ISSUE-315: Maximum number of regions should be a processor constraint

Maximum number of regions should be a processor constraint

Maximum number of regions should be a processor constraint

State:
OPEN
Product:
TTML IMSC 2.0
Raised by:
Nigel Megitt
Opened on:
2014-05-21
Description:
The requirement in §4.6.3 [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

This may require a processor profile to be created for IMSC1, as noted as a possibility in ISSUE-307.
Related Actions Items:
No related actions
Related emails:
  1. {agenda} TTWG Meeting 25/9/2014 (from nigel.megitt@bbc.co.uk on 2014-09-24)
  2. Re: {agenda} TTWG Meeting 11/9/2014 (from glenn@skynav.com on 2014-09-10)
  3. {agenda} TTWG Meeting 11/9/2014 (from nigel.megitt@bbc.co.uk on 2014-09-10)
  4. {agenda} TTWG Meeting 4/9/2014 (from nigel.megitt@bbc.co.uk on 2014-09-03)
  5. {agenda} TTWG Meeting 21/8/2014 (from nigel.megitt@bbc.co.uk on 2014-08-20)
  6. Re: New Change Proposal 28 on IMSC 1: Profile refactoring (from nigel.megitt@bbc.co.uk on 2014-08-14)
  7. Re: New Change Proposal 28 on IMSC 1: Profile refactoring (from pal@sandflow.com on 2014-08-14)
  8. {agenda} TTWG Meeting 14/8/2014 (from nigel.megitt@bbc.co.uk on 2014-08-13)
  9. New Change Proposal 28 on IMSC 1: Profile refactoring (from nigel.megitt@bbc.co.uk on 2014-08-08)
  10. Re: {agenda} TTWG Meeting 7/8/2014 (from pal@sandflow.com on 2014-08-06)
  11. {agenda} TTWG Meeting 7/8/2014 (from nigel.megitt@bbc.co.uk on 2014-08-06)
  12. {agenda} TTWG Meeting 31/7/2014 (from nigel.megitt@bbc.co.uk on 2014-07-30)
  13. {minutes} TTWG Meeting 19/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-19)
  14. RE: {agenda} TTWG Meeting 19/6/2014 (from mdolan@newtbt.com on 2014-06-18)
  15. {agenda} TTWG Meeting 19/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-18)
  16. IMSC feature designators (from nigel.megitt@bbc.co.uk on 2014-06-13)
  17. RE: {agenda} TTWG Meeting 12/6/2014 (from mdolan@newtbt.com on 2014-06-12)
  18. Re: {agenda} TTWG Meeting 12/6/2014 (from pal@sandflow.com on 2014-06-11)
  19. Re: {agenda} TTWG Meeting 12/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-11)
  20. Re: {agenda} TTWG Meeting 12/6/2014 (from pal@sandflow.com on 2014-06-11)
  21. Re: {agenda} TTWG Meeting 12/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-11)
  22. {agenda} TTWG Meeting 12/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-11)
  23. RE: {agenda} TTWG Meeting 5/6/2014 (from mdolan@newtbt.com on 2014-06-04)
  24. {agenda} TTWG Meeting 5/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-04)
  25. {agenda} TTWG Meeting 29/5/2014 (from nigel.megitt@bbc.co.uk on 2014-05-28)
  26. {agenda} TTWG Meeting 22/5/2014 (from nigel.megitt@bbc.co.uk on 2014-05-21)
  27. 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 sysbot+tracker@w3.org on 2014-05-21)

Related notes:

document (content) and processor constraints should be separated here, and they can be distinct numbers; e.g., one could define a content profile that limits the number of regions expressed in any given ISD, while at the same time defining a processor profile that requires support for a minimum number of regions in an ISD, and the numbers could be different;

Glenn Adams, 23 May 2014, 23:26:38

I've added a suggested feature designator for this along with those for the HRM in Issue-319.

Nigel Megitt, 13 Jun 2014, 16:38:49

See also Change Proposal 28 [1].

[1] https://www.w3.org/wiki/TTML/changeProposal028

Nigel Megitt, 8 Aug 2014, 13:27:11

This issue is non-blocking on the CR publication. However it is dependent on defining the processor profile, which is not done in IMSC 1 and not available in combination with the content profile in TTML1. Deferring this issue to IMSC 2.

Nigel Megitt, 28 Nov 2014, 15:55:58

(NB CP28 was withdrawn on 2014-09-05)

Nigel Megitt, 28 Nov 2014, 15:56:16

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David Singer <singer@apple.com>, Nigel Megitt <nigel.megitt@bbc.co.uk>, Chairs, Thierry Michel <tmichel@w3.org>, Philippe Le Hégaret <plh@w3.org>, Atsushi Shimono <atsushi@w3.org>, Staff Contacts
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