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    copied!<p><strong>This XSLT 1.0 stylesheet ...</strong></p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:esl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="xsl esl" &gt; &lt;xsl:output indent="yes" omit-xml-declaration="yes" /&gt; &lt;xsl:strip-space elements="*" /&gt; &lt;xsl:key name="kByName" match="*" use="local-name()" /&gt; &lt;xsl:variable name="DefaultNodes"&gt; &lt;DefaultNodes&gt; &lt;a&gt;-1&lt;/a&gt; &lt;b&gt;-1&lt;/b&gt; &lt;c&gt;-1&lt;/c&gt; &lt;d&gt;-1&lt;/d&gt; &lt;/DefaultNodes&gt; &lt;/xsl:variable&gt; &lt;xsl:template match="Message"&gt; &lt;MsgHead&gt; &lt;Document&gt; &lt;xsl:copy&gt; &lt;xsl:variable name="union"&gt; &lt;xsl:apply-templates select="* | esl:node-set($DefaultNodes)/DefaultNodes/*[local-name()]"/&gt; &lt;/xsl:variable&gt; &lt;xsl:copy-of select="esl:node-set($union)/*[generate-id() = generate-id(key('kByName',local-name())[1])]" /&gt; &lt;/xsl:copy&gt; &lt;/Document&gt; &lt;/MsgHead&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><strong>... when applied to this input document ...</strong></p> <pre><code>&lt;Message&gt; &lt;a&gt;123&lt;/a&gt; &lt;c&gt;456&lt;/c&gt; &lt;d&gt;789&lt;/d&gt; &lt;/Message&gt; </code></pre> <p><strong>... yields ...</strong></p> <pre><code>&lt;MsgHead&gt; &lt;Document&gt; &lt;Message&gt; &lt;a&gt;123&lt;/a&gt; &lt;c&gt;456&lt;/c&gt; &lt;d&gt;789&lt;/d&gt; &lt;b&gt;-1&lt;/b&gt; &lt;/Message&gt; &lt;/Document&gt; &lt;/MsgHead&gt; </code></pre> <p>Note: Change the esl namespace to <code>http://exslt.org/common</code> as required, depending on your XSLT processor.</p>
 

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