Problem with XMP-Metadata and PDF/A-Validation

[Stenersen, Björn WI (Fa. Kessler Beratung)]

Hello,
i am trying to create a pdf/a with FOP 1.1, but the validation of the generated 
PDF always fails due to corrupt xmp-metadata.
I tried several Validators, all of them report the same error:

XMP metadata: Property 'language' in predefined XMP schema 
'http://purl.org/dc/elements/1.1/' for PDF/A has wrong value type (must be 
'rdf:bag')
(http://www.pdflib.com/knowledge-base/xmp-metadata/free-xmp-validator/)

So I tried to fix the problem by declaring the language-property in my 
fo:declarations-section:

<fo:declarations>
        <x:xmpmeta xmlns:x="adobe:ns:meta/" 
xmlns:dc="http://purl.org/dc/elements/1.1/"; 
xmlns:xmp="http://ns.adobe.com/xap/1.0/"; 
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";>
                <dc:creator>
                        <rdf:Seq>
                                <rdf:li>
                                        CREATOR
                                </rdf:li>
                        </rdf:Seq>
                </dc:creator>
                <dc:language>
                        <rdf:Bag>
                                <rdf:li>
                                        de-DE
                                </rdf:li>
                        </rdf:Bag>
                </dc:language>
                <dc:date>
                <rdf:Seq>
                        <rdf:li>1999-08-01T12:56:02+02:00</rdf:li>
                </rdf:Seq>
         </dc:date>
                <xmp:CreatorTool>My App</xmp:CreatorTool>
        </x:xmpmeta>
</fo:declarations>

In the resulting PDF the metadata looks like this:

<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?><x:xmpmeta 
xmlns:x="adobe:ns:meta/">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";>
      <rdf:Description xmlns:dc="http://purl.org/dc/elements/1.1/"; rdf:about="">
         <dc:format>application/pdf</dc:format>
         <dc:language>x-unknown</dc:language>
         <dc:creator>
            <rdf:Seq>
               <rdf:li>CREATOR</rdf:li>
            </rdf:Seq>
         </dc:creator>
         <dc:date>
            <rdf:Seq>
               <rdf:li>1999-08-01T12:56:02+02:00</rdf:li>
               <rdf:li>2013-08-01T13:53:08+02:00</rdf:li>
            </rdf:Seq>
         </dc:date>
      </rdf:Description>
      <rdf:Description xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/"; 
rdf:about="">
         <pdfaid:conformance>B</pdfaid:conformance>
         <pdfaid:part>1</pdfaid:part>
      </rdf:Description>
      <rdf:Description xmlns:pdf="http://ns.adobe.com/pdf/1.3/"; rdf:about="">
         <pdf:PDFVersion>1.4</pdf:PDFVersion>
         <pdf:Producer>Apache FOP Version SVN tags/fop-1_1</pdf:Producer>
      </rdf:Description>
      <rdf:Description xmlns:xmp="http://ns.adobe.com/xap/1.0/"; rdf:about="">
         <xmp:CreateDate>2013-08-01T13:53:08+02:00</xmp:CreateDate>
         <xmp:CreatorTool>My App</xmp:CreatorTool>
         <xmp:MetadataDate>2013-08-01T13:53:08+02:00</xmp:MetadataDate>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>
<?xpacket end="r"?>

Is anyone experiencing the same problem? Any tips how to fix this?

Thanks Björn

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