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POxsl:sort an XML file using multiple elements
 

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    <p>I'm trying to sort a bunch of records in an XML file. The trick is that I need to sort using different elements for different nodes. To give a simplest example, I want to do this: given an xml file </p> <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt; &lt;buddies&gt; &lt;person&gt; &lt;nick&gt;Jim&lt;/nick&gt; &lt;last&gt;Zulkin&lt;/last&gt; &lt;/person&gt; &lt;person&gt; &lt;first&gt;Joe&lt;/first&gt; &lt;last&gt;Bumpkin&lt;/last&gt; &lt;/person&gt; &lt;person&gt; &lt;nick&gt;Pumpkin&lt;/nick&gt; &lt;/person&gt; &lt;person&gt; &lt;nick&gt;Andy&lt;/nick&gt; &lt;/person&gt; &lt;/buddies&gt; </code></pre> <p>I want to convert it to</p> <pre><code>Andy Joe Bumpkin Pumpkin Jim Zulkin </code></pre> <p>That is, a person may be listed by any subset of the first name, last name and a nick. The sorting key is the last name if it's present, otherwise it's the nickname if it's present and a firstname otherwise. </p> <p>I'm having difficulties here since using of variables as xsl:sort keys is <a href="https://stackoverflow.com/questions/2328896/using-variables-in-xslsort-select">apparently not allowed</a>.</p> <p>My current best shot is to have a two-step transformation: Add a special tag to each record using this stylesheet</p> <pre><code>&lt;?xml version="1.0" encoding="ISO-8859-1"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output omit-xml-declaration="no" indent="yes"/&gt; &lt;!-- *** convert each person record into a person2 record w/ the sorting key *** --&gt; &lt;xsl:template match="/buddies"&gt; &lt;buddies&gt; &lt;xsl:for-each select="person"&gt; &lt;person2&gt; &lt;xsl:copy-of select="*"/&gt; &lt;!-- add the sort-by tag --&gt; &lt;sort-by&gt; &lt;xsl:choose&gt; &lt;xsl:when test="last"&gt; &lt;xsl:value-of select="last"/&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;xsl:choose&gt; &lt;xsl:when test="nick"&gt; &lt;xsl:value-of select="nick"/&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;xsl:value-of select="first"/&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/sort-by&gt; &lt;/person2&gt; &lt;/xsl:for-each&gt; &lt;/buddies&gt; </code></pre> <p></p> <p></p> <p>And then sort the resulting xml </p> <pre><code>&lt;?xml version="1.0" encoding="ISO-8859-1"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:template match="/buddies"&gt; &lt;xsl:apply-templates&gt; &lt;xsl:sort select="sort-by"/&gt; &lt;/xsl:apply-templates&gt; &lt;/xsl:template&gt; &lt;xsl:template match="person2"&gt; &lt;xsl:value-of select="first"/&gt; &lt;xsl:value-of select="nick"/&gt; &lt;xsl:value-of select="last"/&gt;&lt;xsl:text&gt; &lt;/xsl:text&gt; &lt;/xsl:template&gt; </code></pre> <p></p> <p>While this two-step transform works, I'm wondering if there is more elegant way of doing it in just one go? </p>
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