Re: Objections to TPAC resolutions on IMSC1.1

I don't agree that it is existing practice – it is the exception rather than the rule and we are clearly trying hard as a group to bridge the gaps rather than make new ones. The main difference that we are bound to continue with is the use of different syntax.

Notably, most of the new styling features introduced in TTML2 are in fact derived from CSS semantics.

Nigel


From: David Singer <singer@mac.com<mailto:singer@mac.com>>
Date: Tuesday, 28 November 2017 at 01:49
To: Glenn Adams <glenn@skynav.com<mailto:glenn@skynav.com>>
Cc: Pierre-Anthony Lemieux <pal@sandflow.com<mailto:pal@sandflow.com>>, Nigel Megitt <nigel.megitt@bbc.co.uk<mailto:nigel.megitt@bbc.co.uk>>, TTWG <public-tt@w3.org<mailto:public-tt@w3.org>>
Subject: Re: Objections to TPAC resolutions on IMSC1.1

Thank you for confirming both that this is existing practice and that we need to stop diverging from the web community.

Dave Singer (iPhone)

On Nov 27, 2017, at 17:37, Glenn Adams <glenn@skynav.com<mailto:glenn@skynav.com>> wrote:



On Mon, Nov 27, 2017 at 5:18 PM, David Singer <singer@mac.com<mailto:singer@mac.com>> wrote:


> On Nov 27, 2017, at 10:45 , Glenn Adams <glenn@skynav.com<mailto:glenn@skynav.com>> wrote:
>
> Given that such an addition to CSS would require years to obtain in a REC, it is entirely impractical to use this rationale with TTML2 (and probably TTML3).
>

I read this, perhaps wrongly (and if so, please correct me) that the timed text group can, and should, invent styling mechanisms that are different from, or absent from, CSS, because they can move faster.  If this is what you mean, I disagree in almost every respect, and in particular, if something is needed for styling text in general, it belongs in CSS.  *Only* if the styling is caption-specific and irrelevant in all other contexts, should the captioning language invent new styling.

Since this (invent styling mechanisms as needed) is the status quo for this group and for TTML in particular, what you suggest is a departure from existing practice, and not the other way around.


David Singer

singer@mac.com<mailto:singer@mac.com>