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Old January 2nd, 2008, 12:15 PM
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Default Removing duplicate entries

Hi All,

I am a newbie to XSLT and I had a questions regarding removing duplicates in XML.

My XML looks something like this:

<item xsi:type="ns1:vendorProcess">
<waferProcessCode xsi:type="ns1:waferProcessCodeType">0.18C1P4M33.18 </waferProcessCode>
<waferSize xsi:type="xsd:integer">8</waferSize>
<fabCode xsi:type="ns1:fabCodeType">E_CHRT0608</fabCode>
<roadmapIndicator xsi:type="ns1:roadmapIndicatorType"/>
<riskStatus xsi:type="ns1:riskStatus">R</riskStatus>
<item xsi:type="ns1:vendorProcess">
<waferProcessCode xsi:type="ns1:waferProcessCodeType">0.18C1P4M33.18 </waferProcessCode>
<waferSize xsi:type="xsd:integer">8</waferSize>
<fabCode xsi:type="ns1:fabCodeType">E_MAGNC308</fabCode>
<roadmapIndicator xsi:type="ns1:roadmapIndicatorType"/>
<riskStatus xsi:type="ns1:riskStatus">R</riskStatus>

I am trying to pickout the waferProcessCode and assign it to a radio button. But Right now, my xslt code shows up duplicates i.e., for above example I get 2 radio buttons with the same value "0.18C1P4M33.18". I would want just one radio button to show up irrespective of how many ever similar values are there for a waferProcessCode.

Can someone pls help me how I need to go about doing that?? Any suggestions or sample code would be of gr8 help to put me in the right direction.

My xslt file is as follows:

<xsl:template match="/">
<xsl:apply-templates select="//waferProcessCode" />

<xsl:template match="waferProcessCode">
<br />
<input type="radio" name="results">
<xsl:attribute name="value">
<xsl:apply-templates />

<xsl:apply-templates />


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Old January 2nd, 2008, 12:25 PM
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There are different ways to get unique results, with XSLT 1.0 one way is to use e.g.
<xsl:template match="/">
<xsl:apply-templates select="//waferProcessCode[not(. = preceding-sibling::waferProcessCode)]" />
Another is to use Muenchian grouping and process only the first item in a group, see http://www.jenitennison.com/xslt/grouping/index.xml

With XSLT 2.0 you have can use xsl:for-each-group.

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Old January 2nd, 2008, 12:29 PM
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Removal of duplicates is often called "grouping", and you will find many references to grouping techniques if you search under this heading. XSLT 2.0 has a construct xsl:for-each-group designed to make this kind of problem easy to solve. In XSLT 1.0 it's harder, but there are techniques for doing it: see http://www.jenitennison.com/xslt/grouping.

Michael Kay
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference
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