On 2025-05-01 10:27, Rik Kabel wrote:
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.
Just modifying a local copy of mkiv/lpdf-pua.xml seems to do it. (There
is no separate equivalent in the mkxl tree, so this is used for both.)
Both sets of changes (the extension schema and the actual setting of
tdm) can be done there.
--
Rik
​
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