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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"&gt; &lt;xsl:output omit-xml-declaration="yes" indent="yes"/&gt; &lt;xsl:template match="/"&gt; &lt;xsl:call-template name="product"&gt; &lt;xsl:with-param name="pArgs" select="//zero"/&gt; &lt;/xsl:call-template&gt; &lt;/xsl:template&gt; &lt;xsl:template name="product"&gt; &lt;xsl:param name="pAccum" select="1"/&gt; &lt;xsl:param name="pArgs" select="/.."/&gt; &lt;xsl:choose&gt; &lt;xsl:when test="not($pArgs)"&gt; &lt;xsl:value-of select="$pAccum"/&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;xsl:call-template name="product"&gt; &lt;xsl:with-param name="pAccum" select="$pAccum * count($pArgs[1]/ancestor::s)"/&gt; &lt;xsl:with-param name="pArgs" select="$pArgs[position() &gt; 1]"/&gt; &lt;/xsl:call-template&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&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;nat&gt; &lt;s&gt; &lt;s&gt; &lt;zero/&gt; &lt;/s&gt; &lt;/s&gt; &lt;s&gt; &lt;s&gt; &lt;zero/&gt; &lt;/s&gt; &lt;/s&gt; &lt;s&gt; &lt;s&gt; &lt;zero/&gt; &lt;/s&gt; &lt;/s&gt; &lt;/nat&gt; </code></pre> <p><strong>produces the wanted, correct result:</strong></p> <pre><code>8 </code></pre> <p><strong>Explanation</strong>:</p> <p>Primitive recursion with stop condition -- empty argument node-set and an accumulator - parameter for passing the currently accumulated result to the next recursive call.</p>
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    1. USDimitre Novatchev
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    1. CO+1 for correct answer but instead of displaying 8 it should display <s><s><s><s><s><s><s><s><zero/></s></s></s></s></s></s></s></s>. There are 8 <s> and <zero/> to indicate the end.
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    2. COThanks! it works out nicely. I ran your solution through debugger and added in the template to get the correct representation for the answer. See my edit above!
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    3. CO@bili: You are welcome. Yes, I completely ignored this rather strange format. I wasn't aware you wanted an XSLT 2.0 solution -- in such case it is more convenient to use `xsl:finction` . Also, if you are interested in this topic, you might find it interesting reading about FXSL: http://conferences.idealliance.org/extreme/html/2006/Novatchev01/EML2006Novatchev01.html
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      1. USDimitre Novatchev
 

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