Re: XMP metadata schema yields invalid PDF/A - luigi scarso via ntg-context

From: luigi scarso via ntg-context <ntg-context@ntg.nl>
To: Karl Pettersson <karl.pettersson@klpn.se>
Cc: luigi scarso <luigi.scarso@gmail.com>,
	mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: XMP metadata schema yields invalid PDF/A
Date: Sat, 5 Feb 2022 09:59:44 +0100	[thread overview]
Message-ID: <CAG5iGsAFGGX+xXqEUr50G-2oHZj9zg5xk+b1PYFuDKHxKH3UkQ@mail.gmail.com> (raw)
In-Reply-To: <Yf450DSUa2WAqScs@karl-ThinkPad-P50>

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On Sat, Feb 5, 2022 at 9:48 AM Karl Pettersson <karl.pettersson@klpn.se>
wrote:

>
> Attach metadata xml for the non-validating and validating example
> (extraced with `pdfinfo -meta | xmllint format -`) in the
> Github issue.
>
> Here is a reference to the description element. Note that only
> description seems to be redefined, not title.
>

it's not redefined -- it's dropped. And this is ok.
You can also check with
  <dc:description>FOO</dc:description>
      <dc:title>
        <rdf:Alt>
          <rdf:li xml:lang="x-default">TITLE</rdf:li>
        </rdf:Alt>
      </dc:title>
and again it's valid.
But
https://www.iso.org/obp/ui/#iso:std:iso:19005:-1:ed-1:v2:cor:1:v1:en
and
https://www.iso.org/obp/ui/#iso:std:iso:19005:-1:ed-1:v2:cor:2:v1:en:tab:1
suggest that dc:description and dc:title are of the same type,
which is coherent with
XMPSpecificationPart1.pdf
as in
https://github.com/adobe/XMP-Toolkit-SDK/tree/main/docs

I.e. these are correct   --  but Subject must agree with dc:description
  <dc:description>
        <rdf:Alt>
          <rdf:li xml:lang="x-default"/>
        </rdf:Alt>
      </dc:description>
      <dc:title>
        <rdf:Alt>
          <rdf:li xml:lang="x-default">TITLE</rdf:li>
        </rdf:Alt>
      </dc:title>

At least, this is what I understand.

-- 
luigi

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