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POXPath-REXML-Ruby: Selecting multiple siblings/ancestors/descendants
 

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  1. POXPath-REXML-Ruby: Selecting multiple siblings/ancestors/descendants
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    <p>This is my first post here. I have just started working with Ruby and am using REXML for some XML handling. I present a small sample of my xml file here: </p> <pre><code> &lt;record&gt; &lt;header&gt; &lt;identifier&gt;oai:lcoa1.loc.gov:loc.gmd/g3195.ct000379&lt;/identifier&gt; &lt;datestamp&gt;2004-08-13T15:32:50Z&lt;/datestamp&gt; &lt;setSpec&gt;gmd&lt;/setSpec&gt; &lt;/header&gt; &lt;metadata&gt; &lt;titleInfo&gt; &lt;title&gt;Meet-konstige vertoning van de grote en merk-waardige zons-verduistering&lt;/title&gt; &lt;/titleInfo&gt; &lt;/metadata&gt; &lt;/record&gt; </code></pre> <p>My objective is to match the last numerical value in the tag with a list of values that I have from an array. I have achieved this with the following code snippet:</p> <pre><code>ids = XPath.match(xmldoc, "//identifier[text()='oai:lcoa1.loc.gov:loc.gmd/"+mapid+"']") </code></pre> <p>Having got a particular identifier that I wish to investigate, now I want to go back to and select and then select to get the value in the node for that particular identifier.</p> <p>I have looked at the XPath tutorials and expressions and many of the related questions on this website as well and learnt about axes and the different concepts such as ancestor/following sibling etc. However, I am really confused and cannot figure this out easily.</p> <p>I was wondering if I could get any help or if someone could point me towards an online resource "easy" to read.</p> <p>Thank you.</p> <p>UPDATE: </p> <p>I have been trying various combinations of code such as:</p> <pre><code>idss = XPath.match(xmldoc, "//identifier[text()='oai:lcoa1.loc.gov:loc.gmd/"+mapid+"']/parent::header/following-sibling::metadata/child::mods/child::titleInfo/child::title") </code></pre> <p>The code compiles but does not output anything. I am wondering what I am doing so wrong.</p>
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    1. COYour sample XML has an extra header. Is that intended?
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    2. COOops. That was my mistake. Fixed. :)
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