[ttml2] Erroneous designation of #region-timing as mandatory.

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

== Erroneous designation of #region-timing as mandatory. ==
It should be marked as optional, as indicated in the ttml2-{presentation,transformation}.xml profile definition documents.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/767 using your GitHub account

Received on Thursday, 17 May 2018 21:51:14 UTC