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RE: RELATED ISSUE AUTHORED UNIT

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Thu, 9 Feb 2006 11:04:51 -0600
To: "'Bailey, Bruce'" <Bruce.Bailey@ed.gov>, <w3c-wai-gl@w3.org>
Message-ID: <00a801c62d9a$f1236500$ee8cfea9@NC6000BAK>
Bruce B wrote

> I am fairly certain that some of the references below are meant to be
perceivable unit and not delivery unity. 

GV: We decided that can't  have any guidelines that refer to perceivable
unit - because that is outside of the control of the  author.   User agents
may group or separate or even divide up a page or group of pages. 

 

 

 

Bruce B wrote 

> 2.4.4 (as proposed):  Web Units have titles.

>Is only one title required per Web Unit?

GV: Yes - the jpg's do not have to have titles.  There is in fact no way to
put a title on a jpg file.  The jpg file is a delivery unit but is not a Web
Unit.

Sometimes a Web Unit is a page, sometimes it is only part of a page?

GV: A part of a page is only a Web Unit if it is intended to be refenced as
a unit in itself (as evidenced for example by having links to it on the
site) and not part of a Web Unit. 

Sometimes a Web Unit is a Delivery Unit, sometimes it is a Perceivable Unit?

GV:  A Web Unit is always a Delivery Unit (but not vice versa).  It is never
a perceivable unit.  Perceivable units are created from Web Unit by the user
agent. 

 

RE perceivable units in guidelines - see other posting.  Can't use
perceivable units in guidelines because they are out of author control.

 

RE your definition of structure    I like it

Structure:
1.      The way the parts of content are organized in relation to each other
and;
2.      The way content is organized.

GV: I like it.  We should consider it.  Hmmmm.  Looking at it closer I'm not
sure I understand the difference between 1 and 2. 

Can you explain? Or suggest better wording for #2 so it is clear?  

 


Gregg

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

 

 


  _____  


From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Bailey, Bruce
Sent: Thursday, February 09, 2006 8:03 AM
To: w3c-wai-gl@w3.org
Subject: RE: RELATED ISSUE AUTHORED UNIT

I am fairly certain that some of the references below are meant to be
perceivable unit and not delivery unity.  I am still not clear in the
difference in meaning between the (current) perceivable unit and the
(proposed) web unit.

 

Consider a "web page" consisting of a couple or three frames.  Obviously,
this constitutes a single Web Unit.  I think it also constitutes a single
perceivable unit.  How then, does an SC like 2.4.4 make sense with the new
term?

 

2.4.4 (as proposed):  Web Units have titles.

 

Is only one title required per Web Unit?

Sometimes a Web Unit is a page, sometimes it is only part of a page?

Sometimes a Web Unit is a Delivery Unit, sometimes it is a Perceivable Unit?

 

I suspect that replacing some instances of Delivery Unit in the SC with
Perceivable Unit will eliminate much of the confusion.  Some of those can
even be replaced with just "content".  Mind you, I am no fan of the whole
authored/delivery/perceivable unit vernacular, but Web Unit seems to
introduce as many problems as it solves, and it is almost as opaque.

 

I still like:

 

Structure:
1.      The way the parts of content are organized in relation to each other
and;
2.      The way content is organized.

 

-----Original Message-----
From: Gregg Vanderheiden [mailto:gv@trace.wisc.edu]
Sent: Wednesday, February 08, 2006 11:45 PM
To: Bailey, Bruce; w3c-wai-gl@w3.org
Subject: RE: RELATED ISSUE AUTHORED UNIT

No 

 

If you download a page - the page is a D U.  But every image on the page is
also a D U.  

 

With the Web Unit - only the page is a W U.   

 

This is important because most of our guidelines where we say  D U  cannot
be met by most Delivery Units.   So we can use Delivery Unit as currently
defined and we can't re-define it.  

 


Gregg

 


  _____  


From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Bailey, Bruce
Sent: Wednesday, February 08, 2006 8:06 PM
To: w3c-wai-gl@w3.org
Subject: RE: RELATED ISSUE AUTHORED UNIT

Isn't the (old) "perceivable unit" the same thing that is meant by (new) Web
Unit?  As per Gregg's note earlier today, the only SC that uses perceivable
unit is 2.4.3.  Both delivery unit and perceivable unit are used to define
content however.

The simple term "content" works well in the definition of structure (below).


-----Original Message-----
From:   w3c-wai-gl-request@w3.org on behalf of Gregg Vanderheiden
Sent:   Wed 2/8/2006 4:36 PM
To:     w3c-wai-gl@w3.org
Cc:    
Subject:        RELATED ISSUE   AUTHORED UNIT

The only place we use AUTHORED UNIT is in the definition of Structure

structure

1.      The way the parts of an authored
<http://www.w3.org/WAI/GL/WCAG20/appendixA.html#authored-unitdef>  unit are
organized in relation to each other and;

2.      The way a collection of authored units is organized in relation to a
delivery unit and;

3.      The way a collection of delivery
<http://www.w3.org/WAI/GL/WCAG20/appendixA.html#deliveryunitdef>  units is
organized

Suggest that we change this definition to

structure

1.      The way the parts of an Web Unit are organized in relation to each
other and;

2.      The way a collection of Web units is organized.

(If we use a term other than Web Unit - substitute the new word for Web Unit
above. ) 
Received on Thursday, 9 February 2006 17:04:59 GMT

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