Strange XPath behaviour with attributes and namespaces

Hello,

I've encountered a strange XPath behavior when looking for attributes
declared within a specific namespace with XML::LibXML and libxml2.When
i execute an expression if the form //@ns:* I get all the attributes
in the document, no matter their namespace.

Here's a sample input file:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<rdf:RDF
  xmlns="http://www.w3.org/2000/svg"
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:cc="http://web.resource.org/cc/"
  xmlns:dc="http://purl.org/dc/elements/1.1/"
  id="RDF83"
>
 <cc:Work rdf:about="" id="Work84">
   <dc:format id="format85">image/svg+xml</dc:format>
   <dc:type id="type87" rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
 </cc:Work>
</rdf:RDF>


When I try to count the attributes declared in the namespace rdf
"http://www.w3.org/1999/02/22-rdf-syntax-ns#" with the following XPath
expressions I get:

xpath count (//@rdf:*): 6 attributes
xpath count (//@*): 6 attributes
xpath count (//@*[namespace-uri() =
'http://www.w3.org/1999/02/22-rdf-syntax-ns#']): 2 attributes

Am I wrong of thinking that //@rdf:* will find all attributes declared
in the namespace rdf or is this a bug?

-- 
Emmanuel Rodriguez
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