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File: Data.xml
<?xml version="1.0"?>
<staff>
<employee name="J" department="sales" />
<employee name="B" department="personnel" />
<employee name="C" department="transport" />
<employee name="W" department="personnel" />
<employee name="M" department="sales" />
</staff>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" indent="yes" />
<xsl:template match="staff">
<xsl:for-each-group select="employee" group-by="@department">
<h2>
<xsl:value-of select="current-grouping-key()" />
<xsl:text> department</xsl:text>
</h2>
<xsl:for-each select="current-group()">
<p>
<xsl:value-of select="@name" />
</p>
</xsl:for-each>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>
Output:
<h2>sales department</h2>
<p>J</p>
<p>M</p>
<h2>personnel department</h2>
<p>B</p>
<p>W</p>
<h2>transport department</h2>
<p>C</p>
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