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    copied!<p>Sounds like you have to group the instance belonging to one course by year. This could be done with a key like the following one:</p> <pre><code>&lt;xsl:key name="kCourseInstaneByYears" match="instance" use="concat(ancestor::course/uuid, '|' , year)"/&gt; </code></pre> <p>This assume that the course/uuid is unique for courses.</p> <p>With this key you can try something like this (surly not complete but should show the idea).</p> <pre><code>?xml version="1.0" encoding="utf-8"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output method="xml" indent="yes"/&gt; &lt;xsl:key name="kCourseInstaneByYears" match="instance" use="concat(ancestor::course/uuid, '|' , year)"/&gt; &lt;xsl:template match="/*"&gt; &lt;html&gt; &lt;body&gt; &lt;xsl:apply-templates select="//course" /&gt; &lt;/body&gt; &lt;/html&gt; &lt;/xsl:template&gt; &lt;xsl:template match="course"&gt; &lt;xsl:variable name ="courseID" select="uuid" /&gt; &lt;h1&gt; &lt;xsl:value-of select="coursetitle" /&gt; &lt;/h1&gt; &lt;xsl:for-each select="descendant::instance[generate-id() = generate-id(key('kCourseInstaneByYears', concat($courseID, '|' , year))[1])]" &gt; &lt;xsl:sort select="year"/&gt; &lt;xsl:variable name="year" select="year" /&gt; &lt;h2&gt; &lt;xsl:value-of select="$year"/&gt; &lt;/h2&gt; &lt;table&gt; &lt;xsl:apply-templates select="key('kCourseInstaneByYears', concat($courseID, '|' , $year))" /&gt; &lt;/table&gt; &lt;/xsl:for-each&gt; &lt;/xsl:template&gt; &lt;xsl:template match="instance" &gt; &lt;tr&gt; &lt;td&gt; &lt;xsl:value-of select="uuid"/&gt; &lt;/td&gt; &lt;td&gt; &lt;xsl:value-of select="instancecode"/&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>Which will generate the following output:</p> <pre><code>&lt;html&gt; &lt;body&gt; &lt;h1&gt;Being better at XSLT&lt;/h1&gt; &lt;h2&gt;2013&lt;/h2&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt;1054EDE3F28D9873&lt;/td&gt; &lt;td&gt;MPW1F&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;D9FC4501-F504-B560-FB8DFC3EF41C0E1F&lt;/td&gt; &lt;td&gt;MPO1F&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;D9FC5017-0789-16A0-C8BBD0F0BE016E6F&lt;/td&gt; &lt;td&gt;MPW2F&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;D9FC4963-A684-565A-5AA282A7CEC7B4CC&lt;/td&gt; &lt;td&gt;MPO2F&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;h1&gt;Being better at XML&lt;/h1&gt; &lt;h2&gt;2013&lt;/h2&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt;D9FC5017-0789-16A0-C8BBD0F0BE016E6F&lt;/td&gt; &lt;td&gt;MPW2F&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;D9FC4963-A684-565A-5AA282A7CEC7B4CC&lt;/td&gt; &lt;td&gt;MPO2F&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;h2&gt;2014&lt;/h2&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt;1054EDE3F28D9873&lt;/td&gt; &lt;td&gt;MPW1F&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;D9FC4501-F504-B560-FB8DFC3EF41C0E1F&lt;/td&gt; &lt;td&gt;MPO1F&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
 

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