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ISSUE-315 (Maximum number of regions should be a processor constraint): Maximum number of regions should be a processor constraint [TTML IMSC 1.0]

From: Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Wed, 21 May 2014 13:40:24 +0000
Message-Id: <E1Wn6kq-0000Wt-Sp@shauna.w3.org>
To: public-tt@w3.org
ISSUE-315 (Maximum number of regions should be a processor constraint): Maximum number of regions should be a processor constraint [TTML IMSC 1.0]

http://www.w3.org/AudioVideo/TT/tracker/issues/315

Raised by: Nigel Megitt
On product: TTML IMSC 1.0

The requirement in ยง4.6.3 [1] to limit the number of presented regions in a given intermediate synchronic document should be expressed as a minimal processing constraint rather than a maximal document constraint in order not to limit future expansion. Example wording:

Presentation processors SHALL be able to present 4 or more regions within any given intermediate synchronic document.


This would permit sub-profiling of IMSC in other environments such that more than 4 regions are permitted within an intermediate synchronic document if a use case for that should arise, while still ensuring that all documents authored to meet the maximum of 4 regions constraint can be successfully processed.

[1] http://www.w3.org/TR/ttml-imsc1/#maximum-number
Received on Wednesday, 21 May 2014 13:40:25 UTC

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