[FOP-3006] [PATCH] XMP Metadata in created PDF/A-2 documents is not valid

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6, 2.7
• Fix Version/s: 2.7
• Assignee: J Frank
• Reporter: Stefan Berger
• Created: 01/Apr/21 09:51
• Updated: 13/Oct/21 07:20
• Resolved: 12/Oct/21 13:34

Description

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

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.