Re: IMSC1 and profile designator

Hi all,

ISSUE-448 [1] have been filed.

[1] https://www.w3.org/AudioVideo/TT/tracker/issues/448

Best,

-- Pierre

On Thu, Oct 8, 2015 at 7:24 AM, Glenn Adams <glenn@skynav.com> wrote:
>
> On Thu, Oct 8, 2015 at 2:08 AM, Nigel Megitt <nigel.megitt@bbc.co.uk> wrote:
>>
>> In ยง 6.1 it is stated that the #profile feature MAY be used. I take this
>> to mean that it is permitted to specify a ttp:profile attribute on the
>> tt:tt element but not required. There's no suggestion of including the
>> ttp:profile attribute within a document in a different location to what is
>> defined in TTML1SE.
>
>
> Unfortunately, the way that IMSC is specified, i.e., in terms of whether a
> feature may be used or not, doesn't translate very well to guidance about
> actual authoring. In this case, the #profile feature covers quite a bit of
> functionality beyond @ttp:profile, and doesn't by itself address the
> presence or absence of this attribute.
>
> I do see the following notes under 7.1 and 8.1:
>
> "As specified in 6.10 Features, the presence of the ttp:profile attribute is
> not required by this profile. The profile designator specified above is
> intended to be generally used to signal conformance of a Document Instance
> to the profile. The details of such signaling depends on the application,
> and can, for instance, use metadata structures out-of-band of the Document
> Instance."
>
> For TTV support of IMSC1, we plan to emit a warning by default if no
> @ttp:profile is specified. I would like to see IMSC1 updated to specify that
> this profile SHOULD be specified. Whether it is specified or not is
> independent of whether a processor supports the #profile feature as defined.
>
>>
>>
>> Since the same principle of extension as in TTML1SE applies, it is also
>> legal (but out of scope of the specification) to include the
>> ebuttm:conformsToStandard element but strict processors can ignore it.
>>
>> Kind regards,
>>
>> Nigel
>>
>>
>> On 08/10/2015 08:56, "Cyril Concolato"
>> <cyril.concolato@telecom-paristech.fr> wrote:
>>
>> >Hi,
>> >
>> >Reading IMSC1, it is unclear where the defined profile designators
>> >should be used? In particular it says "the presence of the ttp:profile
>> >attribute is not required by this profile." Why not? Where should it be
>> >used? Is there an equivalent to ebutt:conformsToStandard to use them?
>> >
>> >Regards,
>> >Cyril
>> >
>> >--
>> >Cyril Concolato
>> >Multimedia Group / Telecom ParisTech
>> >http://concolato.wp.mines-telecom.fr/
>> >@cconcolato
>> >
>> >
>>
>

Received on Thursday, 8 October 2015 14:33:38 UTC