Skip navigation
Currently Being Moderated

XMP property neither predefined nor defined in extension schema

Aug 13, 2012 1:43 AM

Tags: #metadata #pdf/a-1b #dc



When I try to export a PDF/A-1b from a source PDF that also contains metadata from namespace, such as,


<rdf:Description rdf:about="" xmlns:dcterms="">

     <dcterms:alternative>Alternative Title</dcterms:alternative>



I get an error saying that: "XMP property neither predefined nor defined in extension schema". At the moment I delete all dcterms elements the document exports correctly.


What's wrong?



  • Currently Being Moderated
    Sep 6, 2012 12:26 PM   in reply to petmal85

    And how do you delete the uneeded elements ?

    Mark as:
  • Currently Being Moderated
    Sep 7, 2012 12:44 AM   in reply to PierrotRobert

    PDF/A only permits a subset of the XMP schema, if the document has anything else in it the standards check will fail. It's not Acrobat's fault, it's the way the ISO standard was written.


    In Acrobat Pro there's a preflight fixup called "Make document XMP Metadata compliant with PDF/A-1" that usually works, but it's not perfect. I have a feeling things will get better in future but right now the best option is to change the metadata before you try converting to PDF/A  (PDF properties > additional metadata > advanced) or edit it via an application such as Bridge.

    Mark as:

More Like This

  • Retrieving data ...

Bookmarked By (0)

Answers + Points = Status

  • 10 points awarded for Correct Answers
  • 5 points awarded for Helpful Answers
  • 10,000+ points
  • 1,001-10,000 points
  • 501-1,000 points
  • 5-500 points