How do I add custom namespace properties in XMP metadata when generating/converting to PDF/A?

Technical Support Apryse SDK
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Q:

For PDF/A conversion we rely on ‘pdftron.PDF.PDFA.PDFACompliance’ from PDFTron PDFNet SDK.

The conversion works great, however I would like to be able to add some custom properties / metadata (i.e. extended XMP metadata in a custom namespace ).

a) Load initla XMP metadata from PDF (see How do I embed and extract XMP data associated with a PDF document?).

b) Convert to PDF/A

c) Overwrite the original metadata with your own version (this is also covered in the above article).

Note:

The problem is that PDF/A 1 - does not support compressed PDF streams, so failing to use the flag could introduce compatibility issue relared to ‘compressed object streams’