Remove duplicate values in child nodes of XML file using XSLT - xslt

Question

I have the below xml data and I want remove the duplicate values from this xml.
<Report_Data>
<Report_Entry>
<Classifications_group>
<ClassificationGroupName Descriptor="EEO-1 Job Categories">
</ClassificationGroupName>
<ClassificationDescription>Professionals</ClassificationDescription>
</Classifications_group>
<Classifications_group>
<ClassificationGroupName Descriptor="Hartford Job Category">
</ClassificationGroupName>
<ClassificationDescription>Other</ClassificationDescription>
</Classifications_group>
<Classifications_group>
<ClassificationGroupName Descriptor="Hartford Job Category">
</ClassificationGroupName>
<ClassificationDescription>Other</ClassificationDescription>
</Classifications_group>
</Report_Entry>
<Report_Entry>
<Classifications_group>
<ClassificationGroupName Descriptor="EEO-1 Job Categories">
</ClassificationGroupName>
<ClassificationDescription>Administrative Support Workers</ClassificationDescription>
</Classifications_group>
<Classifications_group>
<ClassificationGroupName Descriptor="Hartford Job Category">
</ClassificationGroupName>
<ClassificationDescription>Other</ClassificationDescription>
</Classifications_group>
</Report_Entry>
</Report_Data>
I have used the following XSLT to remove duplicate values.
<?xml version="1.0" encoding="UTF-8"?>
<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:variable name="CRLF" select="'
'"/>
<xsl:output indent="no" method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="Report_Data">
<xsl:value-of select="'ClassificationGroupName,ClassificationDescription'"/>
<xsl:value-of select="$CRLF"/>
<xsl:for-each select="Report_Entry">
<xsl:for-each-group select="Classifications_group" group-by="concat(ClassificationGroupName/#Descriptor, '|', ClassificationDescription)">
<xsl:value-of select="ClassificationGroupName/#Descriptor"/>
<xsl:value-of select="','"/>
<xsl:value-of select="ClassificationDescription"/>
<xsl:value-of select="$CRLF"/>
</xsl:for-each-group>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
Output:
ClassificationGroupName,ClassificationDescription
EEO-1 Job Categories,Professionals
Hartford Job Category,Other
EEO-1 Job Categories,Administrative Support Workers
Hartford Job Category,Other
Excepted output:
ClassificationGroupName,ClassificationDescription
EEO-1 Job Categories,Professionals
Hartford Job Category,Other
EEO-1 Job Categories,Administrative Support Workers
With the code that I have written, it removes duplicates only within the Report_Entry. I want to remove if there any other duplicate values with both ClassificationGroupName and ClassificationDescription of Classifications_group in any other Report_Entry as well.
What are the changes do I need to do to get the expected output?

Answer 1

I think you want to group all entries e.g. in XSLT 3 with a composite key
<xsl:template match="Report_Data">
<xsl:for-each-group select="Report_Entry/Classifications_group" composite="yes" group-by="ClassificationGroupName/#Descriptor, ClassificationDescription">
<xsl:value-of select="current-grouping-key()" separator=", "/>
<xsl:text>
</xsl:text>
</xsl:for-each-group>
</xsl:template>
or, with your XSLT 2 approach, using
<xsl:template match="Report_Data">
<xsl:value-of select="'ClassificationGroupName,ClassificationDescription'"/>
<xsl:value-of select="$CRLF"/>
<xsl:for-each-group select="Report_Entry/Classifications_group" group-by="concat(ClassificationGroupName/#Descriptor, '|', ClassificationDescription)">
<xsl:value-of select="ClassificationGroupName/#Descriptor"/>
<xsl:value-of select="','"/>
<xsl:value-of select="ClassificationDescription"/>
<xsl:value-of select="$CRLF"/>
</xsl:for-each-group>
</xsl:template>