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POXPath doesn't match attributes without namespace as prefix
 

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    <p>Currently I'm trying to read different install.rdf files of Firefox extensions via PHP's SimpleXML.</p> <p>Unfortunately there's no predefined structure how they have to look. They are always using two namespaces, "<a href="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rel="nofollow">http://www.w3.org/1999/02/22-rdf-syntax-ns#</a>" and "<a href="http://www.mozilla.org/2004/em-rdf#" rel="nofollow">http://www.mozilla.org/2004/em-rdf#</a>".</p> <p>So my idea was to use an XPath to get the elements of interest:</p> <pre><code>$xml = simplexml_load_string($installRDF); $namespaces = $xml-&gt;getNameSpaces(true); $xml-&gt;registerXPathNamespace('rdf', NS_RDF); $main = $xml-&gt;xpath('/rdf:RDF/rdf:Description[@rdf:about="urn:mozilla:install-manifest"]'); </code></pre> <p>But there seems to be a problem regarding the <code>rdf</code> prefix of the <code>about</code> attribute, because it just returns a result, if there's also a prefix defined in the RDF file.</p> <p>So for this it works:</p> <pre><code>&lt;RDF:RDF xmlns:em="http://www.mozilla.org/2004/em-rdf#" xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"&gt; &lt;RDF:Description RDF:about="urn:mozilla:install-manifest"&gt; &lt;em:id&gt;extension@mozilla.org&lt;/em:id&gt; &lt;/RDF:Description&gt; &lt;/RDF:RDF&gt; </code></pre> <p>But for this not:</p> <pre><code>&lt;RDF xmlns:em="http://www.mozilla.org/2004/em-rdf#" xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"&gt; &lt;Description about="urn:mozilla:install-manifest"&gt; &lt;em:id&gt;extension@mozilla.org&lt;/em:id&gt; &lt;/Description&gt; &lt;/RDF&gt; </code></pre> <p>This looks like a bug in PHP to me, since if I remove the attribute from the XPath I am always getting the <code>Description</code> elements. But I am not aware of using namespaces in XPath yet, so I am asking here.</p>
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