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    copied!<p>Here is a stylesheet using <code>for-each-group</code> twice:</p> <pre><code>&lt;xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output indent="yes"/&gt; &lt;xsl:template match="mappings"&gt; &lt;reductions&gt; &lt;xsl:for-each-group select="mapping" group-by="value"&gt; &lt;reduction&gt; &lt;group&gt;&lt;xsl:value-of select="current-grouping-key()"/&gt;&lt;/group&gt; &lt;xsl:for-each-group select="current-group()/key" group-by="."&gt; &lt;xsl:copy-of select="."/&gt; &lt;/xsl:for-each-group&gt; &lt;/reduction&gt; &lt;/xsl:for-each-group&gt; &lt;/reductions&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>[edit] When I run the posted stylesheet with Saxon 9.4 HE against the input</p> <pre><code>&lt;mappings&gt; &lt;mapping&gt; &lt;key&gt;6718&lt;/key&gt; &lt;value attribute="content_type"&gt;Info Page&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;35905&lt;/key&gt; &lt;value attribute="content_type"&gt;Press releases&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;6718&lt;/key&gt; &lt;value attribute="content_type"&gt;Info Page&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;36941&lt;/key&gt; &lt;value attribute="content_type"&gt;Press releases&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;24920&lt;/key&gt; &lt;value attribute="content_type"&gt;Press releases&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;40244&lt;/key&gt; &lt;value attribute="content_type"&gt;Press releases&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;36639&lt;/key&gt; &lt;value attribute="content_type"&gt;Press releases&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;1861&lt;/key&gt; &lt;value attribute="content_type"&gt;Press releases&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;2280&lt;/key&gt; &lt;value attribute="content_type"&gt;Press releases&lt;/value&gt; &lt;/mapping&gt; &lt;mapping&gt; &lt;key&gt;42062&lt;/key&gt; &lt;value attribute="content_type"&gt;Press releases&lt;/value&gt; &lt;/mapping&gt; &lt;/mappings&gt; </code></pre> <p>I get the result</p> <pre><code>&lt;reductions&gt; &lt;reduction&gt; &lt;group&gt;Info Page&lt;/group&gt; &lt;key&gt;6718&lt;/key&gt; &lt;/reduction&gt; &lt;reduction&gt; &lt;group&gt;Press releases&lt;/group&gt; &lt;key&gt;35905&lt;/key&gt; &lt;key&gt;36941&lt;/key&gt; &lt;key&gt;24920&lt;/key&gt; &lt;key&gt;40244&lt;/key&gt; &lt;key&gt;36639&lt;/key&gt; &lt;key&gt;1861&lt;/key&gt; &lt;key&gt;2280&lt;/key&gt; &lt;key&gt;42062&lt;/key&gt; &lt;/reduction&gt; &lt;/reductions&gt; </code></pre> <p>which is correct as far as I understand your requirements.</p>
 

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