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    copied!<p>Sample XML:</p> <pre><code>&lt;root&gt; &lt;header/&gt; &lt;item&gt;1&lt;/item&gt; &lt;item&gt;2&lt;/item&gt; &lt;item&gt;3&lt;/item&gt; &lt;header/&gt; &lt;item&gt;5&lt;/item&gt; &lt;item&gt;6&lt;/item&gt; &lt;item&gt;7&lt;/item&gt; &lt;/root&gt; </code></pre> <p>XSLT using grouping:</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:key name="k" match="item" use="count(preceding-sibling::header)"/&gt; &lt;xsl:template match="/"&gt; &lt;root2&gt; &lt;xsl:apply-templates select="root/item[generate-id(.) = generate-id(key('k', count(preceding-sibling::header)))]" mode="a"/&gt; &lt;/root2&gt; &lt;/xsl:template&gt; &lt;xsl:template match="item" mode="a"&gt; &lt;header2&gt; &lt;xsl:apply-templates select="key('k', count(preceding-sibling::header))"/&gt; &lt;/header2&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>Or simple particular XSLT:</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:template match="/"&gt; &lt;root2&gt; &lt;header2&gt; &lt;xsl:apply-templates select="root/item[count(preceding-sibling::header) = 1]"/&gt; &lt;/header2&gt; &lt;header2&gt; &lt;xsl:apply-templates select="root/item[count(preceding-sibling::header) = 2]"/&gt; &lt;/header2&gt; &lt;/root2&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>Both produce the same output:</p> <pre><code>&lt;root2&gt; &lt;header2&gt; &lt;item&gt;1&lt;/item&gt; &lt;item&gt;2&lt;/item&gt; &lt;item&gt;3&lt;/item&gt; &lt;/header2&gt; &lt;header2&gt; &lt;item&gt;5&lt;/item&gt; &lt;item&gt;6&lt;/item&gt; &lt;item&gt;7&lt;/item&gt; &lt;/header2&gt; &lt;/root2&gt; </code></pre>
 

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