[accessibility] Current packages and methods of generating tagged PDF from LaTeX

[Michal Hoftich]

> I doubt it, perhaps some parts can be reused but pdf has really rather
> special requirements. Beside this tex4ht is imho quite stable, mature and
> powerful.

The problem with the the PDF syntax is that it seems to be quite
low-level, basically HTML, so it captures lot less information than
what tex4ht already does and it wouldn't work for other output formats
than HTML (ODT, DocBook,..).

If there was a higher level structural tagging standard provided by
the LaTeX kernel and maintained packages, I think we could reuse that
information in tex4ht. For example something like dpub-aria:
https://w3c.github.io/dpub-aria/#doc-chapter.
It shouldn't be hard to map such higher level information to the PDF
tagging, HTML 5, ODT and other formats.

Best regards,
Michal