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POXSL: selecting data from a node based on the value of a variable
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  1. POXSL: selecting data from a node based on the value of a variable
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    copied!<p>I'm working on a minor project learning XSL, and I've run across a problem...</p> <p>I have a Docbook file with a series of entires for people categorized by Department. Occasionally, however, I will have a person who works in a minor group as well as his own. To avoid duplication of data, I specified that a person node either contains the data in their node, or an xref node that links to their main node. When I iterate over all people in a group, I need to check whether the node is a linked node or a data node and adjust my variables accordingly.</p> <p>Here's the choose code</p> <pre><code>&lt;xsl:choose&gt; &lt;xsl:when test="xref"&gt; &lt;xsl:variable name="TAG_ID" select="xref/@linkend" /&gt; &lt;xsl:variable name="NAME" select="//*[@id='$TAG_ID']/para[@id='who']" /&gt; &lt;xsl:variable name="EMAIL" select="//*[@id='$TAG_ID']/para[@id='who']/ulink/@url" /&gt; &lt;xsl:variable name="IMAGE" select="//*[@id='$TAG_ID']/para[@id='image']" /&gt; &lt;xsl:variable name="MEET" select="//*[@id='$TAG_ID']/para[@id='meet']" /&gt; &lt;xsl:call-template name="output_person" /&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;xsl:variable name="NAME" select="para[@id ='who']" /&gt; &lt;xsl:variable name="EMAIL" select="para[@id='who']/ulink/@url" /&gt; &lt;xsl:variable name="IMAGE" select="para [@id='image']" /&gt; &lt;xsl:variable name="MEET" select="para [@id='meet']" /&gt; &lt;xsl:call-template name="output_person" /&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; </code></pre> <p>However, when I try to run this I get the following errors...</p> <pre><code>runtime error: file team.xsl line 92 element img Variable 'IMAGE' has not been declared. xmlXPathCompiledEval: evaluation failed </code></pre> <p>After some looking on the internet, I have simultaneously seen code that accomplishes this and people saying its impossible.</p> <p>So my question is twofold...</p> <p>Can I select a specific node based on an variable?</p> <p>and if not, can this even be done? </p>
 

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