[ttml2] Add missing constraints on content profile feature prohibitions.

skynavga has just created a new issue for https://github.com/w3c/ttml2:

== Add missing constraints on content profile feature prohibitions. ==
In the definition of feature designators (E.1), need to make consistent use of language makes it an error for a content profile to require or permit a feature but prohibit a feature upon which the former feature depends (or implies).


Please view or discuss this issue at https://github.com/w3c/ttml2/issues/789 using your GitHub account

Received on Wednesday, 23 May 2018 21:41:54 UTC