[ttml2] Pull Request: Constrain ttp:profile's @use attribute (#1029).

skynavga has just submitted a new pull request for https://github.com/w3c/ttml2:

== Constrain ttp:profile's @use attribute (#1029). ==
Closes #1029.

See https://github.com/w3c/ttml2/pull/1137

Received on Friday, 2 August 2019 23:48:08 UTC