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    <p><strong>It almost drove me mad, but I finished it. Took me almost 2 hours.</strong></p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output method="xml" indent="yes"/&gt; &lt;xsl:strip-space elements="*"/&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:template match="list[not(preceding-sibling::*[1][self::list])]"&gt; &lt;ol&gt; &lt;xsl:variable name="selfId" select="generate-id()"/&gt; &lt;xsl:call-template name="recurseItems"/&gt; &lt;xsl:apply-templates select=" following-sibling::list [@level = 1 or not(@level)] [preceding-sibling::*[1][self::list]] [$selfId = generate-id( preceding-sibling::list[not(preceding-sibling::*[1][self::list])][1] ) ] [not(position() = 1)] " mode="recurse"/&gt; &lt;/ol&gt; &lt;/xsl:template&gt; &lt;xsl:template name="recurseItems"&gt; &lt;xsl:param name="nodes" select="."/&gt; &lt;xsl:variable name="nextStep" select="$nodes/following-sibling::*[1][self::list]"/&gt; &lt;xsl:choose&gt; &lt;xsl:when test="$nodes/@level and ($nodes/@level &amp;lt; $nextStep/@level)"&gt; &lt;li&gt; &lt;xsl:value-of select="$nodes"/&gt; &lt;ol&gt; &lt;xsl:call-template name="recurseItems"&gt; &lt;xsl:with-param name="nodes" select="$nextStep"/&gt; &lt;/xsl:call-template&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/xsl:when&gt; &lt;xsl:when test="$nodes/@level and ($nodes/@level &gt; $nextStep/@level)"&gt; &lt;xsl:apply-templates select="$nodes" mode="create"/&gt; &lt;/xsl:when&gt; &lt;xsl:when test="$nextStep"&gt; &lt;xsl:apply-templates select="$nodes" mode="create"/&gt; &lt;xsl:call-template name="recurseItems"&gt; &lt;xsl:with-param name="nodes" select="$nextStep"/&gt; &lt;/xsl:call-template&gt; &lt;/xsl:when&gt; &lt;xsl:when test="not($nextStep)"&gt; &lt;xsl:apply-templates select="$nodes" mode="create"/&gt; &lt;/xsl:when&gt; &lt;/xsl:choose&gt; &lt;/xsl:template&gt; &lt;xsl:template match="list" mode="recurse"&gt; &lt;xsl:call-template name="recurseItems"/&gt; &lt;/xsl:template&gt; &lt;xsl:template match="list" mode="create"&gt; &lt;li&gt; &lt;xsl:value-of select="."/&gt; &lt;/li&gt; &lt;/xsl:template&gt; &lt;xsl:template match="list"/&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p><strong>Applied to a slightly more complicated document:</strong></p> <pre><code>&lt;root&gt; &lt;h1&gt;text&lt;/h1&gt; &lt;list level="1"&gt;1.1&lt;/list&gt; &lt;list level="1"&gt;1.2&lt;/list&gt; &lt;list level="2"&gt;1.2.1&lt;/list&gt; &lt;list level="2"&gt;1.2.2&lt;/list&gt; &lt;list level="3"&gt;1.2.2.1&lt;/list&gt; &lt;list level="1"&gt;1.3&lt;/list&gt; &lt;p&gt;text&lt;/p&gt; &lt;list&gt;2.1&lt;/list&gt; &lt;list&gt;2.2&lt;/list&gt; &lt;h2&gt;text&lt;/h2&gt; &lt;h1&gt;text&lt;/h1&gt; &lt;list level="1"&gt;3.1&lt;/list&gt; &lt;list level="1"&gt;3.2&lt;/list&gt; &lt;list level="2"&gt;3.2.1&lt;/list&gt; &lt;list level="2"&gt;3.2.2&lt;/list&gt; &lt;list level="3"&gt;3.2.2.1&lt;/list&gt; &lt;list level="1"&gt;3.3&lt;/list&gt; &lt;list level="2"&gt;3.3.1&lt;/list&gt; &lt;list level="2"&gt;3.3.2&lt;/list&gt; &lt;p&gt;text&lt;/p&gt; &lt;/root&gt; </code></pre> <p><strong>It produces this result:</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;root&gt; &lt;h1&gt;text&lt;/h1&gt; &lt;ol&gt; &lt;li&gt;1.1&lt;/li&gt; &lt;li&gt;1.2 &lt;ol&gt; &lt;li&gt;1.2.1&lt;/li&gt; &lt;li&gt;1.2.2 &lt;ol&gt; &lt;li&gt;1.2.2.1&lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;li&gt;1.3&lt;/li&gt; &lt;/ol&gt; &lt;p&gt;text&lt;/p&gt; &lt;ol&gt; &lt;li&gt;2.1&lt;/li&gt; &lt;li&gt;2.2&lt;/li&gt; &lt;/ol&gt; &lt;h2&gt;text&lt;/h2&gt; &lt;h1&gt;text&lt;/h1&gt; &lt;ol&gt; &lt;li&gt;3.1&lt;/li&gt; &lt;li&gt;3.2 &lt;ol&gt; &lt;li&gt;3.2.1&lt;/li&gt; &lt;li&gt;3.2.2 &lt;ol&gt; &lt;li&gt;3.2.2.1&lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;li&gt;3.3 &lt;ol&gt; &lt;li&gt;3.3.1&lt;/li&gt; &lt;li&gt;3.3.2&lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/ol&gt; &lt;p&gt;text&lt;/p&gt; &lt;/root&gt; </code></pre> <p><strong>Applied to your sample it also produces the correct result:</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;root&gt; &lt;h1&gt;text&lt;/h1&gt; &lt;ol&gt; &lt;li&gt;num1&lt;/li&gt; &lt;li&gt;num2 &lt;ol&gt; &lt;li&gt;sub-num1&lt;/li&gt; &lt;li&gt;sub-num2 &lt;ol&gt; &lt;li&gt;sub-sub-num1&lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;li&gt;num3&lt;/li&gt; &lt;/ol&gt; &lt;p&gt;text&lt;/p&gt; &lt;ol&gt; &lt;li&gt;num1&lt;/li&gt; &lt;li&gt;num2&lt;/li&gt; &lt;/ol&gt; &lt;h2&gt;text&lt;/h2&gt; &lt;/root&gt; </code></pre>
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