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    <p><strong>Use</strong>:</p> <pre><code>/*/*/Item [SerialNumber = following-sibling::Item/SerialNumber and not(SerialNumber = preceding-sibling::Item/SerialNumber) ] </code></pre> <p>This selects just one <code>Item</code> element for any group of <code>Item</code> elements that have a <code>SerialNumber</code> child with the same string value.</p> <p><strong>XSLT - based verification</strong>:</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output omit-xml-declaration="yes" indent="yes"/&gt; &lt;xsl:strip-space elements="*"/&gt; &lt;xsl:template match="/"&gt; &lt;xsl:copy-of select= "/*/*/Item [SerialNumber = following-sibling::Item/SerialNumber and not(SerialNumber = preceding-sibling::Item/SerialNumber) ]"/&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p><strong>When this transformation is applied on this XML document</strong> (based on the provided one, but made more interesting):</p> <pre><code>&lt;Inventory&gt; &lt;Items&gt; &lt;Item&gt; &lt;SerialNumber&gt;1111&lt;/SerialNumber&gt; &lt;/Item&gt; &lt;Item&gt; &lt;SerialNumber&gt;2222&lt;/SerialNumber&gt; &lt;/Item&gt; &lt;Item&gt; &lt;SerialNumber&gt;2222&lt;/SerialNumber&gt; &lt;/Item&gt; &lt;Item&gt; &lt;SerialNumber&gt;2222&lt;/SerialNumber&gt; &lt;/Item&gt; &lt;Item&gt; &lt;SerialNumber&gt;1111&lt;/SerialNumber&gt; &lt;/Item&gt; &lt;Item&gt; &lt;SerialNumber&gt;1111&lt;/SerialNumber&gt; &lt;/Item&gt; &lt;Item&gt; &lt;SerialNumber&gt;3333&lt;/SerialNumber&gt; &lt;/Item&gt; &lt;/Items&gt; &lt;/Inventory&gt; </code></pre> <p><strong>the transformation evaluates the XPath expression and copies the selected nodes to the output:</strong></p> <pre><code>&lt;Item&gt; &lt;SerialNumber&gt;1111&lt;/SerialNumber&gt; &lt;/Item&gt; &lt;Item&gt; &lt;SerialNumber&gt;2222&lt;/SerialNumber&gt; &lt;/Item&gt; </code></pre> <p><strong>Finally, if you want to get just the <code>SerialNumber</code> duplicate values, use</strong>:</p> <pre><code> /*/*/Item [SerialNumber = following-sibling::Item/SerialNumber and not(SerialNumber = preceding-sibling::Item/SerialNumber) ] /SerialNumber/text() </code></pre>
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    1. POHow do I identify duplicate nodes in XPath 1.0 using an XPathNavigator to evaluate?
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    1. USDimitre Novatchev
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    1. POHow do I identify duplicate nodes in XPath 1.0 using an XPathNavigator to evaluate?
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    1. COExcellent answer @Dimitre. Does the initial /*/*/ represent the Inventory and Items nodes?
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      1. USGavin Sutherland
    2. CO@GavinSutherland: Yes, because we know the structure of the XML document, we know that only/exactly these elements can be selected by `/*/*` -- this is a convenient shortcut and is slightly more efficient that an exact name test.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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