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

On 12/08/2013 16:27, "Glenn Adams" <glenn@skynav.com<mailto:glenn@skynav.com>> wrote:


On Mon, Aug 12, 2013 at 3:53 AM, Nigel Megitt <nigel.megitt@bbc.co.uk<mailto: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.






On 09/08/2013 17:44, "Glenn Adams" <glenn@skynav.com<mailto: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<mailto: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-23 section 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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