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:
- {agenda} TTWG Meeting 2016-10-20 (from nigel.megitt@bbc.co.uk on 2016-10-18)
- {minutes} TTWG Meeting 2016-10-13 (from nigel.megitt@bbc.co.uk on 2016-10-13)
- No Meeting today 12-09-13 (from Sean.Hayes@microsoft.com on 2013-09-12)
- Minutes for 05/09/13 (from nigel.megitt@bbc.co.uk on 2013-09-05)
- Agenda for 05/09/13 (from glenn@skynav.com on 2013-09-04)
- RE: TTML Agenda for 29/08/13 (from mdolan@newtbt.com on 2013-08-28)
- TTML Agenda for 29/08/13 (from glenn@skynav.com on 2013-08-28)
- Minutes - 2013-06-20 (from glenn@skynav.com on 2013-07-11)
- [minutes] Timed Text call June 20, 2013 (from plh@w3.org on 2013-06-27)
- Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
- TTML Agenda for 20/06/13 -- update -- (from Sean.Hayes@microsoft.com on 2013-06-19)
- Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-19)
- Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
- Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
- Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
- TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from Sean.Hayes@microsoft.com on 2013-06-17)
- TTWG Meeting Minutes Feb 7, 2013 (from momartin@microsoft.com on 2013-02-14)
- TTWG Meeting Minutes Feb 7, 2013 (from momartin@microsoft.com on 2013-02-07)
- TTML Agenda for 07/02/13 (from Sean.Hayes@microsoft.com on 2013-02-07)
- TTWG Meeting Minutes Jan 31, 2013 (from momartin@microsoft.com on 2013-02-06)
- TTML Agenda for 31/01/13 (from Sean.Hayes@microsoft.com on 2013-01-31)
- RE: TTML Agenda for 25/01/13 (from momartin@microsoft.com on 2013-01-24)
- TTML Agenda for 25/01/13 (from Sean.Hayes@microsoft.com on 2013-01-24)
- RE: TTML Agenda for 17/01/13 (from mdolan@newtbt.com on 2013-01-17)
- TTML Agenda for 17/01/13 (from Sean.Hayes@microsoft.com on 2013-01-17)
- TTWG Meeting Minutes Jan 10, 2013 (from momartin@microsoft.com on 2013-01-10)
- RE: TTML Agenda for 10/01/13 (from Sean.Hayes@microsoft.com on 2013-01-10)
- TTWG Minutes Dec 6, 2012 (from momartin@microsoft.com on 2012-12-12)
- TTWG Meeting Minutes Dec 6 (from momartin@microsoft.com on 2012-12-06)
- 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, 19:37:57TTWG Feb 14. Move to TTML v.next.
Monica Martin, 7 Feb 2013, 17:05:21I 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, 12:06:11No action required. Semantics already covered by XSL-FO (and CSS).
Glenn Adams, 25 Aug 2013, 01:00:32Display change log
