[ttml1] Pull Request: Add note re: semantics of circular actor references

palemieux has just submitted a new pull request for https://github.com/w3c/ttml1:

== Add note re: semantics of circular actor references ==
Close #201 

See https://github.com/w3c/ttml1/pull/287

Received on Wednesday, 13 December 2017 03:29:56 UTC