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    <p>Try this XSLT</p> <pre><code>&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="Pos" match="Positionen" use="ID" /&gt; &lt;!-- Match Positionen elements normally --&gt; &lt;xsl:template match="Positionen"&gt; &lt;xsl:copy&gt; &lt;xsl:apply-templates select="@*|node()"/&gt; &lt;Path&gt; &lt;!-- Get parent path --&gt; &lt;xsl:apply-templates select="key('Pos', Parent)" mode="parent" /&gt; &lt;!-- End of path --&gt; &lt;xsl:value-of select="ID" /&gt; &lt;/Path&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;!-- Template used to recursively match parents --&gt; &lt;xsl:template match="Positionen" mode="parent"&gt; &lt;xsl:apply-templates select="key('Pos', Parent)" mode="parent" /&gt; &lt;xsl:value-of select="concat(ID, '/')" /&gt; &lt;/xsl:template&gt; &lt;xsl:template match="@*|node()"&gt; &lt;xsl:copy&gt; &lt;xsl:apply-templates select="@*|node()"/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>This starts by matching the <strong>Positionen</strong> elements normally, and then recursively matches the parent elements based on the <strong>Parent</strong> value. Note it also makes use of an <strong>xsl:key</strong> to look-up the element by <strong>ID</strong> much quicker.</p> <p>When applied to your sample XML, the following is output:</p> <pre><code>&lt;Positions&gt; &lt;Positionen&gt; &lt;ID&gt;1&lt;/ID&gt; &lt;Parent/&gt; &lt;Path&gt;1&lt;/Path&gt; &lt;/Positionen&gt; &lt;Positionen&gt; &lt;ID&gt;2&lt;/ID&gt; &lt;Parent&gt;1&lt;/Parent&gt; &lt;Path&gt;1/2&lt;/Path&gt; &lt;/Positionen&gt; &lt;Positionen&gt; &lt;ID&gt;3&lt;/ID&gt; &lt;Parent&gt;1&lt;/Parent&gt; &lt;Path&gt;1/3&lt;/Path&gt; &lt;/Positionen&gt; &lt;Positionen&gt; &lt;ID&gt;4&lt;/ID&gt; &lt;Parent&gt;2&lt;/Parent&gt; &lt;Path&gt;1/2/4&lt;/Path&gt; &lt;/Positionen&gt; &lt;Positionen&gt; &lt;ID&gt;5&lt;/ID&gt; &lt;Parent&gt;4&lt;/Parent&gt; &lt;Path&gt;1/2/4/5&lt;/Path&gt; &lt;/Positionen&gt; &lt;Positionen&gt; &lt;ID&gt;6&lt;/ID&gt; &lt;Parent&gt;2&lt;/Parent&gt; &lt;Path&gt;1/2/6&lt;/Path&gt; &lt;/Positionen&gt; &lt;/Positions&gt; </code></pre>
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    1. POBuild a "path" with XSLT Recursion
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    1. USTim C
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    1. COThis is great. Thanks a lot!
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    2. CO@LStrike: TimC's solution is good but not too-efficient (O(N^2)). Do have a look at my answer for an O(N*log(N)) solution, which is even O(N) if it is acceptable that the `Positionen` elements in the output aren't in the same order as in the source XML document.
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      1. USDimitre Novatchev
 

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