I tried PDF/A a while back and noticed the XMP header has an extra byte order mark which validators flagged as “??”.

I’ve attached the patch I used to remove it, however I’m still on an old version of ConTeXt so this might not apply cleanly to yours.

You might need to open the patch in a hex editor to see the difference in the two lines as most text editors will not show the BOM.

Leo

On Fri, 2 Nov 2018 at 20:12, luigi scarso <luigi.scarso@gmail.com> wrote:

Il giorno ven 2 nov 2018, 19:06 Rik Kabel <context@rik.users.panix.com> ha scritto:

The example file in the wiki (at https://wiki.contextgarden.net/PDF/A) no longer verifies as compliant PDF/A. VeraPDF rejects it, and https://www.pdf-online.com/osa/validate.aspx complains:

x107.pdf

Compliance pdfa-1b

Result Document does not conform to PDF/A.

Details

Validating file "x107.pdf" for conformance level pdfa-1b

Invalid content of XMP packet header attribute 'begin': '??'.

The property 'pdfx:ConTeXt.Support' is not defined in schema 'PDF/X ID Schema'.

The property 'pdfx:TeX.Support' is not defined in schema 'PDF/X ID Schema'.

The property 'pdfx:LuaTeX.Version' is not defined in schema 'PDF/X ID Schema'.

The property 'pdfx:LuaTeX.Functionality' is not defined in schema 'PDF/X ID Schema'.

The property 'pdfx:LuaTeX.LuaVersion' is not defined in schema 'PDF/X ID Schema'.

The property 'pdfx:LuaTeX.Platform' is not defined in schema 'PDF/X ID Schema'.

The document does not conform to the requested standard.

The document's meta data is either missing or inconsistent or corrupt.

The document does not conform to the PDF/A-1b standard.

Done.

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I will check it asap
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If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________

	x107.pdf
Compliance	pdfa-1b
Result	Document does not conform to PDF/A.
Details	Validating file "x107.pdf" for conformance level pdfa-1b Invalid content of XMP packet header attribute 'begin': '??'. The property 'pdfx:ConTeXt.Support' is not defined in schema 'PDF/X ID Schema'. The property 'pdfx:TeX.Support' is not defined in schema 'PDF/X ID Schema'. The property 'pdfx:LuaTeX.Version' is not defined in schema 'PDF/X ID Schema'. The property 'pdfx:LuaTeX.Functionality' is not defined in schema 'PDF/X ID Schema'. The property 'pdfx:LuaTeX.LuaVersion' is not defined in schema 'PDF/X ID Schema'. The property 'pdfx:LuaTeX.Platform' is not defined in schema 'PDF/X ID Schema'. The document does not conform to the requested standard. The document's meta data is either missing or inconsistent or corrupt. The document does not conform to the PDF/A-1b standard. Done.