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    <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"&gt; &lt;xsl:output indent="yes"/&gt; &lt;xsl:key name="stat-key" match="/Data/Statistic" use="Type"/&gt; &lt;xsl:template match="/"&gt; &lt;Data&gt; &lt;xsl:apply-templates select="/Data/Statistic[generate-id()=generate-id(key('stat-key',Type)[1])]"&gt; &lt;xsl:sort select="Type"/&gt; &lt;/xsl:apply-templates&gt; &lt;/Data&gt; &lt;/xsl:template&gt; &lt;xsl:template match="Statistic"&gt; &lt;xsl:copy&gt; &lt;xsl:copy-of select="Title|Type"/&gt; &lt;count&gt; &lt;Case&gt; &lt;xsl:value-of select="key('stat-key', Type)[Key='Cases']/Value"/&gt; &lt;/Case&gt; &lt;Percentage&gt; &lt;xsl:value-of select="key('stat-key', Type)[Key='Percentage']/Value"/&gt; &lt;/Percentage&gt; &lt;/count&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>It picks the <code>Title</code> of the first <code>Statistic</code> for each <code>Type</code>-group.</p> <p><strong>Output</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;Data&gt; &lt;Statistic&gt; &lt;Title&gt;Total Values&lt;/Title&gt; &lt;Type&gt;Type A&lt;/Type&gt; &lt;count&gt; &lt;Case&gt;3&lt;/Case&gt; &lt;Percentage&gt;75.0%&lt;/Percentage&gt; &lt;/count&gt; &lt;/Statistic&gt; &lt;Statistic&gt; &lt;Title&gt;Total Values&lt;/Title&gt; &lt;Type&gt;Type B&lt;/Type&gt; &lt;count&gt; &lt;Case&gt;1&lt;/Case&gt; &lt;Percentage&gt;25.0%&lt;/Percentage&gt; &lt;/count&gt; &lt;/Statistic&gt; &lt;/Data&gt; </code></pre>
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