reading/writing xmp data on pdf file

Fri, 23 Jan 2009 01:27:31 -0800 

here a snipped from my pdf file:


<?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:pdf="http://ns.adobe.com/pdf/1.3/";
   xmlns:xmp="http://ns.adobe.com/xap/1.0/";
   xmlns:dc="http://purl.org/dc/elements/1.1/";
   xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/";
  pdf:Keywords="blablabla"     ->>>> I need this string


how can I do that???

thanks in advance
Giancarlo f.

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