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    <p><strong>This transformation</strong>:</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:s="http://www.w3.org/2005/07/scxml" &gt; &lt;xsl:output omit-xml-declaration="yes" indent="yes"/&gt; &lt;xsl:strip-space elements="*"/&gt; &lt;xsl:template match="node()|@*" name="identity"&gt; &lt;xsl:copy&gt; &lt;xsl:apply-templates select="node()|@*"/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;xsl:template match="s:state"&gt; &lt;xsl:variable name="vNum"&gt; &lt;xsl:number level="any" count="s:state"/&gt; &lt;/xsl:variable&gt; &lt;xsl:copy&gt; &lt;xsl:copy-of select="@*"/&gt; &lt;xsl:attribute name="stateId"&gt; &lt;xsl:value-of select="@id"/&gt; &lt;/xsl:attribute&gt; &lt;xsl:attribute name="id"&gt; &lt;xsl:value-of select="$vNum -1"/&gt; &lt;/xsl:attribute&gt; &lt;xsl:apply-templates/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p><strong>when applied on the provided XML document</strong>:</p> <pre><code>&lt;scxml xmlns="http://www.w3.org/2005/07/scxml"&gt; &lt;state id="Compound1"&gt; &lt;state id="Basic1"/&gt; &lt;state id="Basic2"/&gt; &lt;state id="Basic3"/&gt; &lt;/state&gt; &lt;/scxml&gt; </code></pre> <p><strong>produces the wanted, correct output</strong>:</p> <pre><code>&lt;scxml xmlns="http://www.w3.org/2005/07/scxml"&gt; &lt;state stateId="Compound1" id="0"&gt; &lt;state stateId="Basic1" id="1"/&gt; &lt;state stateId="Basic2" id="2"/&gt; &lt;state stateId="Basic3" id="3"/&gt; &lt;/state&gt; &lt;/scxml&gt; </code></pre>
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