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    <p>Without any recursion:</p> <pre><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 method="xml" indent="yes"/&gt; &lt;xsl:template match="/root"&gt; &lt;root&gt; &lt;xsl:apply-templates select="item"/&gt; &lt;/root&gt; &lt;/xsl:template&gt; &lt;xsl:template match="item"&gt; &lt;new-item&gt; &lt;xsl:copy-of select="code"/&gt; &lt;xsl:for-each select="included-code | /root/item[included-code = current()/included-code]/code[. != current()/included-code and . != current()/code]"&gt; &lt;included-code&gt; &lt;xsl:value-of select="."/&gt; &lt;/included-code&gt; &lt;/xsl:for-each&gt; &lt;/new-item&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>It picks any current <code>&lt;included-code&gt;</code>'s, plus for any item with an <code>&lt;included-code&gt;</code> in common, it picks the <code>&lt;code&gt;</code>, if it has not already been included.</p> <p><strong>Output:</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;root&gt; &lt;new-item&gt; &lt;code&gt;AA&lt;/code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;YY&lt;/included-code&gt; &lt;included-code&gt;WW&lt;/included-code&gt; &lt;included-code&gt;BB&lt;/included-code&gt; &lt;included-code&gt;CC&lt;/included-code&gt; &lt;/new-item&gt; &lt;new-item&gt; &lt;code&gt;BB&lt;/code&gt; &lt;included-code&gt;AA&lt;/included-code&gt; &lt;included-code&gt;ZZ&lt;/included-code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;YY&lt;/included-code&gt; &lt;included-code&gt;CC&lt;/included-code&gt; &lt;/new-item&gt; &lt;new-item&gt; &lt;code&gt;CC&lt;/code&gt; &lt;included-code&gt;AA&lt;/included-code&gt; &lt;included-code&gt;BB&lt;/included-code&gt; &lt;included-code&gt;VV&lt;/included-code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;WW&lt;/included-code&gt; &lt;/new-item&gt; &lt;/root&gt; </code></pre>
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    1. USMarkus Jarderot
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    1. COPerfect! Thank you so much. Very elegant solution to this particular problem.
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    2. COThis probably deserves a +1, but I haven't had time to analyze the question well enough to determine the correctness of the answer. Unfortunately the question is not very explicit about the desired transformation.
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    3. CO@LarsH The question seems very abstract to me. I went by the original XSLT-ode, which just picked the `<code>` of any `<item>` that shared any `<included-code>`.
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