ISSUE-18: dur and end resolution


dur and end resolution

TTML 1.0
Raised by:
Philippe Le Hégaret
Opened on:
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 on 2009-01-26)

Related notes:

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David Singer <>, Nigel Megitt <>, Chairs, Thierry Michel <>, Philippe Le Hégaret <>, Atsushi Shimono <>, Staff Contacts
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