ISSUE-358: Add identifier support for related ordered sequences of documents

Sequence support

Add identifier support for related ordered sequences of documents

State:
OPEN
Product:
TTML2
Raised by:
Nigel Megitt
Opened on:
2014-12-10
Description:
In an authoring environment that creates an ordered sequence of TTML documents that collectively form some kind of coherent representation collectively, such as a sequence of documents created 'live', it is useful to be able to identify at the root level, i.e. with minimal parsing requirements, that:

1. A collection of documents belongs to the same sequence and
2. The relative ordering of a document within the sequence.

This also relates to Change Proposal 25 and Issue-288, and the proposal made in the November TPAC meeting.

Modified proposal now includes a sequence number:

Metadata attribute ttm:sequenceIdentifier
Considered significant on tt:tt only.
Optional attribute.
Type xs:string
Description: The ttm:sequenceIdentifier metadata attribute can be used to distinguish between sequences of documents where the documents within a sequence are related to each other but there is not necessarily any relationship between different sequences.

Metadata attribute ttm:sequenceNumber
Considered significant on tt:tt only.
Optional attribute.
Type xs:positiveInteger
Description: The ttm:sequenceNumber metadata attribute can be used to sort documents with the same sequenceIdentifier into a defined order. Two documents with the same sequenceIdentifier SHOULD NOT have the same sequenceNumber, if sequenceNumber is used.



Note that this proposal mirrors work happening in EBU but is my proposal and not an EBU proposal, for the avoidance of doubt.
Related Actions Items:
No related actions
Related emails:
  1. Re: ISSUE-358 (Sequence support): Add identifier support for related ordered sequences of documents [TTML2] (from glenn@skynav.com on 2014-12-11)
  2. Re: {agenda} TTWG Meeting 2014-12-11 (from nigel.megitt@bbc.co.uk on 2014-12-11)
  3. Re: ISSUE-358 (Sequence support): Add identifier support for related ordered sequences of documents [TTML2] (from nigel.megitt@bbc.co.uk on 2014-12-11)
  4. Re: ISSUE-358 (Sequence support): Add identifier support for related ordered sequences of documents [TTML2] (from glenn@skynav.com on 2014-12-10)
  5. {agenda} TTWG Meeting 2014-12-11 (from nigel.megitt@bbc.co.uk on 2014-12-10)
  6. ISSUE-358 (Sequence support): Add identifier support for related ordered sequences of documents [TTML2] (from sysbot+tracker@w3.org on 2014-12-10)

Related notes:

It seems confusing to have both sequence identifier and sequence number. Why not one only? For example, choose one of these and require values to be unique over a sequence of related documents.

Glenn Adams, 14 Jan 2015, 15:56:04

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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>, Staff Contacts
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