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I am having troubles exporting a PDF to PDF/A-1b using Adobe Acrobat X Pro. I've already asked the same question at the official Adobe forum, but got no response. I hope somebody here could explain what is going on...

When I try to export a PDF/A-1b from a source PDF that also contains metadata from http://purl.org/dc/terms/ namespace, such as,


<rdf:Description rdf:about="" xmlns:dcterms="http://purl.org/dc/terms/">
     <dcterms:alternative>Alternative Title</dcterms:alternative>
</rdf:Description>

I get an error saying that: "XMP property neither predefined nor defined in extension schema" although the root RDF element includes xmlns:dcterms = "http://purl.org/dc/terms/". At the moment I delete all dcterms elements the document exports correctly.

What's wrong?

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Sorry, but how is this related to LaTeX? – azetina Aug 15 '12 at 20:36
Answer: forums.adobe.com/message/4680019 – Petr Sep 7 '12 at 8:25

closed as off topic by Gonzalo Medina, Harish Kumar, Marco Daniel, Martin Schröder, Joseph Wright♦ Aug 17 '12 at 14:42

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