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Subject: Re: XMP metadata schema yields invalid PDF/A
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On Sat, Feb 05, 2022 at 12:37:44AM +0100, luigi scarso via ntg-context wrote:
> On Fri, Feb 4, 2022 at 11:11 PM Karl Pettersson via ntg-context <
> ntg-context@ntg.nl> wrote:
> 
> > On Fri, Feb 04, 2022 at 10:25:27PM +0100, Hans Hagen via ntg-context wrote:
> > > On 2/4/2022 7:29 PM, Karl Pettersson via ntg-context wrote:
> > > > Hi
> > > >
> > > > PDF/A files generated using ConTeXt fail validation with veraPDF, and
> > > > the reason seems to be that the dc:description metadata is defined with
> > > > the wrong type in the embedded XMP extension schema.
> > > >
> > > >
> > https://tex.stackexchange.com/questions/632380/generate-pdf-a-with-context
> > > >
> > > > https://github.com/veraPDF/veraPDF-library/issues/1224
> > > >
> > > > I can reproduce the problem using TeX Live 2021 (MkIV 2021.03.05). The
> > > > definition seems to be controlled by this code.
> > > >
> > > >
> > https://source.contextgarden.net/tex/context/base/mkiv/lpdf-pua.xml?search=rdf#l81
> > > so "dc:description" is not permitted? it is mentioned in
> > >
> > >
> > https://www.dublincore.org/specifications/dublin-core/dcmi-terms/#http://purl.org/dc/elements/1.1/description
> > >
> > > (btw it never failed before)
> >
> > The description element is permitted, but the problem seems to be that
> > its valueType is defined as Text in the embedded schema, while the
> > metadata element in the PDF has an embedded <rdf:Alt><rdf:li
> > xml:lang="x-default"> structure.
> >
> >
> > https://github.com/veraPDF/veraPDF-library/issues/1224#issuecomment-1029932963
> >
> > (I suppose the reference to "title" in the issue comment should be
> > "description".)
> >
> > Validating with veraPDF <1.20 does not raise the error. The validation
> > seems to have changed for redefined types in that version.
> >
> >
> > https://github.com/veraPDF/veraPDF-library/blob/integration/RELEASENOTES.md#validation
> 
> 
> I am missing something here... true
> <dc:description>FOO</dc:description>
> makes a valid pdf 3a with verapdf 1.20.1.
> But dc:description is like dc:title, so where we are redefining
> dc:description as Text ?
> 
> -- 
> luigi

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.

https://source.contextgarden.net/tex/context/base/mkiv/lpdf-pua.xml#l81

> ___________________________________________________________________________________
> 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
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________


-- 
Karl Pettersson
Uppsala, Sweden

https://static-dust.klpn.se/

--ImGF4TvkZCC4MtNF
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      <dc:creator>
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      <pdfx:ID>out | 2022-02-02T21:34:48+01:00</pdfx:ID>
      <pdfx:ConTeXt.Jobname>out</pdfx:ConTeXt.Jobname>
      <pdfx:ConTeXt.Time>2022-02-02 21:34</pdfx:ConTeXt.Time>
      <pdfx:ConTeXt.Url>www.pragma-ade.com</pdfx:ConTeXt.Url>
      <pdfx:ConTeXt.Support>contextgarden.net</pdfx:ConTeXt.Support>
      <pdfx:ConTeXt.Version>2019.03.21 21:39</pdfx:ConTeXt.Version>
      <pdfx:ConTeXt.LMTX/>
      <pdfx:TeX.Support>tug.org</pdfx:TeX.Support>
      <pdfx:LuaTeX.Version>1.10</pdfx:LuaTeX.Version>
      <pdfx:LuaTeX.Functionality>7127</pdfx:LuaTeX.Functionality>
      <pdfx:LuaTeX.LuaVersion>5.3</pdfx:LuaTeX.LuaVersion>
      <pdfx:LuaTeX.Platform>linux-64</pdfx:LuaTeX.Platform>
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      <xmp:CreateDate>2022-02-02T21:34:48+01:00</xmp:CreateDate>
      <xmp:CreatorTool>LuaTeX 1.10 7127 + ConTeXt MkIV 2019.03.21 21:39</xmp:CreatorTool>
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    <rdf:Description xmlns:pdf="http://ns.adobe.com/pdf/1.3/" rdf:about="">
      <pdf:Keywords/>
      <pdf:Producer>LuaTeX-1.10</pdf:Producer>
      <pdf:Trapped>False</pdf:Trapped>
    </rdf:Description>
    <rdf:Description xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/" rdf:about="">
      <xmpMM:DocumentID>uuid:77baf08a-41c6-87cb-47d0-807f764f5064</xmpMM:DocumentID>
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    <rdf:Description xmlns:pdfaExtension="http://www.aiim.org/pdfa/ns/extension/" xmlns:pdfaProperty="http://www.aiim.org/pdfa/ns/property#" xmlns:pdfaSchema="http://www.aiim.org/pdfa/ns/schema#" rdf:about="">
      <pdfaExtension:schemas>
        <rdf:Bag>
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            <pdfaSchema:prefix>pdf</pdfaSchema:prefix>
            <pdfaSchema:schema>Adobe PDF Schema</pdfaSchema:schema>
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              <rdf:Seq>
                <rdf:li rdf:parseType="Resource">
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            <pdfaSchema:valueType>
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          </rdf:li>
          <rdf:li rdf:parseType="Resource">
            <pdfaSchema:namespaceURI>http://purl.org/dc/elements/1.1/</pdfaSchema:namespaceURI>
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            <pdfaSchema:property>
              <rdf:Seq>
                <rdf:li rdf:parseType="Resource">
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              <rdf:Seq>
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                  <pdfaProperty:description>Time stamp of ConTeXt version</pdfaProperty:description>
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                </rdf:li>
                <rdf:li rdf:parseType="Resource">
                  <pdfaProperty:category>external</pdfaProperty:category>
                  <pdfaProperty:description>ConTeXt support</pdfaProperty:description>
                  <pdfaProperty:name>ConTeXt.Support</pdfaProperty:name>
                  <pdfaProperty:valueType>Text</pdfaProperty:valueType>
                </rdf:li>
                <rdf:li rdf:parseType="Resource">
                  <pdfaProperty:category>external</pdfaProperty:category>
                  <pdfaProperty:description>ConTeXt version</pdfaProperty:description>
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                </rdf:li>
                <rdf:li rdf:parseType="Resource">
                  <pdfaProperty:category>external</pdfaProperty:category>
                  <pdfaProperty:description>ConTeXt LMTX version</pdfaProperty:description>
                  <pdfaProperty:name>ConTeXt.LMTX</pdfaProperty:name>
                  <pdfaProperty:valueType>Text</pdfaProperty:valueType>
                </rdf:li>
                <rdf:li rdf:parseType="Resource">
                  <pdfaProperty:category>external</pdfaProperty:category>
                  <pdfaProperty:description>TeX support</pdfaProperty:description>
                  <pdfaProperty:name>TeX.Support</pdfaProperty:name>
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                <rdf:li rdf:parseType="Resource">
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                  <pdfaProperty:description>LuaTeX version</pdfaProperty:description>
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                  <pdfaProperty:description>LuaTeX functionality</pdfaProperty:description>
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            <pdfaSchema:schema>XMP Media Management Schema</pdfaSchema:schema>
            <pdfaSchema:property>
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                  <pdfaProperty:description>UUID based identifier for specific incarnation of a document</pdfaProperty:description>
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            <pdfaSchema:property>
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      <pdfaid:conformance>A</pdfaid:conformance>
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<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
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