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RE: Conformance Section wtih Edits incorporated

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Sun, 14 Nov 2004 14:37:00 -0600
To: <jasonw@ariel.its.unimelb.edu.au>, "'Web Content Guidelines'" <w3c-wai-gl@w3.org>
Message-ID: <auto-000162099548@spamarrest.com>

I think this is good

The only change I would make is that the accessible version has to be the
"default" version (the one that is delivered if there is no content
negotiation or the user agent (or user) is not capable of content

Rationale:  Without this - a site could be inaccessible to everyone except
those that do content negotiation and users who know how to configure their
user agents to provide it.

I suggest that these changes be incorporated in the draft.

Others' thoughts?

 -- ------------------------------ 
Gregg C Vanderheiden Ph.D. 
Professor - Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 

-----Original Message-----
From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Jason White
Sent: Sunday, November 14, 2004 1:43 AM
To: Web Content Guidelines
Subject: Re: Conformance Section wtih Edits incorporated

Gregg Vanderheiden writes:
 > All conformance claims must include at least the following information: 
 > 1.      The version of the guidelines to which the conformance claim is
 > made.
 > 2.      The URI of the delivery unit for which the claim is being made.
2. A list of one or more URIs, or URI patterns, identifying the
delivery units of which the claim is made.

I also propose the following glossary definitions:

URI pattern: a regular expression identifying a set of resources. A
resource belongs to the set if the regular expression matches its URI.

Note: in order to be included in the set, the resource must exist; the
regular expression may, and typically will, match URIs that do not
refer to any existing resource.

Regular expression: a regular expression as defined in Appendix F of
XML Schema Part 2: Datatypes, Second Edition [insert proper reference

 > Editorial Note: There is some question as to whether URI is specific
 > a reference to the material for which the claim is being made.

I share the concern expressed in the note. In part, this depends on
the definition of "delivered unit", which hasn't been proposed as yet.
There are two dimensions of variability here which need to be

1. The information or functionality provided by a resource may vary
   over time, or according to parameters (e.g., database queries)
   supplied to the server. This type of variation I shall refer to as
   "different content provided by a resource", where "content"
   includes information and functionality.

2. Different versions of the same content (see item 1 above) may be
   provided by a resource, each adapted to a different delivery context.
Here, the
   content is the same but it is delivered in a different format or
   with different functional or presentational characteristics,
   depending on the delivery context.

I propose the following rules:

1. A resource conforms to WCAG 2.0 at a given conformance level only
   if all content provided by that resource so conforms.

2. Where the resource provides different versions of the same content,
   the content conforms to WCAG 2.0 only if at least one of the
   available versions satisfies all of the success criteria up to and
   including those at the specified conformance level.
Received on Sunday, 14 November 2004 20:37:06 UTC

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