ISSUE-375: Use of the ebutts:linePadding and ebutts:multiRowAlign in IMSC 1

ebu-extensions-imsc

Use of the ebutts:linePadding and ebutts:multiRowAlign in IMSC 1

State:
CLOSED
Product:
TTML IMSC 1.0
Raised by:
Andreas Tai
Opened on:
2015-02-25
Description:
While in the EBU-TT-D spec, where the features #linePadding and #multiRowAlign are defined, the attributes ebutts:linePadding and ebutts:multiRowAlign can only be children of the tt:style element this is different in IMSC 1. EBU-TT-D does not allow "inline styling" but IMSC 1 does. Therefore both attributes should be allowed as attribute children of the tt:region element and content block level elements (tt:body, tt:div and tt:p). This should be added as information in section 7.4 of IMSC 1.



Related Actions Items:
Related emails:
  1. Second CR for IMSC1 (from pal@sandflow.com on 2015-05-04)
  2. April F2F Meeting minutes (from nigel.megitt@bbc.co.uk on 2015-04-22)
  3. {minutes} TTWG Meeting 2015-04-02 (from nigel.megitt@bbc.co.uk on 2015-04-02)
  4. Re: List of changes since the IMSC1 CR (from pal@sandflow.com on 2015-04-02)
  5. {agenda} TTWG Meeting 2015-04-02 (from nigel.megitt@bbc.co.uk on 2015-04-01)
  6. List of changes since the IMSC1 CR (from pal@sandflow.com on 2015-03-30)
  7. {minutes} TTWG Meeting 2015-03-26 (from nigel.megitt@bbc.co.uk on 2015-03-26)
  8. {minutes} TTWG Meeting 2015-02-26 (from nigel.megitt@bbc.co.uk on 2015-02-26)
  9. ISSUE-375: Use of the ebutts:linePadding and ebutts:multiRowAlign in IMSC 1 [TTML IMSC 1.0] (from sysbot+tracker@w3.org on 2015-02-25)

Related notes:

Addressed at https://dvcs.w3.org/hg/ttml/rev/188a78631c32

Pierre-Anthony Lemieux, 26 Feb 2015, 02:03:30

[nigel]: [meeting 2015-003-26] Andreas to propose some wording to make clear that ebutts:multiRowAlign applies only to tt:p and is inheritable.

26 Mar 2015, 14:49:19

Fixed at https://dvcs.w3.org/hg/ttml/rev/0e65be56b077

Pierre-Anthony Lemieux, 30 Mar 2015, 15:32:51

As the EBU Subtitle group confirmed that ebutts:multiRowAlign can only apply to tt:p and that the style attribute is inheritable the edit in https://dvcs.w3.org/hg/ttml/rev/0e65be56b077 resolves the issue.

Andreas Tai, 1 Apr 2015, 16:43:48

The following note (introduced in https://dvcs.w3.org/hg/ttml/rev/188a78631c32) in section 6.8.4 could possibly be ommited:

"[EBU-TT-D] specifies that the attributes ebutts:linePadding and ebutts:multiRowAlign can only be a children of the style element"

...or changed to

"In contrast to IMSC1 [EBU-TT-D] specifies that the attributes ebutts:linePadding and ebutts:multiRowAlign can only be specified on the style element"

Reasoning:

Users who not are not to familiar with TTML "language" may assume that IMSC is as restrictive as EBU-TT-D. The feature definition in IMSC says:

"A transformation processor supports the #multiRowAlign feature if it recognizes and is capable of transforming values of the ebutts:multiRowAlign attribute specified in [EBU-TT-D]."


So it may be clearer to either use the same terminology as in the extension provision ("specified on" instead of "children of") or to leave the note out.

Andreas Tai, 1 Apr 2015, 16:57:29

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