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POTesting for preceding-sibling and matching descendant using xsl:key
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  1. POTesting for preceding-sibling and matching descendant using xsl:key
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    copied!<p>I have a problem that I believe I need to use grouping using xsl:key to solve, but I am at a loss as to the correct syntax. For the following XML, when I process each <code>&lt;a/&gt;</code> element I need to test to see if</p> <ol> <li><p>the element has a preceding-sibling <code>&lt;markerStart/&gt;</code> element and a descendant <code>&lt;/markerEnd&gt;</code> element with the same id. </p> <ul> <li>By "preceding-sibling" I mean that there must not be an <code>&lt;a/&gt;</code> between the current element and the <code>&lt;markerStart/&gt;</code> , so the <code>&lt;a/&gt;</code> marked <code>&lt;!-- # 5 --&gt;</code> should return false, while the <code>&lt;a/&gt;</code> marked <code>&lt;!-- # 1 --&gt;</code> and the first <code>&lt;a/&gt;</code> following the element marked <code>&lt;!-- # 2a --&gt;</code> should return true.</li> <li>By "descendant" I mean that there must not be an <code>&lt;a/&gt;</code> descendant before the <code>&lt;markerEnd/&gt;</code> , so the <code>&lt;a/&gt;</code> marked <code>&lt;!-- # 0 --&gt;</code> and the first <code>&lt;a/&gt;</code> following the element marked <code>&lt;!-- # 2b --&gt;</code> should return false.</li> </ul></li> <li><p>OR the element has a descendant <code>&lt;markerStart/&gt;</code> element and a descendant <code>&lt;/markerEnd&gt;</code> element with the same id. </p> <ul> <li>By "descendant" I mean that there must not be an <code>&lt;a/&gt;</code> descendant before the <code>&lt;markerEnd/&gt;</code>. </li> </ul></li> </ol> <p>For the following XML, I would expect the nodes marked with <code>&lt;!-- # 1 --&gt;</code>, <code>&lt;!-- # 2a --&gt;</code>, and <code>&lt;!-- # 4 --&gt;</code> to return true.</p> <pre><code>&lt;root&gt; &lt;a&gt;&lt;!-- # 0 --&gt; &lt;b&gt; &lt;c&gt; &lt;markerStart id="a1"/&gt; &lt;a&gt; &lt;!-- # 1 --&gt; &lt;b&gt; &lt;c&gt; &lt;markeEnd id="a1"/&gt; &lt;/c&gt; &lt;/b&gt; &lt;/a&gt; &lt;markerStart id="a2"/&gt;&lt;!-- # 2a --&gt; &lt;markerStart id="a3"/&gt;&lt;!-- # 2b --&gt; &lt;a&gt;&lt;!-- # 2 --&gt; &lt;b&gt; &lt;c&gt; &lt;markeEnd id="a2"/&gt; &lt;a&gt;&lt;!-- # 3 --&gt; &lt;b&gt; &lt;c&gt; &lt;markeEnd id="a3"/&gt; &lt;/c&gt; &lt;/b&gt; &lt;/a&gt; &lt;/c&gt; &lt;/b&gt; &lt;/a&gt; &lt;markerStart id="a5"/&gt; &lt;a&gt;&lt;!-- # 4 --&gt; &lt;markerStart id="a4"/&gt; &lt;b&gt; &lt;c&gt; &lt;markeEnd id="a4"/&gt; &lt;/c&gt; &lt;/b&gt; &lt;/a&gt; &lt;a&gt;&lt;!-- # 5 --&gt; &lt;b&gt; &lt;c&gt; &lt;markeEnd id="a5"/&gt; &lt;/c&gt; &lt;/b&gt; &lt;/a&gt; &lt;/c&gt; &lt;/b&gt; &lt;/a&gt; &lt;/root&gt; </code></pre> <p>I need to used XSL 1.0 for this problem. Any help is more than appreciated.</p>
 

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