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    copied!<p>As requested, here a stylesheet that works as follows:</p> <ul> <li>merges nodes for which at least an <strong>EMail</strong> is matching</li> <li>during merge, <strong>FirstName</strong> and <strong>SecondName</strong> are copied from the first node always</li> <li>nodes with no matching <strong>EMail</strong> are copied as is</li> <li>nodes without <strong>EMail</strong> nodes are copied as is</li> </ul> <hr> <p>[XSLT 1.0]</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output indent="yes"/&gt; &lt;xsl:key name="k_ContactsByEmail" match="CONTACTS/CONTACT" use="EMail"/&gt; &lt;xsl:template match="CONTACTS"&gt; &lt;xsl:copy&gt; &lt;xsl:apply-templates select="CONTACT[generate-id()= generate-id(key('k_ContactsByEmail',EMail)[1])] | CONTACT[not(EMail)]"/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;xsl:template match="CONTACT"&gt; &lt;xsl:copy&gt; &lt;xsl:copy-of select="*"/&gt; &lt;xsl:copy-of select=" key('k_ContactsByEmail', EMail)/* [not(.=current()/*)] [not(self::FirstName or self::LastName or self::Customer-ID)]"/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>When applied on the XML input provided in the question, it produces:</p> <pre><code>&lt;CONTACTS&gt; &lt;CONTACT&gt; &lt;Customer-ID&gt;Cus-ID3&lt;/Customer-ID&gt; &lt;FirstName&gt;Arnaaud&lt;/FirstName&gt; &lt;LastName&gt;Forestier&lt;/LastName&gt; &lt;EMail&gt;Arnaaud_Forestier201111@yahoo.fr&lt;/EMail&gt; &lt;EMail&gt;Arnaaud_Forestier201111@gmail.com&lt;/EMail&gt; &lt;/CONTACT&gt; &lt;CONTACT&gt; &lt;Customer-ID&gt;Cus-ID7&lt;/Customer-ID&gt; &lt;FirstName&gt;Aana&lt;/FirstName&gt; &lt;LastName&gt;Edwards&lt;/LastName&gt; &lt;EMail&gt;Aana.edwards@gmail.com&lt;/EMail&gt; &lt;/CONTACT&gt; &lt;CONTACT&gt; &lt;Customer-ID&gt;Cus-ID9&lt;/Customer-ID&gt; &lt;FirstName&gt;Aana_Edwards&lt;/FirstName&gt; &lt;LastName&gt;Edwards&lt;/LastName&gt; &lt;EMail&gt;Aana.edwards@yahoo.com&lt;/EMail&gt; &lt;/CONTACT&gt; &lt;CONTACT&gt; &lt;Customer-ID&gt;Cus-ID11&lt;/Customer-ID&gt; &lt;FirstName&gt;Lina&lt;/FirstName&gt; &lt;LastName&gt;Joseph&lt;/LastName&gt; &lt;EMail&gt;Lina.Joseph@aol.com&lt;/EMail&gt; &lt;/CONTACT&gt; &lt;CONTACT&gt; &lt;Customer-ID&gt;Cus-ID13&lt;/Customer-ID&gt; &lt;FirstName&gt;SandfordFrankie&lt;/FirstName&gt; &lt;LastName&gt;Frankie Sandford&lt;/LastName&gt; &lt;EMail&gt;Sandford1233@yahoo.com&lt;/EMail&gt; &lt;URL&gt;http://www.facebook.com/profile.php?id=122112487211054&lt;/URL&gt; &lt;EMail&gt;Sandford.frankie@gmail.com&lt;/EMail&gt; &lt;/CONTACT&gt; &lt;/CONTACTS&gt; </code></pre>
 

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