Parse Adob XMP data with Rev's XML lib?

[Sivakatirswami]

I am unable to parse the following using rev's library.
I'm not an xml expert... but, since several nodes all begin with

"rdf" I assume we need to refer to a node like this:

   put revXMLNodeContents(tMetaData, 
"/x:xmpmeta/rdf:RDF/rdf:Description/dc:description/rdf:Alt/rdf:li/")


but rev throw and error "xmlerr, can't find element"


<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Public XMP Toolkit Core 4.0">
    <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
       <rdf:Description rdf:about=""
             xmlns:dc="http://purl.org/dc/elements/1.1/">
          <dc:description>
             <rdf:Alt>
                <rdf:li xml:lang="x-default">Caption can be found 
here</rdf:li>
             </rdf:Alt>
          </dc:description>
       </rdf:Description>
    </rdf:RDF>
</x:xmpmeta>

In the meantime i can hack this by removing all tags as there is not 
data except the caption
in any of the nodes


TIA
Sivakatirswami
www.himalayanacademy.com