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    <p>Here is an XSLT 2.0 stylesheet:</p> <pre><code>&lt;xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:key name="dist" match="childelement[not(@xml:type = 'base')]" use="concat(@xml:type, '|', seg1, '|', seg2)"/&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:template match="childelement[not(@xml:type = 'base')][seg3 &amp;lt; max(key('dist', concat(@xml:type, '|', seg1, '|', seg2))/seg3)]"/&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>When applied with Saxon 9 to your input sample (with a <code>root</code> element added) the output is</p> <pre><code>&lt;root&gt; &lt;element&gt; &lt;childelement xml:type="base" id="645"&gt; &lt;seg1&gt;a&lt;/seg1&gt; &lt;seg2&gt;A&lt;/seg2&gt; &lt;seg3&gt;0&lt;/seg3&gt; &lt;/childelement&gt; &lt;childelement xml:type="level1" id="646"&gt; &lt;seg1&gt;a&lt;/seg1&gt; &lt;seg2&gt;B&lt;/seg2&gt; &lt;seg3&gt;1&lt;/seg3&gt; &lt;/childelement&gt; &lt;childelement xml:type="level2" id="656"&gt; &lt;seg1&gt;a&lt;/seg1&gt; &lt;seg2&gt;C&lt;/seg2&gt; &lt;seg3&gt;0&lt;/seg3&gt; &lt;/childelement&gt; &lt;/element&gt; &lt;element&gt; &lt;childelement xml:type="base" id="647"&gt; &lt;seg1&gt;a&lt;/seg1&gt; &lt;seg2&gt;A&lt;/seg2&gt; &lt;seg3&gt;0&lt;/seg3&gt; &lt;/childelement&gt; &lt;childelement xml:type="level2" id="649"&gt; &lt;seg1&gt;a&lt;/seg1&gt; &lt;seg2&gt;D&lt;/seg2&gt; &lt;seg3&gt;0&lt;/seg3&gt; &lt;/childelement&gt; &lt;/element&gt; &lt;/root&gt; </code></pre> <p>If you need to use an XSLT 1.0 processor then</p> <pre><code>&lt;xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:key name="dist" match="childelement[not(@xml:type = 'base')]" use="concat(@xml:type, '|', seg1, '|', seg2)"/&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:template match="childelement[not(@xml:type = 'base')]"&gt; &lt;xsl:variable name="this" select="."/&gt; &lt;xsl:for-each select="key('dist', concat(@xml:type, '|', seg1, '|', seg2))"&gt; &lt;xsl:sort select="seg3" data-type="number" order="descending"/&gt; &lt;xsl:if test="position() = 1 and generate-id() = generate-id($this)"&gt; &lt;xsl:copy-of select="."/&gt; &lt;/xsl:if&gt; &lt;/xsl:for-each&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>is my version of translation the XSLT 2.0 approach into XSLT 1.0.</p>
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    1. PORemove duplicates in xml based on attributes values and several nodes' innertext
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    1. USMartin Honnen
    1. USMartin Honnen
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    1. COThanks Martin for taking the time. I'm trying to use it with a c# console application but get the error 'max()' is an unknown XSLT function.
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    2. COIf you want to use XSLT 2.0 with C# you have the option of using the .NET version of Saxon 9 or XmlPrime. Microsoft's XslCompiledTransform does not support XSLT 2.0.
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    3. CO@azazaz, I have edited the answer to provide an XSLT 1.0 solution
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