[ttml2] Pull Request: Update description of vocabulary additions (#658).

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

== Update description of vocabulary additions (#658). ==
Closes #658.

See https://github.com/w3c/ttml2/pull/671

Received on Monday, 19 February 2018 04:23:26 UTC