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POXPath 1.0 closest preceding and/or ancestor node with an attribute in a XML Tree
 

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    <p>Here are three XML-trees</p> <p>(1)</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;content&gt; &lt;section id="1"&gt; &lt;section id="2"/&gt; &lt;section id="3"/&gt; &lt;section id="9"/&gt; &lt;/section&gt; &lt;section id="4"&gt; &lt;section id="5"&gt; &lt;section&gt; &lt;bookmark/&gt; &lt;!-- here's the bookmark--&gt; &lt;section id="6"&gt; &lt;section id="7"&gt; &lt;section id="8"/&gt; &lt;/section&gt; &lt;/section&gt; &lt;/section&gt; &lt;/section&gt; &lt;/section&gt; &lt;/content&gt; </code></pre> <p>(2)</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;content&gt; &lt;section id="1"/&gt; &lt;section id="2"&gt; &lt;section id="9"&gt; &lt;section id="10"&gt; &lt;section id="11"/&gt; &lt;/section&gt; &lt;/section&gt; &lt;section&gt; &lt;section id="4"&gt; &lt;section id="5"/&gt; &lt;/section&gt; &lt;/section&gt; &lt;section/&gt; &lt;bookmark/&gt; &lt;!-- here's the bookmark--&gt; &lt;section id="6"&gt; &lt;section id="7"&gt; &lt;section id="8"/&gt; &lt;/section&gt; &lt;/section&gt; &lt;/section&gt; &lt;/content&gt; </code></pre> <p>The desired result is in both cases the id <strong>5</strong>.</p> <p>With XSLT 1.0 and XPath 1.0 I can either get the ancestor from (1)</p> <pre><code>&lt;xsl:value-of select="//bookmark/ancestor::*[@id][1]/@id"/&gt; </code></pre> <p>or the preceding node from (2)</p> <pre><code>&lt;xsl:value-of select="//bookmark/preceding::*[@id][1]/@id"/&gt; </code></pre> <p>How do I get the <strong>nearest</strong> ancestor <strong>or</strong> preceding node with an id from my bookmark?<br> I need a single xsl:value-of which matches both cases. Thanks.</p> <p><strong>EDIT:</strong></p> <p>The solution should also cover this structure. Desired id is still <strong>5</strong>.</p> <p>(3)</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;content&gt; &lt;section id="1"&gt; &lt;section id="2"/&gt; &lt;section id="3"/&gt; &lt;section id="9"/&gt; &lt;/section&gt; &lt;section id="4"&gt; &lt;section&gt; &lt;section id="10"/&gt; &lt;section id="5"/&gt; &lt;section&gt; &lt;bookmark/&gt; &lt;!-- here's the bookmark--&gt; &lt;section id="6"&gt; &lt;section id="7"&gt; &lt;section id="8"/&gt; &lt;/section&gt; &lt;/section&gt; &lt;/section&gt; &lt;/section&gt; &lt;/section&gt; &lt;/content&gt; </code></pre>
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    1. COPicture which shows all xpath axes: [pic](http://nwalsh.com/docs/tutorials/xsl/xsl/graphics/axes.gif)
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    2. COGood question, +1. See my answer for a one-liner XPath expression that selects exactly the wanted attribute node in all three cases. :)
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      1. USDimitre Novatchev
 

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