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Re: ISSUE-330 (Is Presented Region a synonym for temporally active region?): Is Presented Region a synonym for temporally active region? [TTML IMSC 1.0]

From: Pierre-Anthony Lemieux <pal@sandflow.com>
Date: Tue, 12 Aug 2014 16:51:11 +0200
Message-ID: <CAF_7JxC7-5iq3Dh92oLyJ8v9f4_6+zRRdvod=+FNiu7ik84sXQ@mail.gmail.com>
To: Nigel Megitt <nigel.megitt@bbc.co.uk>
Cc: Glenn Adams <glenn@skynav.com>, Timed Text Working Group <public-tt@w3.org>
Addressed at https://dvcs.w3.org/hg/ttml/rev/ceaa219bfbcc .


-- Pierre

On Mon, Jul 28, 2014 at 5:55 PM, Nigel Megitt <nigel.megitt@bbc.co.uk> wrote:
> Thanks for the clarification Glenn. I've added a note to ISSUE-330 which
> I'll quote to save clicks:
> "In that case it would make sense to define 'presented region' in terms of a
> 'temporally active region' that either contains visible content with opacity
>>0 or has showBackground="always" and a backgroundColour with opacity >0."
> Nigel
> On 28/07/2014 16:41, "Glenn Adams" <glenn@skynav.com> wrote:
> No, temporally active region and presented region are not synonymous.
> Further, showBackground="whenActive" does not mean "when temporally active",
> rather it means "when temporally active and has content selected into it".
> As such it is a bit of a misnomer, but we adopted the name from SMIL and
> repurposed it to our ends.
> See my additional comments in Issues 314 and 330.
> On Mon, Jul 28, 2014 at 6:56 AM, Timed Text Working Group Issue Tracker
> <sysbot+tracker@w3.org> wrote:
>> ISSUE-330 (Is Presented Region a synonym for temporally active region?):
>> Is Presented Region a synonym for temporally active region? [TTML IMSC 1.0]
>> http://www.w3.org/AudioVideo/TT/tracker/issues/330
>> Raised by: Nigel Megitt
>> On product: TTML IMSC 1.0
>> This issue is related to Issue-314 and was generated as part of the
>> resolution to Issue-313.
>> TTML 1 SE §9.3.2 [1] uses the term "temporally active region" to define
>> regions that are included in the construction of intermediate synchronic
>> documents "for the purposes of performing presentation processing".
>> Issue-314 covers the point that this term is not defined.
>> [1] http://www.w3.org/TR/ttml1/#semantics-region-layout-step-1
>> IMSC 1 editor's draft §4.6.1 [2] defines and uses the term "presented
>> region" to define regions that may be presented at any moment, and in all
>> but one case references presented region with respect to an intermediate
>> synchronic document.
>> [2]
>> https://dvcs.w3.org/hg/ttml/raw-file/tip/ttml-ww-profiles/ttml-ww-profiles.html#presented-region
>> It looks as though these two terms may be synonyms, or very closely
>> related to each other. If this is the case then IMSC 1 should reference the
>> defined term in TTML 1 SE (if need be, after the resolution to Issue-314).
>> If it is not the case then the difference should be clarified making
>> reference to the similar concept.
>> For example, if the resolution to Issue-314 is to define temporally active
>> region in TTML 1 SE as any region that is either temporally active or has
>> content selected into it that is temporally active, or has
>> showBackground="always", then Presented Region in IMSC 1 may be defined as:
>>    any temporally active region which satisfies all of the following
>> conditions...,
>>    where those conditions include [those currently specified] and those
>> noted additionally by Glenn in response to Issue-313 [3], i.e. the values of
>> the attributes tts:display, tts:visibility, tts:extent and tts:opacity are
>> such that marks may be made by the region or its contents.
>> [3] http://lists.w3.org/Archives/Public/public-tt/2014Jul/0036.html
>> This issue created as per Action-308.
Received on Tuesday, 12 August 2014 14:52:04 UTC

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