{minutes} TTWG Meeting 2017-03-02

Thanks all for attending today's slightly curtailed meeting (and for being prompt at the beginning).

Minutes can be found in HTML format at https://www.w3.org/2017/03/02-tt-minutes.html

Please note that we will be extending the remaining meetings in March to 2 hours and beginning them at 10am Boston time. Also please check your diaries because DST comes into operation in March, earlier in the US than in Europe.

Those minutes in text format:


   [1]W3C

      [1] http://www.w3.org/

                Timed Text Working Group Teleconference

02 Mar 2017

   See also: [2]IRC log

      [2] http://www.w3.org/2017/03/02-tt-irc

Attendees

   Present
          Dae, Glenn, Nigel, Pierre, Thierry, Andreas, Mike

   Regrets
          None

   Chair
          Nigel

   Scribe
          Nigel

Contents

     * [3]Topics
         1. [4]This Meeting
         2. [5]Meetings times
         3. [6]IMSC
         4. [7]TTML
     * [8]Summary of Action Items
     * [9]Summary of Resolutions
     __________________________________________________________

   <scribe> Scribe: Nigel

This Meeting

   Nigel: Today, we have a proposal on meeting times, one IMSC
   issue and some TTML issues.
   ... Any other topics to cover?

   Andreas: I'd like to cover the pull request on TTML1.

Meetings times

   Dae: I think there's enough to talk about between now and the
   end of the month I propose
   ... to start "early", at 10am Boston time, so we can have
   longer meetings.

   Nigel: By the way, DST comes in, in the US, soon, and at the
   end of March in Europe.

   Thierry: I believe it is on the 12th in the US and the 26th in
   Europe.
   ... So there is an impact in Europe, but we are back in sync
   after March 12th.

   Nigel: Dae, I think this is a good suggestion.

   Andreas: It's fine for me to start an hour earlier but I cannot
   allocate 2 hours to the meeting, however this is not a problem
   if you go ahead.

   Nigel: Okay as Chair I'm going to make the call and say we will
   do this, begin at 10am Boston and set a duration of 2 hours for
   all the remaining meetings in March.

IMSC

   [10]foreign namespace usage is underspecified

     [10] https://github.com/w3c/imsc/issues/213

   Mike: Regarding the example of smpte:information my view is
   that it is an error in the
   ... SMPTE-TT spec, and it should say "descendant" of the head
   element, with the intent that
   ... it be made a child of the `metadata` element under `head`.

   Glenn: The reason we put `metadata` everywhere was to support
   the addition of foreign
   ... namespace data, with the exception of the `tt` element on
   the basis that such metadata
   ... could be placed under `head/metadata`.
   ... It is a bit indirect but if you follow through TTML1 from
   §3 to §4 to §5 the foreign
   ... namespace elements _are_ pruned because their names are not
   present in the abstract
   ... document type.

   Nigel: That's an argument contrary to my reading, but I can
   accept that.

   Andreas: That matches my understanding too.

   group: [seems to have consensus that foreign namespace elements
   are prohibited in TTML1 except as children of metadata]

   Nigel: My concern for the concrete encoding in IMSC1 is that we
   may prohibit the addition
   ... of vocabulary that is orthogonal to processing defined in
   TTML and IMSC and that may
   ... prevent some useful use cases.

   Mike: It seems like an arbitrary syntactical restriction since
   foreign namespace attributes
   ... are allowed - why allow attributes but not elements?

   Glenn: That was a deliberate choice to avoid putting TTML
   namespace elements as children
   ... of foreign namespace elements.
   ... A clarification may be useful in TTML1 and possibly a
   normative statement in TTML2 would be advisable.

   Nigel: Is everyone except me here comfortable with prohibiting
   foreign namespace elements in IMSC1 but permitting foreign
   namespace attributes?

   Mike: I don't want to add further restrictions but I think that
   is what TTML1 says today.
   ... I want to be crystal clear in IMSC1, and then we can take
   up the question in TTML1 and TTML2.

   group: Consensus to clarify in IMSC 1 that TTML1 permits
   foreign namespace elements only in tt:metadata and attributes
   everywhere, §6.2 of IMSC1.

   Pierre: There's already a note referring to structural elements
   of TTML1, so it could be an
   ... extension to that. We may want to go further, or stay
   silent, I'm not sure which yet.

   Nigel: Who will take this action?

   Pierre: I will do this, and check in with Mike before posting
   as a PR.

   Mike: I'm relieved of the action from last week.

TTML

   Dae: If anyone is concerned that we cannot meet the TTML2 WR
   deadline please raise any
   ... issues that will block us from getting there.

   Pierre: Movielabs' position is that all issues have to be
   resolved before by WR, either by closing or deferring them.
   ... So a priori it means every issue that has not been assigned
   by consensus to TTML.next.

   Dae: For example the issues raised by i18n review.

   Pierre: I think anyone in the group can take a stab at
   resolving those issues.
   ... There are some that Movielabs has stronger opinions on but
   in general it is not possible
   ... to defer them en masse.

   Nigel: The horizontal review comments should not be ignored but
   we may be able to address
   ... them after WR and before CR.

   Pierre: I agree with that.

   Nigel: I need to run now but the point is made Dae that we have
   issues to cover.

   Dae: We should focus on the ones that are not 'easy' first.

   Glenn: I don't intend to address the HR comments before WR by
   the way, so we need to
   ... discuss what to do about those if there is not consensus on
   that.

   Nigel: Thanks everyone. [adjourns meeting]

Summary of Action Items

Summary of Resolutions

   [End of minutes]
     __________________________________________________________


    Minutes formatted by David Booth's [11]scribe.perl version
    1.152 ([12]CVS log)
    $Date: 2017/03/02 18:40:30 $

     [11] http://dev.w3.org/cvsweb/~checkout~/2002/scribe/scribedoc.htm
     [12] http://dev.w3.org/cvsweb/2002/scribe/