problem parsing xml with namespaces...

[Nacho Conde]

Hi, i need parse xml files as this:
  
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<rdf:RDF xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";         
   
xsi:noNamespaceSchemaLocation="http://10.65.1.69:80/NASApp/wete/ServletUAProf?esquema=20041213062312.xsd";>
   <rdf:Description ID="88320000000">
       <prf:component>
           <rdf:Description ID="BrowserUA">
               <prf:BrowserName/>
               <prf:BrowserVersion/>
           </rdf:Description>
       </prf:component>
    </rdf:Description>
</rdf:RDF>

when i parse the document, the error is: "The prefix  'rdf' has not been 
mapped to any URI"
i configure de parse liaison whit, setUseValidation(false) and 
setDoNamespaces(false),
i not have access to the url , but i need parse the document,

someone idea?
Thanks