[imsc] Clarify that the constraint on `#extent-region` does not require region elements to exist (#469)

• From: Nigel Megitt via GitHub <sysbot+gh@w3.org>
• Date: Wed, 23 Jan 2019 21:30:41 +0000
• To: public-tt@w3.org
• Message-ID: <issues.opened-402438173-1548279040-sysbot+gh@w3.org>

nigelmegitt has just created a new issue for https://github.com/w3c/imsc:

== Clarify that the constraint on `#extent-region` does not require region elements to exist ==
The constraint in §8.4.2 `#extent-region` that `tts:extent` shall be present on all `region` elements makes no statement about the default region, which of course has no corresponding `region` element. It may be worth clarifying that the constraint does not in and of itself require that `region `elements are present in the document instance, and that the constraint in any case would not apply to the default region where the equivalent extent would be `"100% 100%"` by definition.

Please view or discuss this issue at https://github.com/w3c/imsc/issues/469 using your GitHub account

Received on Wednesday, 23 January 2019 21:30:42 UTC