[ttml2] Pull Request: Clarify note on [validate document] (#1036).

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

== Clarify note on [validate document] (#1036). ==
Closes #1036.

See https://github.com/w3c/ttml2/pull/1052

Received on Monday, 25 March 2019 22:24:26 UTC