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    <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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    1. COit works, thank you. Would you please suggest me the best way to learn XSLT? It seems it's one of the cool technology to deal with XML files and it's really interesting. Thank you once again.
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    2. COUse it a lot, follow Stack Overflow questions [xslt] or [xpath] tagged, read @Michael Key or __OReilly__ books, always answer your doubts by reading W3 Recommendation or obviously asking here :)
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    3. COGreat information. Thank you once again :)
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