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RE: Issue 357: Proposed revision to applicability provision

From: Hansen, Eric <ehansen@ets.org>
Date: Fri, 05 Jan 2001 14:56:21 -0500
To: "'Ian Jacobs'" <ij@w3.org>, w3c-wai-ua@w3.org
Message-id: <B49B36B1086DD41187DC000077893CFB8B468B@rosnt46.ets.org>
It seems like a reasonable improvement.

> -----Original Message-----
> From: Ian Jacobs [mailto:ij@w3.org]
> Sent: Friday, January 05, 2001 2:42 PM
> To: w3c-wai-ua@w3.org
> Subject: Issue 357: Proposed revision to applicability provision
> 
> 
> Hello,
> 
> Section 3.3 of the 29 December draft [1] includes the
> following applicability provision:
> 
>   "The checkpoint requires control of content properties 
>   (e.g., video or animation rate) that the subject of the claim
>   cannot control (e.g., the format does not allow it) 
>   or does not recognize (e.g., because the property is controlled
>   by a script in a manner that the subject of the claim 
>   cannot recognize)."
> 
> Recall that this applicability provision is here to cover
> cases such as the following:
> 
>  * Captions are "burned" into video.
>  * Streamed content that may not be rewindable
>  * Information embedded in scripts.
> 
> Al raised some concerns about this provision (issue 357), and
> I got an action item at the AOL ftf meeting to proposal a
> revision [2].
> 
> In discussions with Al, it became apparent that there might be
> two ways to interpret "the subject cannot control" properties
> of a format:
>  
>   1) The format forbids it (e.g., if you do this, you don't conform).
>   2) The format doesn't enable it (e.g., due to limits in the format).
> 
> I therefore propose to modify the applicability provision 
> to state more clearly that point (2) is intended:
> 
> <NEW>
>   "The checkpoint requires control of a content property
>    that the subject cannot recognize because of how the
>    content has been encoded in a particular format. Some
>    examples of this include: captioning information that
>    is "burned" into a video presentation and cannot be
>    recognized as captions per se, streamed content that
>    cannot be fast advanced or reversed, information
>    or relationships embedded in scripts in a manner that
>    cannot be recognized.
> </NEW>
> 
> This wording is consistent with the model that the user
> agent is responsible for what is encoded in the format
> (which may be less than what the author knows about
> the content).
> 
>  - Ian
> 
> [1] http://www.w3.org/WAI/UA/WD-UAAG10-20001229/#applicable
> [2] http://www.w3.org/WAI/UA/2000/11/minutes-20001116#issue-357
> -- 
> Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
> Tel:                         +1 831 457-2842
> Cell:                        +1 917 450-8783
> 
Received on Friday, 5 January 2001 14:56:59 GMT

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