[ttml2] Pull Request: Clarify use of TTML media type parameters (#1047).

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

== Clarify use of TTML media type parameters (#1047). ==
Closes #1047.

See https://github.com/w3c/ttml2/pull/1099

Received on Sunday, 26 May 2019 19:43:00 UTC