ISSUE-197: charset/encoding unconstrained

charset/encoding unconstrained

State:

CLOSED

Product:

TTML 1.0

Raised by:

Mike Dolan

Opened on:

2012-11-29

Description:

TTML is silent on the document charset (xml encoding) permitted. Since the core XML specification permits virtually anything, then TTML is also unconstrained. Certain encodings, such as "binary" are generally non-interoperable. Further, since we permit other namespaces, constraints on those should also be required. For example, even if TTML is constrained to utf-8 and utf-16, then allowing other namespaces to use binary would make the document using such namespaces unparseable.

XML decoders are only required to support utf-8 and utf-16. Propose we so constrain TTML.

Related to Issue-196: https://www.w3.org/AudioVideo/TT/tracker/issues/196
Related to Action-131: https://www.w3.org/AudioVideo/TT/tracker/actions/131
Related to Action-129: https://www.w3.org/AudioVideo/TT/tracker/actions/129

Related Actions Items:

• ACTION-136 on Glenn Adams to Integrate changes from Action-133 into the TTML 1.0 Second Edition - due 2013-01-14, closed
• ACTION-166 on Mike Dolan to Open issue for 1.1 regarding encodings - due 2013-06-27, closed

Related emails:

1. [Minutes] TTWG telecon 08/08/2013 (from tmichel@w3.org on 2013-08-08)
2. Minutes - 2013-06-20 (from glenn@skynav.com on 2013-07-11)
3. [minutes] Timed Text call June 20, 2013 (from plh@w3.org on 2013-06-27)
4. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
5. TTML Agenda for 20/06/13 -- update -- (from Sean.Hayes@microsoft.com on 2013-06-19)
6. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-19)
7. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
8. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
9. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
10. TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from Sean.Hayes@microsoft.com on 2013-06-17)
11. TTWG Agenda March 7, 2013 (from momartin@microsoft.com on 2013-03-07)
12. Re: TTML Agenda for 28/2/13 (from glenn@skynav.com on 2013-02-28)
13. RE: TTML Agenda for 28/2/13 (from mdolan@newtbt.com on 2013-02-28)
14. TTML Agenda for 28/2/13 (from momartin@microsoft.com on 2013-02-28)
15. TTML Agenda for 21/02/13 (from Sean.Hayes@microsoft.com on 2013-02-21)
16. TTML Agenda for 14/02/13 (from Sean.Hayes@microsoft.com on 2013-02-14)
17. TTML Agenda for 07/02/13 (from Sean.Hayes@microsoft.com on 2013-02-07)
18. TTML Agenda for 31/01/13 (from Sean.Hayes@microsoft.com on 2013-01-31)
19. RE: TTML Agenda for 25/01/13 (from momartin@microsoft.com on 2013-01-24)
20. TTML Agenda for 25/01/13 (from Sean.Hayes@microsoft.com on 2013-01-24)
21. RE: TTML Agenda for 17/01/13 (from mdolan@newtbt.com on 2013-01-17)
22. TTML Agenda for 17/01/13 (from Sean.Hayes@microsoft.com on 2013-01-17)
23. TTWG Meeting Minutes Jan 10, 2013 (from momartin@microsoft.com on 2013-01-10)
24. RE: TTML Agenda for 10/01/13 (from Sean.Hayes@microsoft.com on 2013-01-10)
25. ISSUE-197: charset/encoding unconstrained [DFXP 1.0] (from sysbot+tracker@w3.org on 2012-11-29)

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