[imsc] Pull Request: Define document conformance based on a valid abstract document instance

nigelmegitt has just submitted a new pull request for https://github.com/w3c/imsc:

== Define document conformance based on a valid abstract document instance ==
Ensures that the pruning algorithm in TTML2 section 4 is brought into play, to fix #425.

See https://github.com/w3c/imsc/pull/436

Received on Friday, 13 July 2018 16:26:51 UTC