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RE: BIG ISSUE -- re Delivery Units

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Fri, 10 Feb 2006 00:19:48 -0600
To: "'Bailey, Bruce'" <Bruce.Bailey@ed.gov>, <w3c-wai-gl@w3.org>
Message-ID: <003001c62e0a$003aec10$ee8cfea9@NC6000BAK>
A perceivable unit is unknown.   A cell phone may break a delivery unit up
into several perceivable units.   Different browsers may present very
different renderings of a delivery unit.    So we aren't using perceivable
units at all.  (did have one but it is now gone).


If the parts of a frame are not intended to be viewed separately then they
are not Web Units.   


Yes - content is a global term for what we are talking about.  It is not
specific as you point out.  



 -- ------------------------------ 
Gregg C Vanderheiden Ph.D. 
Professor - Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 
The Player for my DSS sound file is at http://tinyurl.com/dho6b




From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Bailey, Bruce
Sent: Thursday, February 09, 2006 7:47 PM
To: w3c-wai-gl@w3.org
Subject: RE: BIG ISSUE -- re Delivery Units

> Hi Bruce

Thank you Gregg for your patient efforts with remedial vocabulary lessons.

> Here is the DI group definition of perceivable unit

I have been referencing the DI terms from the WCAG2 glossary.  That hasn't
helped much.

> You have it at the wrong end of the chain.

Okay, so sometimes (e.g., a PDF file) a Delivery Unit contains multiple
Perceivable Units (e.g., pages), other times (e.g., a web page with images)
a Perceivable Unit contains multiple Delivery Units.  Are you satisfied that
Web Unit avoids this conundrum?  How about my example of a frame based web
"page"?  Each frame is a Web Unit (so each can have a title), but the whole
bundle (web quote page unquote) is also a Web Unit?

The term content has similar issues.  Sometimes content is just part of a
web page, content refers to a whole page or web application, sometimes
content refers to a collection of pages or a whole site.

By the way, is a Perceivable Unit only that which fits into a widow (without
scrolling) at any given time?  Again, I am hoping such a question is moot,
at least with regard to WCAG 2.0.
Received on Friday, 10 February 2006 06:20:12 UTC

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