Stefan Berger created FOP-3006:
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Summary: XMP Metadata in created PDF/A-2 documents is not valid
Key: FOP-3006
URL: https://issues.apache.org/jira/browse/FOP-3006
Project: FOP
Issue Type: Bug
Affects Versions: 2.6, trunk
Reporter: Stefan Berger
Attachments: fop_invalid_metadata.pdf
When you set the "pdf-a-mode" to "PDF/A-2a" and generate a PDF, it will not
pass the validation because `<dc:language>` and `<dc:date>` are not valid.
In the case of `<dc:language>`, it should contain a `<rdf:Bag>`, and
`<dc:date>` should contain a `<rdf:Seq>`.
The offending code is this one:
[https://github.com/apache/xmlgraphics-fop/blob/trunk/fop-core/src/main/java/org/apache/fop/pdf/PDFMetadata.java#L149|https://github.com/apache/xmlgraphics-fop/blob/678d6c0e04fd6a5464012be0241bb771cf9bb506/fop-core/src/main/java/org/apache/fop/pdf/PDFMetadata.java#L149]
By setting `compact` to `true`, Bags and Sequences are not created.
Attached you will find a PDF/A-2a file generated by Apache FOP and VeraPDF's
validation results. Other validators also report the same error.
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