Add explicit exceptions to ignoring element semantics with condition …

[skynavga]

…processing (#583).

Closes #583.

[nigelmegitt]

Content elements exclude region but @condition can be applied to region. I think this needs to be generalised to all elements that have timing semantics.

[skynavga]

Fixed in cbd9ce8.

[css-meeting-bot]

The Working Group just discussed Add explicit exceptions to ignoring element semantics with condition … ttml2#772, and agreed to the following:

• SUMMARY: @skynavga to update to include references to the timed element term, then review to continue.

The full IRC log of that discussion

<nigel> Topic: Add explicit exceptions to ignoring element semantics with condition … ttml2#772
<nigel> github: https://github.com//pull/772
<nigel> Glenn: I just did a commit last night to address comments.
<nigel> .. Nigel you pointed out that the use of content element wasn't sufficiently inclusive and
<nigel> .. suggested that we bring in all timed elements including region, so I introduced the
<nigel> .. term timed element. I had to review all the candidates for timed elements and decide
<nigel> .. what the distinguishing features were. I first thought timeContainer, but animate and set
<nigel> .. have begin and end but not timeContainer, since they don't have timed children.
<nigel> .. On the other hand everything had a begin, dur and end and I picked begin as a criterion.
<nigel> .. Then I changed content element ref to timed element so that should address your last
<nigel> .. comment and this should be ready to go.
<nigel> Nigel: Sounds good to me.
<nigel> Glenn: This just needs an approval - we've already passed 14 days on this one.
<nigel> Nigel: OK, interesting we don't have a class that corresponds to these.
<nigel> Glenn: Not in the spec - in TTV we have an IsTimedElement that does that, so implementations
<nigel> .. have to do it. I'm loathe to add another class just for this purpose. A definition should
<nigel> .. suffice.
<nigel> Nigel: Okay, I'll review.
<nigel> .. There are 16 uses of "timed element" in the spec.
<nigel> Glenn: I just noticed that, I'll update to add links to it.
<nigel> Nigel: Since we refer to this before, was it deemed to be an obvious concept or did we
<nigel> .. inherit it from SMIL?
<nigel> Glenn: I don't recall inheriting it from SMIL, but our usage would be different anyway.
<nigel> Cyril: Timed Element is a concept in SMIL I think.
<nigel> Glenn: It could be but the glossary section is very weak. In any case now that we have
<nigel> .. introduced timed element we should link those 16 places back to the definition now that
<nigel> .. we've added a term.
<nigel> Nigel: +1
<nigel> Nigel: Notices we should take care with 12.4
<nigel> Glenn: Yes
<nigel> Nigel: Aside from that, I think this looks good.
<nigel> SUMMARY: @skynavga to update to include references to the timed element term, then review to continue.

[skynavga]

@nigelmegitt implemented actions from SUMMARY above; should be good to go

[nigelmegitt]

Looks good to me.