Re: [Issue 521] Requirements involving "all" formats

This is a good clarification to the document.
Jon


At 02:06 PM 5/27/2002 -0400, you wrote:
>Hello all,
>
>At the 11 April 2002 teleconference [1], I took an action
>regarding issue 521 [2] to identify checkpoints whose
>requirements apply independent of formats that are part of the
>conformance claim.
>
>I propose that for the following checkpoints (reference UAAG 1.0
>12 Sep 2001 draft [3]), the format requirements apply as follows:
>
>   3.1 Toggle background images: Applies for all image formats.
>   3.2 Toggle audio, video, animated images: Applies for
>       all audio, video, and animated image formats.
>   3.3 Toggle animated/blinking text: Applies to all formats.
>   3.7 Toggle images. Applies to all image formats.
>   4.9 Global volume control. Applies to all audio formats.
>
>I tried to come up with a model that would allow me to choose
>some checkpoints and not others, but I couldn't come up with
>anything satisfying. One feature of the above checkpoints is that
>I think it's possible to recognize images, audio, etc. by content
>type, independent of format details.
>
>Proposed changes to the specification:
>
>  1) Indicate at the beginning of the section on conformance that
>  a user agent doesn't have to satisfy the checkpoints for EVERY
>  implemented format, only those that are part of the conformance
>  claim with the following exceptions:
>
>     - If the conformance claim includes the VisualText
>       content type label, the user agent must satisfy
>       3.3 for all formats.
>     - If the conformance claim includes the Image content
>       type label, the user agent must satisfy 3.1 and 3.7 for
>       all image formats.
>     - If the conformance claim includes one of the Audio, Video,
>       or Animation  content type labels, the user agent must
>       satisfy 3.2 for all audio, video, or animation formats,
>       respectively.
>     - If the conformance claim includes the Audio
>       content type label, the user agent must satisfy
>       4.9 for all sources of audio.
>
>  3) Update the relevant content type label defintions with the
>     same information.
>
>Note: I thought that it might be useful to modify the checkpoints
>themselves to say "for all image formats" etc. Upon
>experimentation, I find that it makes the checkpoints unduly
>complicated.
>
>  - Ian
>
>[1] http://lists.w3.org/Archives/Public/w3c-wai-ua/2002AprJun/0049
>[2] http://www.w3.org/WAI/UA/issues/issues-linear-cr2#521
>[3] http://www.w3.org/TR/2001/CR-UAAG10-20010912/
>
>--
>Ian Jacobs ([email protected])   http://www.w3.org/People/Jacobs
>Tel:                     +1 718 260-9447

Jon Gunderson, Ph.D., ATP
Coordinator of Assistive Communication and Information Technology
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