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POHow to find ancestor-or-self that is a child of an element with particular attribute?
 

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  1. POHow to find ancestor-or-self that is a child of an element with particular attribute?
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    <p>I'm working with a very generic XML structure, where everything is an item (well everything relevant to this question anyway). </p> <p>Based on knowing the item element I'm currently on and the item element that is the parent of the node I'm looking for, I need to find an item. I have a working xpath, but it's fairly resource intensive and I'm looking for something more elegant and cheaper.</p> <p>The item key=a node is the parent of the element I'm looking for (though it's not actually a child of the document root)</p> <p>XML:</p> <pre class="lang-xml prettyprint-override"><code>&lt;root&gt; &lt;item key="a"&gt; &lt;item key="b"&gt; &lt;item key="c"&gt; &lt;item key="d"/&gt; &lt;/item&gt; &lt;/item&gt; &lt;item key="e"&gt; &lt;item key="f"&gt; &lt;item key="g"/&gt; &lt;/item&gt; &lt;/item&gt; &lt;/item&gt; &lt;/root&gt; </code></pre> <p>The actual XML is much deeper and with far more branching.</p> <p>So for instance, if I'm on the item with key=g, e or f I need to return the item with key=e. If I'm on the item with key b,c or d I need to return the item with key=b.</p> <p>I'm using this xpath, which is working, but going up and then back down the ancestor-descendant axis seems a far longer trip than I need.</p> <pre><code>current() /ancestor-or-self::item[@key='a'] /item[descendant-or-self::* = current()] </code></pre> <p>Is there a simpler way of doing this, bearing in mind that I only know 1) the node I'm on and 2) the key attribute of the parent of the node I'm looking for?</p> <p>Just for detail's sake: The XML is Sitecore generated, I'm not actually using the current() function, I'm using the sc_currentitem parameter to set the start node I need to begin processing at.</p> <p>Thanks in advance.</p>
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    1. USBartłomiej Mucha
    1. USJames Walford
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    1. COLooks quite simple, already (in my eyes). I've seen much scarier XPaths.
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      1. USjwueller
    2. COIt's not the complexity, it's the depth of the XML it's processing that's scary. The parent of the node I'm looking for could have a vast number of item children/descendants, I really don't want to go down every branch.
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      1. USJames Walford
 

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