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Spec clarification (temporal addressing)

From: DENOUAL Franck <Franck.Denoual@crf.canon.fr>
Date: Wed, 8 Jun 2011 10:52:18 +0200
To: "public-media-fragment@w3.org" <public-media-fragment@w3.org>
Message-ID: <1337E6FD97CF8845A4C949F24AACFC460D35A9172A@Nina.crf.canon.fr>
Dear media fragmenters,

I have one comment on current MF URI specification draft:
In section 4.2.1 Temporal Dimension [1], you indicate that "t=10," (with comma at the end) leads to interval [10, end).
It seems that the ABNF grammar just below does not allow this since it is the whole pattern ["," npttime] that is optional in npttimedef definition.
Moreover in your test cases [2], you propose to consider "t=3," as invalid syntax.
I think there is a need for clarification here.

Another remark: the sentence "If a single number only is given, this is the begin time" is in contradiction with the example 3 lines below "t=,20" where the only given number corresponds to end time. 
Suggestion for rephrasing: "If a single number only is given, this corresponds to the begin time except if it is preceded by a comma that would in this case indicate the end time". 

Best regards,

[1] http://www.w3.org/2008/WebVideo/Fragments/WD-media-fragments-spec/#naming-time
[2] http://www.w3.org/2008/WebVideo/Fragments/TC/ua-test-cases#TC0012-UA 
Received on Wednesday, 8 June 2011 08:53:02 UTC

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