ISSUE-18: dur and end resolution

@dur@end

dur and end resolution

State:
CLOSED
Product:
TTML 1.0
Raised by:
Philippe Le Hégaret
Opened on:
2008-12-05
Description:
SMIL has elaborate rules for computing time spans, however in order to simplify timed text processing some constraints are imposed by dfxp which can lead to unexpected results if no time attributes are specified.

A seq element is defined to have a simple duration of indefinite, rather than based on the active duration of its children, thus at last one of dur or end should be defined on a seq to limit its simple duration.

Should we add a validity constraint to require:
a) require either dur or end on seq
b) prevent using both dur and end on the same element?

Related Actions Items:
Related emails:
  1. [minutes] teleconference 20090123 (from plh@w3.org on 2009-01-26)

Related notes:

No additional notes.

Changelog:

Created issue 'dur and end resolution' nickname @dur@end owned by Philippe Le Hégaret on product , description 'SMIL has elaborate rules for computing time spans, however in order to simplify timed text processing it is proposed to disallow specifying both dur and end on the same element.

Should we add a validity constraint to prevent using both dur and end on the same element?
' non-public

Philippe Le Hégaret, 5 Dec 2008, 20:11:52

Product changed to DFXP 1.0

Philippe Le Hégaret, 5 Dec 2008, 20:13:52

Description changed to 'SMIL has elaborate rules for computing time spans, however in order to simplify timed text processing some constraints are imposed by dfxp which can lead to unexpected results if no time attributes are specified.

A seq element is defined to have a simple duration of indefinite, rather than based on the active duration of its children, thus at last one of dur or end should be defined on a seq to limit its simple duration.

Should we add a validity constraint to require:
a) require either dur or end on seq
b) prevent using both dur and end on the same element?

'

Sean Hayes, 13 Dec 2008, 17:09:53

Status changed to 'closed'

Philippe Le Hégaret, 23 Jan 2009, 16:24:32


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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