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    copied!<p><strong>It can be as simple as this, assuming a <code>BarName</code> precedes its corresponding <code>FooName</code>:</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;Out&gt; &lt;Foos&gt; &lt;xsl:apply-templates select="FooName"/&gt; &lt;/Foos&gt; &lt;Bars&gt; &lt;xsl:apply-templates select="BarName"/&gt; &lt;/Bars&gt; &lt;/Out&gt; &lt;/xsl:template&gt; &lt;xsl:template match="FooName"&gt; &lt;Foo&gt; &lt;Id&gt;&lt;xsl:call-template name="makeFooId"/&gt;&lt;/Id&gt; &lt;Name&gt;&lt;xsl:value-of select="."/&gt;&lt;/Name&gt; &lt;/Foo&gt; &lt;/xsl:template&gt; &lt;xsl:template match="BarName"&gt; &lt;Bar&gt; &lt;Id&gt;&lt;xsl:value-of select="preceding-sibling::BarId[1]"/&gt;&lt;/Id&gt; &lt;Name&gt;&lt;xsl:value-of select="."/&gt;&lt;/Name&gt; &lt;FooId&gt; &lt;xsl:call-template name="makeFooId"&gt; &lt;xsl:with-param name="pFoo" select="following-sibling::FooName[1]"/&gt; &lt;/xsl:call-template&gt; &lt;/FooId&gt; &lt;/Bar&gt; &lt;/xsl:template&gt; &lt;xsl:template name="makeFooId"&gt; &lt;xsl:param name="pFoo" select="."/&gt; &lt;!-- Replace the following line with your id - generating code --&gt; &lt;xsl:text&gt;100&lt;/xsl:text&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p><strong>When this transformation is applied to the provided XML document:</strong></p> <pre><code>&lt;Input&gt; &lt;BarId&gt;123&lt;/BarId&gt; &lt;BarName&gt;myname&lt;/BarName&gt; &lt;FooName&gt;dummy&lt;/FooName&gt; &lt;/Input&gt; </code></pre> <p><strong>the wanted, correct result is produced</strong>:</p> <pre><code>&lt;Out&gt; &lt;Foos&gt; &lt;Foo&gt; &lt;Id&gt;100&lt;/Id&gt; &lt;Name&gt;dummy&lt;/Name&gt; &lt;/Foo&gt; &lt;/Foos&gt; &lt;Bars&gt; &lt;Bar&gt; &lt;Id&gt;123&lt;/Id&gt; &lt;Name&gt;myname&lt;/Name&gt; &lt;FooId&gt;100&lt;/FooId&gt; &lt;/Bar&gt; &lt;/Bars&gt; &lt;/Out&gt; </code></pre>
 

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