On 2025-05-01 06:32, Pablo Rodriguez via ntg-context wrote:
On 5/1/25 00:02, Rik Kabel wrote:
[...]
I took the route described in the mailing list at https://www.mail-
archive.com/ntg-context@ntg.nl/msg64956.html and inserted it
successfully as follows:
|\setupbackend[format={PDF/UA-1}] \setuptagging[state=start]
\enabledirectives[backend.usetags=crap] \startluacode
lpdf.injectxmpinfo("xml://rdf:RDF","<rdf:Description rdf:about=''
xmlns:tdm='http://www.w3.org/ns/tdmrep/'><tdm:reservation>1</
tdm:reservation></rdf:Description>",false) \stopluacode |
Many thanks for the code, Rik.
Just in case anyone intends to use any form of TDM reservation, it seems
that it might break PDF/A validation.
I haven’t tested it, but there is a warning:
https://www.w3.org/community/reports/tdmrep/CG-FINAL-tdmrep-20240510/#issue-container-generatedID-6.
Just in case it helps,
Pablo
Indeed, it does fail VeraPDF tests for PDF/A-3A if no effort is made to
accept the XMP, but it passes VeraPDF testing as PDF/UA-1.
At https://pdfa.org/resource/iso-14289-pdfua/, one can read:
> PDF/UA-1 documents may also conform to PDF/A-2 (ISO 19005-2) or
PDF/A-3 (ISO 19005-3). In such cases, these PDF/A standards require the
inclusion of XMP Extension Schema for custom XMP metadata not defined in
the relevant ISO 19005 part. The PDF Association provides free XMP
Extension Schema templates for PDF/UA-1, other ISO PDF subset standards,
and PDF Declarations.
The phrase "free XMP Extension Schema templates" links to
https://pdfa.org/resource/xmp-extension-schema-templates/, where we
read, inter alia:
> This W3C report _incorrectly_ notes that PDF/A validators will raise
errors if TDMRep properties are present in the XMP metadata section of
PDF documents. As clearly stated in ISO 19005-1 (PDF/A-1), ISO 19005-2
(PDF/A-2), and ISO 19005 (PDF/A-3) appropriate XMP Extension Schema must
always be included. This download link (XML) is a free XMP Extension
Schema template in “PDF/A extension schema container schema” syntax
appropriate for inclusion in PDF/A-1, PDF/A-2, and PDF/A-3 files that
supports TDMRep.
I have not succeeded in integrating the provided extension schema.
-\-
Rik
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