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Re: Why an standalone image shall conform to WCAG 2.0? (was Re: BIG ISSUE -- re Delivery Units)

From: Carlos A Velasco <Carlos.Velasco@fit.fraunhofer.de>
Date: Mon, 13 Feb 2006 20:46:13 +0100
Message-ID: <43F0E205.5090509@fit.fraunhofer.de>
To: Gregg Vanderheiden <gv@trace.wisc.edu>
Cc: w3c-wai-gl@w3.org

Hi Gregg,

Without looking at any SC in particular, the conformance statement shall
read (under the K.I.S.S. principle):

<old text>
Conformance Notes

A delivery unit conforms to WCAG 2.0 at a given conformance level only
if all content provided by that delivery unit conforms at that level.

Note: If multiple representations can be retrieved from a URI through
content negotiation, then the conformance claim would be for the
delivery unit that is returned when no negotiation is conducted (unless
the server returns an error for that condition, in which case one of the
negotiated forms must comply).
</old text>

Conformance Notes

Conformance claims are expressed in terms of delivery units [REF]. DUs
are considered as a whole entity. The fact that a DU is conformant at a
given level does not imply that all its components are individually
conformant at that level.

Note: If multiple representations can be retrieved from a URI through
HTTP content negotiation [1], then the conformance claim must specify
the necessary Request Headers to which the claim applies.

In regard to the difficulty of this effort, see my next email.


[1] http://www.w3.org/Protocols/rfc2616/rfc2616-sec12.html#sec12

Gregg Vanderheiden wrote:
> How so?
> How do you fix the problem in the SC with a change to the conformance
> statement?

Dr Carlos A Velasco - http://access.fit.fraunhofer.de/
Fraunhofer-Institut für Angewandte Informationstechnik FIT
  [Fraunhofer Institute for Applied Information Technology (FIT)]
  Barrierefreie Informations- und Kommunikationstechnologie für Alle
  Schloss Birlinghoven, D53757 Sankt Augustin (Germany)
  Tel: +49-2241-142609 Fax: +49-2241-1442609
Received on Monday, 13 February 2006 19:46:29 UTC

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