Re: ISSUE-268 (nigel): Purpose of new draft wording in 12.2.1 is unclear [TTML 1.0]

On Mon, Aug 12, 2013 at 9:35 AM, Nigel Megitt <nigel.megitt@bbc.co.uk>wrote:

>  On 12/08/2013 16:27, "Glenn Adams" <glenn@skynav.com> wrote:
>
>
> On Mon, Aug 12, 2013 at 3:53 AM, Nigel Megitt <nigel.megitt@bbc.co.uk>wrote:
>
>>  Apologies, I agree significant is defined.
>>
>>  However, I don't understand why in 12.1.7 it is sufficient merely to
>> use the word significant to express this concept whereas in 12.2.1 it is
>> also clarified that the agent instances must appear in the same Document
>> Instance – surely this is a tautology, or if not the same qualification
>> applies in both 12.1.1 and 12.1.7. It may be clearer to move the 'in the
>> same Document instance' phrasing to the definition of significant in 12.1.5.
>>
>
>  You are correct that the new clarification implies the same Document
> Instance. The latter language, about the same Document Instance, preceded
> the new clarification about referencing a "significant" agent, and when I
> made the new clarification, I felt that it didn't invalidate the
> pre-existing language, and that it wouldn't hurt to leave it in.
>
>  If you think it better to do so, I could remove the the "same Document
> Instance" language, which would be more correct than propagating this old
> language to 12.1.5.
>
>
>  I think removing it would improve consistency and reduce the risk that
> some unintended distinction is inferred later due to the small difference.
> I'm not proposing that we should propagate the old language to 12.1.5.
>

ok, i'll remove


>
>>
>>   On 09/08/2013 17:44, "Glenn Adams" <glenn@skynav.com> wrote:
>>
>>   Not a bug. See 12.1.5 for meaning of "significant" in this context:
>>
>>  A ttm:agent metadata item is considered to be significant only when
>> specified as a child of the head element or as a child of a metadata element
>> child of the head element.
>>
>>
>> On Fri, Aug 9, 2013 at 5:30 AM, Timed Text Working Group Issue Tracker <
>> sysbot+tracker@w3.org> wrote:
>>
>>> ISSUE-268 (nigel): Purpose of new draft wording in 12.2.1 is unclear
>>> [TTML 1.0]
>>>
>>> http://www.w3.org/AudioVideo/TT/tracker/issues/268
>>>
>>> Raised by: Nigel Megitt
>>> On product: TTML 1.0
>>>
>>> The edit to 12.2.1 described in
>>> https://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttml-changes.html#change-history-per-to-rec-23section 1.1 adds the word "significant" into the sentence:
>>>
>>> If specified, a ttm:agent attribute must reference significant ttm:agent
>>> element instances that appear as a descendent of the same Document Instance
>>> as that of the referring element.
>>>
>>> The intended additional meaning introduced by this edit is unclear. The
>>> text already says that the referenced agent must appear within the
>>> document, and there are restricted locations where it can be. I propose
>>> either reverting the edit or adding text to explain what distinguishes a
>>> "significant" agent from any other kind.
>>>
>>>
>>>
>>>
>>>
>
>
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