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[xsl] Here’s how to eliminate duplicate elements using XSLT

2021-07-09 08:56:37
Hi Folks,

[This is a summary of yesterday's discussion, for the archives.]

I have an XML document that consists of <row> elements:


I want to eliminate duplicate rows. row[1] and row[3] have the same elements 
with the same values. They are duplicates. I only want one of them.

Michael Kay responded:

In this situation, you can use grouping:

<xsl:for-each-group select="row" group-by="x, y" composite="yes">
      <xsl:sequence select="current-group()[1]"/>

Roger: Wow! That simple for-loop is doing an enormous amount of work – grouping 
elements by their content, iterating over the groups, selecting the first of 
each group (thus, deleting the duplicates). That is beautiful code. Thank you 
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