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Re: BIG ISSUE -- re Delivery Units

From: Carlos A Velasco <Carlos.Velasco@fit.fraunhofer.de>
Date: Fri, 10 Feb 2006 14:32:26 +0100
Message-ID: <43EC95EA.6010007@fit.fraunhofer.de>
To: Gregg Vanderheiden <gv@trace.wisc.edu>
Cc: w3c-wai-gl@w3.org

Hi Gregg,

As a first remark, IMHO this WG shall run away from reinventing the 
wheel. I think that <http://www.w3.org/TR/di-gloss/> and the HTTP 
specification shall cover the needs of WCAG. If something is not clear 
from the DI stuff, then let us ask them, as Johannes did in the past. 
That said ...

Gregg Vanderheiden wrote:
> Johannes wrote:
>> Don't you define the "Web Unit" to be exactly this [Delivery unit]?
> 
> See the problem statement (below)
> 
> Each image is a DU
> Images can't meet the Guidelines on their own.

Why should they? They are images with no alternative text or 
description. Also I am sure you are aware that you can include metadata 
in several media formats (although I am not so sure whether they have a 
field for descriptions, nor that UAs can read them).

> Hence, as written - the guidelines cannot be met by any site or page that
> has an image on it.

Sorry, but that line of inference is not true. Guidelines are not met by 
"sites", they are met by sets of resources (or DUs, or whatever you end 
up calling them) that you must specify in any conformance claim. 
Otherwise, you may have to think/reuse a definition of "site" (or 
"hosts" or "domains") to apply WCAG 2.0 to them.

regards,
carlos

-- 
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 Friday, 10 February 2006 13:33:04 GMT

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