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       registerNs
             $xpc->registerNs($prefix, $namespace_uri)

           Registers namespace $prefix to $namespace_uri.

     <?xml version="1.0" encoding="utf-8" ?>
     <propfind xmlns="DAV:">
       <propname/>
     </propfind>

     <?xml version="1.0" encoding="utf-8" ?>
     <D:propfind xmlns:D="DAV:">
...
         <R:Random/>
       </D:prop>
     </D:propfind>