[NTG-context] Re: non standard tag for structure

23 Mar 2025

      Hi Pablo, Wolfgang, Hans,

is there any news on the accessibility topic (text Alt on a specific image element)?

Yours, Steffen
...
Am 25.02.2025 um 17:45 schrieb Pablo Rodriguez via ntg-context :
Hans,
with the following source, veraPDF-1.29.11 complains about a
non-standard tag named /documentpart:
\setuptagging[state=start]
\setupbackend
    [format=PDF/A-3a,
     intent=sRGB IEC61966-2.1,
     level=0]
\starttext
    whatever
\pdfbackendactualtext{abc}{hoh}
  \stoptext
The problematic object reads:
4 0 obj
  <<
    /K 28 0 R
    /ParentTree 5 0 R
    /RoleMap <<
      /break /NonStruct
      /document /Document
      /documentpart /DocumentFragment
      /navigationpage /NonStruct
...
...
/Type /StructTreeRoot
...
endobj
If I replace (according to
https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008....)
/documentpart with /Part, validation in veraPDF is perfectly fine.
BTW, /DocumentFragment seems not to be included in PDF-1.7
(https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008....).
According to
https://github.com/veraPDF/veraPDF-model/blob/4c8e855b68546547971121281ff2ab...,
/DocumentFragment seems to be only available in PDF-2.0.
Providing a patch for strc-tag.lmt would be easy, but this would affect
to ua-2 (which may use /DocumentFragment).
Many thanks for your help,
Pablo
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
archive  : https://github.com/contextgarden/context
wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________

[NTG-context] Re: non standard tag for structure

Steffen Wolfrum