another question about metadata

Mon, 26 Jan 2009 02:50:52 -0800 

When I write metadata with pdfbox, by this way:

PDDocument document = PDDocument.load("/root/saper.pdf");
PDDocumentInformation metadata = document.getDocumentInformation();
metadata.setKeywords("whereisnow??");
document.setDocumentInformation(metadata);
document.save("/root/saper_saved.pdf");

the data has been written here:
<<
/Author (autore)
/CreationDate (D:20050217131520+01'00')
/Creator (Updated By XMP SDK)
/Keywords (whereisnow??)

and of course I'm not using any namespace.
Using adobe xmp sdk (on windows), metadata has been written using a custom namespace (http://www.whereisnow.com) 
and the pdf file contains it by this way:

<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 4.4.0">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";>
 <rdf:Description rdf:about=""
   ...
   ...
   xmlns:winKey="http://www.whereisnow.com";
   ...
   ...
  winKey:Keywords="blablabla">

How can I reproduce the same thing through pdfbox??

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