ISSUE-173: presentation semantics of control characters and other unmapped characters

presentation semantics of control characters and other unmapped characters

State:
CLOSED
Product:
TTML2
Raised by:
Glenn Adams
Opened on:
2012-08-08
Description:
it is unclear what the presentation semantics of control and other unmapped characters should be with respect to background color, default glyph, etc.; need to check if this is handled (indirectly) by XSL-FO semantics or not, and if not, then add some guidance and possibly normative text
Related Actions Items:
No related actions
Related emails:
  1. No Meeting today 12-09-13 (from Sean.Hayes@microsoft.com on 2013-09-12)
  2. Minutes for 05/09/13 (from nigel.megitt@bbc.co.uk on 2013-09-05)
  3. Agenda for 05/09/13 (from glenn@skynav.com on 2013-09-04)
  4. RE: TTML Agenda for 29/08/13 (from mdolan@newtbt.com on 2013-08-28)
  5. TTML Agenda for 29/08/13 (from glenn@skynav.com on 2013-08-28)
  6. Minutes - 2013-06-20 (from glenn@skynav.com on 2013-07-11)
  7. [minutes] Timed Text call June 20, 2013 (from plh@w3.org on 2013-06-27)
  8. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
  9. TTML Agenda for 20/06/13 -- update -- (from Sean.Hayes@microsoft.com on 2013-06-19)
  10. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-19)
  11. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
  12. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
  13. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
  14. TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from Sean.Hayes@microsoft.com on 2013-06-17)
  15. TTWG Meeting Minutes Feb 7, 2013 (from momartin@microsoft.com on 2013-02-14)
  16. TTWG Meeting Minutes Feb 7, 2013 (from momartin@microsoft.com on 2013-02-07)
  17. TTML Agenda for 07/02/13 (from Sean.Hayes@microsoft.com on 2013-02-07)
  18. TTWG Meeting Minutes Jan 31, 2013 (from momartin@microsoft.com on 2013-02-06)
  19. TTML Agenda for 31/01/13 (from Sean.Hayes@microsoft.com on 2013-01-31)
  20. RE: TTML Agenda for 25/01/13 (from momartin@microsoft.com on 2013-01-24)
  21. TTML Agenda for 25/01/13 (from Sean.Hayes@microsoft.com on 2013-01-24)
  22. RE: TTML Agenda for 17/01/13 (from mdolan@newtbt.com on 2013-01-17)
  23. TTML Agenda for 17/01/13 (from Sean.Hayes@microsoft.com on 2013-01-17)
  24. TTWG Meeting Minutes Jan 10, 2013 (from momartin@microsoft.com on 2013-01-10)
  25. RE: TTML Agenda for 10/01/13 (from Sean.Hayes@microsoft.com on 2013-01-10)
  26. TTWG Minutes Dec 6, 2012 (from momartin@microsoft.com on 2012-12-12)
  27. TTWG Meeting Minutes Dec 6 (from momartin@microsoft.com on 2012-12-06)
  28. ISSUE-173: presentation semantics of control characters and other unmapped characters [DFXP 1.0] (from sysbot+tracker@w3.org on 2012-08-08)

Related notes:

TTWG Oct 25: http://www.w3.org/2012/10/25-tt-minutes.html. Discussion - TTML 1.0 needs clarification. Defer as TTML 1.1 issue.

Monica Martin, 30 Oct 2012, 19:37:57

TTWG Feb 14. Move to TTML v.next.

Monica Martin, 7 Feb 2013, 17:05:21

I believe this is indeed handled by XSL:FO. Essentially only the glyph areas created for characters designated as white space by XML (ie (#x20 | #x9 | #xD | #xA) get deleted when building line and glyph (see 4.7.2 Line-building part 6). Otherwise the glyph is taken from the nominal-font (which could be a system font) and will display the 'missing char' representation from that font if no explicit glyph is provided. (see section 5.5.7 Font Properties, Section 7.9.3 "font-selection-strategy")

Sean Hayes, 14 Jun 2013, 12:06:11

No action required. Semantics already covered by XSL-FO (and CSS).

Glenn Adams, 25 Aug 2013, 01:00:32

Changelog:

Created issue 'presentation semantics of control characters and other unmapped characters' nickname owned by Glenn Adams on product DFXP 1.0, description 'it is unclear what the presentation semantics of control and other unmapped characters should be with respect to background color, default glyph, etc.; need to check if this is handled (indirectly) by XSL-FO semantics or not, and if not, then add some guidance and possibly normative text' non-public

Glenn Adams, 8 Aug 2012, 01:42:58

Status changed to 'open'

Monica Martin, 6 Sep 2012, 14:50:44

Product changed to TTML.next

Monica Martin, 7 Feb 2013, 15:45:25

Status changed to 'pending review'

Sean Hayes, 14 Jun 2013, 12:06:11

Status changed to 'open'

Philippe Le Hégaret, 20 Jun 2013, 14:38:49

Status changed to 'pending review'

Glenn Adams, 25 Aug 2013, 01:00:32

Status changed to 'closed'

5 Sep 2013, 14:19:15


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