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POXML::LibXML's notion of a text node's parent
 

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    <p>Something seems odd here.</p> <p>In the example below, I'm accessing text nodes via an XPath query ( <code>//book/isbn/text()</code> ). The <code>text()</code> is necessary to coerce <code>XML::LibXML</code> into allowing me to use the <code>XML::LibXML::Text</code> methods.</p> <p>To get to the parent node though, I have to invoke the <code>parentNode</code> method twice to get the true parent node (<code>&lt;book&gt;</code> in this case):</p> <pre><code>use strict; use warnings; use XML::LibXML; my $xml = XML::LibXML-&gt;new-&gt;parse_string( &lt;&lt; 'MAIN' ); &lt;library&gt; &lt;book&gt; &lt;title&gt;Perl Best Practices&lt;/title&gt; &lt;author&gt;Damian Conway&lt;/author&gt; &lt;isbn&gt;0596001738&lt;/isbn&gt; &lt;pages&gt;542&lt;/pages&gt; &lt;image src="http://www.oreilly.com/catalog/covers/perlbp.s.gif" width="145" height="190" /&gt; &lt;/book&gt; &lt;book&gt; &lt;title&gt;Perl Cookbook, Second Edition&lt;/title&gt; &lt;author&gt;Tom Christiansen&lt;/author&gt; &lt;author&gt;Nathan Torkington&lt;/author&gt; &lt;isbn&gt;0596003137&lt;/isbn&gt; &lt;pages&gt;964&lt;/pages&gt; &lt;image src="http://www.oreilly.com/catalog/covers/perlckbk2.s.gif" width="145" height="190" /&gt; &lt;/book&gt; &lt;/library&gt; MAIN foreach my $isbn ( $xml-&gt;findnodes( '//book/isbn/text()' ) ) { # Do something with $isbn-&gt;setData() my $book = $isbn-&gt;parentNode-&gt;parentNode; # My daddy's daddy is my daddy? print $book-&gt;toString; } </code></pre> <h3>Output</h3> <pre><code>&lt;book&gt; &lt;title&gt;Perl Best Practices&lt;/title&gt; &lt;author&gt;Damian Conway&lt;/author&gt; &lt;isbn&gt;0596001738&lt;/isbn&gt; &lt;pages&gt;542&lt;/pages&gt; &lt;image src="http://www.oreilly.com/catalog/covers/perlbp.s.gif" width="145" height="190"/&gt; &lt;/book&gt;&lt;book&gt; &lt;title&gt;Perl Cookbook, Second Edition&lt;/title&gt; &lt;author&gt;Tom Christiansen&lt;/author&gt; &lt;author&gt;Nathan Torkington&lt;/author&gt; &lt;isbn&gt;0596003137&lt;/isbn&gt; &lt;pages&gt;964&lt;/pages&gt; &lt;image src="http://www.oreilly.com/catalog/covers/perlckbk2.s.gif" width="145" height="190"/&gt; &lt;/book&gt; </code></pre> <hr> <p>So:</p> <ul> <li>is my understanding of XML nodes incorrect in assuming that <code>//isbn</code> and <code>//isbn/text()</code> are the same node, or</li> <li>is this a bug in <a href="http://search.cpan.org/perldoc?XML%3a%3aLibXML" rel="nofollow"><code>XML::LibXML</code></a>'s <code>parentNode</code> method?</li> </ul>
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    1. CONote that `isbn[text()]` will select isbn elements that have text nodes, if that's what you want. `$isbn->textContent()` will get the text context, and `$isbn->parentNode()` will get the book element.
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