PDF/A-3 support

[xsuchy09]

There is missing support for PDF/A-3. Required attribute AFRelationship of attached file is missing. Same issue in qpdf.

3.2 PDF/A-3’s restrictions
PDF/A-3, which introduced Associated Files to PDF in 2012, imposes some additional
requirements that are not present in PDF 2.0:
• PDF/A-3 excludes external file references, so associations can be specified only for
embedded files
• Since PDF/A-3 requires the AF entry for all embedded files, each file’s MIME-type is
always required
• PDF/A-3 requires every embedded file to be an Associated File and thus requires
the AFRelationship entry in each case
• The list of objects for which the AF entry may be present is explicitly open in PDF
2.0 and an AF entry may be used anywhere in a PDF file. However, in PDF/A-3 this
list is closed and the AF entry may only be present in the locations explicitly
identified in the standard.
• PDF/A-3 has - similar to the list defined in PDF 2.0 - a list of possible objects in
which the AF entry may be present (ISO 19005-3, Table E.1). However, the list in
PDF/A-3 lacks the DPart entry

[rosx27]

any update to this?

[jbarlow83]

PDF/A-3 excludes external file references, so associations can be specified only for embedded files

Associated Files are now constructed automatically.

Since PDF/A-3 requires the AF entry for all embedded files, each file’s MIME-type is always required

The AF entry is now created. Adding a MIME type for each file is a decision on the part of the library user.

PDF/A-3 requires every embedded file to be an Associated File and thus requires the AFRelationship entry in each case

This is now implemented.

The list of objects for which the AF entry may be present is explicitly open in PDF 2.0 and an AF entry may be used anywhere in a PDF file. However, in PDF/A-3 this list is closed and the AF entry may only be present in the locations explicitly identified in the standard.

It would be up to the library user to follow this standard when generating PDF/A-3

PDF/A-3 has - similar to the list defined in PDF 2.0 - a list of possible objects in which the AF entry may be present (ISO 19005-3, Table E.1). However, the list in PDF/A-3 lacks the DPart entry

Not implemented, although a library user could create this construct on their own.