edupub (non-h1..h6) heading not recognized as section heading

[kriro]

When I have a run-in heading in my EDUPUB publication like so:

<section aria-labelledby="sec-heading">
    <p><span aria-level="1" role="heading" id="sec-heading">Section heading (run-in)</span> Section contents.</p>
</section>

when validating with epubcheck 5.0.0 under the EDUPUB profile, I get the following error:

epubcheck error: ERROR(RSC-005): […]: Error while parsing file: section does not have a heading.

https://idpf.org/epub/profiles/edu/spec/#h.frvc45xf6cia 3rd paragraph suggests that I should be able to use aria-labelledby to associate the section with its heading, which cannot be a ranked HTML5 heading at that place due to p's content model restriction. That is why I use role="heading" and aria-level="1" as the equivalent to h1.

Is this an epubcheck issue, EDUPUB issue, or me misunderstanding the relevant spec's wording?

[rdeltour]

Is this an epubcheck issue, EDUPUB issue, or me misunderstanding the relevant spec's wording?

This may be a limitation in EPUBCheck, at first sight the markup looks legit.

The checks for EDUPUB are quite old and I don't remember if ARIA-defined headings are supported. I'll have a look. Thanks for the report!

[mattgarrish]

Edupub is kind of dead at this point, too. There's a new education task force in the Publishing Community Group looking into publishing requirements for education. You can find some info on it here https://www.w3.org/events/meetings/9ce5bd96-5a87-4448-a4ba-7fafafb9dcdf/20230208T100000