description:">2(2-Butoxyethoxy)ethanol</Q_3692_2_Analysis_Descri>
</GW_Analysis>
<DW_Analysis>
	<Q_5066_2_Analysis_Descri QText="Analysis Description:">507  
Pesticides</Q_5066_2_Analysis_Descri>
</DW_Analysis>


regards,
--
Joris Gillis (http://www.ticalc.org/cgi-bin/acct-view.cgi?userid=38041)
Ceterum censeo XML omnibus esse utendum