[TTML] survey: TTML document merging

All,


Context
=======

At our F2F in Santa Clara [1] I presented change proposal 25 [2]
[attachment] concerning how to merge TTML content documents, the
constraints on those documents to allow them to be merged, the constraints
on the merge process itself and a root level parameter attribute that can
be used to disambiguate documents from different combinable groups.

There were three main points from my perspective arising from the
discussion of this proposal:

1. I am not the only person who has identified the requirement for merging
documents. (cf Cyril's point that concatenated TTML files from an MP4 file
should result in a combined document)
2. More consideration was needed for merging mixed content elements.
3. We do not currently have consensus to include this application within
TTML2.

Regarding point 2, I have updated [1] to define how to handle mixed
content in which character data is interspersed with elements.

To include this transformation scenario within TTML 2 (or any other
Recommendation) we would need to establish consensus that it is
appropriate to standardise it. Alternatives would be to publish it as a
working group Note, for example, or to approach standardisation
independently via a member submission, or not to publish it at all.


Survey
======

To proceed with this I have 2 questions:

Q1: Do you have use case(s) for this functionality, either listed so far
or not? (if so, what?)


Q2: Please indicate your current level of preference for each of the
following five options:
a) inclusion in TTML 2,
b) inclusion in TTML v.next,
c) publication as a Working Group Note,
d) submission for inclusion as a deliverable in a possible future Charter,
e) no W3C publication of any sort.

using the fractional scale -1 to +1 where -1 is the only option equivalent
to a formal 'I couldn't live with this' objection, 0 means 'no
preference', +1 means 'support' and intermediate values reflect
intermediate levels of support.

I would like to add this as an agenda topic to our meeting on Thursday
20th November, so please respond by end of Wednesday 19th November.



References
==========

[1] http://www.w3.org/2014/10/27-tt-minutes.html#item17

[2] https://www.w3.org/wiki/TTML/changeProposal025