Check feature dispositions

[nigelmegitt]

Closes #264 by adding missing feature dispositions. Also adds term definition links to each TTML2 feature.

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[nigelmegitt]

I noticed that the default Respec behaviour is to use the TTML2 1st Ed Rec, but we are referencing TTML2 features that are only introduced in 2nd Edition, so I updated the pull request to reference the most recent TTML2 CR Snapshot - unfortunately even though SpecRef knows that this is the most recent version of ttml2 it doesn't reference it. The alternative is to be explicit and point to [ttml2-20210309] but that's quite long winded, so instead I added a local bibliography reference.

Happy to revert it if we know a better way to alias [TTML2] to the latest 2nd Ed version.

[andreastai]

To be consistent it should say for #profile-root: "This is the profile expression of the prohibition of 5.6.3 ttp:profile."

[nigelmegitt]

To be consistent it should say for #profile-root: "This is the profile expression of the prohibition of 5.6.3 ttp:profile."

@andreastai Done (slightly differently) in 2bf8b2c:

This is the profile expression of the prohibition of the ttp:profile attribute on the <tt> element as specified in 5.6.3 ttp:profile.

[css-meeting-bot]

The Timed Text Working Group just discussed Check feature dispositions w3c/dapt#265, and agreed to the following:

• SUMMARY: Awaiting approval review

The full IRC log of that discussion

<nigel> Subtopic: Check feature dispositions #265
<nigel> github: https://github.com//pull/265
<cpn> Nigel: This was in response to an issue from Andreas. I think I fixed the inconsistency
<cpn> Andreas: I had a brief look, but haven't given feedback or approval yet
<cpn> Nigel: It's a substantive change, it would need checking. Would someone like to volunteer to do that?
<cpn> ... I'm not comfortable merging it directly, because of the potential impacts
<cpn> ... We need to check the profile documents and the dispositions match correctly
<cpn> Andreas: I can do it but not in the next days
<nigel> SUMMARY: Awaiting approval review

[andreastai]

• feature #contentProfiles is required in dapt processor profiles but it is optional in the dispositions
• extension represents is required in the dapt content profile but it is "only" permitted in the dispositions

Thanks @nigelmegitt

Otherwise the changes look good to me.

[nigelmegitt]

Thanks @andreastai , good catches! Fixed in 7dc454b.

[andreastai]

Thanks. Fixes in 7dc454b look good to me.