RE: Types of units (was: RE: 2.4.2 Issues)

Thank you, Yvette! This is very helpful.

Loretta Guarino Reid
lguarino@adobe.com
Adobe Systems, Acrobat Engineering 

> -----Original Message-----
> From: public-wcag-teamb-request@w3.org [mailto:public-
> wcag-teamb-request@w3.org] On Behalf Of Yvette Hoitink
> Sent: Thursday, February 02, 2006 11:54 AM
> To: public-wcag-teamb@w3.org
> Subject: Types of units (was: RE: 2.4.2 Issues)
> 
> Hi everyone,
> 
> After the Dublin meeting I created a statechart to get my
> head around the
> different types of units (see attachment). This is the way
> I understood it
> then, but I might be wrong.
> 
> <longdesc>
> A unit starts its life as the result of the Authoring
> proces. The unit is
> then in a state called Authored unit. Server-side
> adaptations may transform
> authored units into new authored units. Only when it is
> served does an
> Authored unit become a Delivery unit. The delivery unit is
> what leaves the
> author-controlled environment and is served to the user-
> controlled
> environment. The user can now initiate additional
> adaptations to transform
> the delivery unit into another type of delivery unit (for
> example by adding
> acronym descriptions based on a user-controlled dictionary
> or even more
> exotic methods). Finally, the delivery unit is rendered by
> the user agent
> unto the perveived unit. The lifecycle of the unit ends
> with the perception
> of the unit.
> </longdesc>
> 
> In other words: the transformation of the delivery unit to
> the perceived
> unit is entirely outside the control of the author. The
> user can actively
> choose to transform the delivery unit, for example by
> invoking some third
> party tool to enhance the delivery units. The user agent
> renders the
> delivery unit which makes it a perceivable unit. For that
> reason, I don't
> think 'perceivable unit' is a useful term for WCAG because
> it's outside the
> author's control.
> 
> Yvette
> 
> 
> > -----Original Message-----
> > From: public-wcag-teamb-request@w3.org
> > [mailto:public-wcag-teamb-request@w3.org] On Behalf Of
> John M Slatin
> > Sent: donderdag 2 februari 2006 19:06
> > To: Loretta Guarino Reid; public-wcag-teamb@w3.org
> > Subject: RE: 2.4.2 Issues
> >
> >
> > The problem with "perceivable unit" (as I understand it)
> is
> > that authors can't control what happens when a single
> > delivery unit is rendered as multiple perceivable units,
> so
> > ther emight not be a way to satisfy the SC if we used
> David's
> > wording  .
> >
> > I'm not completely certain that I understand
> "perceivable unit"
> > properly. The term comes from the Device Independence
> WG's Glossary.
> > Could someone check it and se if we can determine
> whether
> > perceivable unit is or isn't under authorial contrl? (We
> may
> > also need to check with someone from DI WG to be sure on
> this one.)
> >
> > Thanks,
> > John
> >
> >
> >
> > "Good design is accessible design."
> > John Slatin, Ph.D.
> > Director, Accessibility Institute
> > University of Texas at Austin
> > FAC 248C
> > 1 University Station G9600
> > Austin, TX 78712
> > ph 512-495-4288, f 512-495-4524
> > email jslatin@mail.utexas.edu
> > web http://www.utexas.edu/research/accessibility/
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: public-wcag-teamb-request@w3.org
> > [mailto:public-wcag-teamb-request@w3.org] On Behalf Of
> > Loretta Guarino Reid
> > Sent: Thursday, February 02, 2006 8:50 am
> > To: public-wcag-teamb@w3.org
> > Subject: 2.4.2 Issues
> >
> >
> > 1. Issue 1825:
> > http://trace.wisc.edu/bugzilla_wcag/show_bug.cgi?id=1825
> >
> > Recommendation: Close this issue saying that 2.4.7 haw
> been
> > changed to remove "page or other".
> >
> > 2. Issue 1741
> > http://trace.wisc.edu/bugzilla_wcag/show_bug.cgi?id=1741
> >
> > Recommendation: adopt David Macdonald's proposal, which
> > clarifies that the SC only applies at the delivery unit
> level.
> >
> > <current>
> > 2.4.2 More than one way is available to locate content
> within
> > a set of delivery units where content is not the result
> of,
> > or a step in, a process or task. </current>
> >
> > <proposed>
> > 2.4.2 More than one way is available to locate each
> delivery
> > unit within a set of delivery units where the content of
> the
> > delivery unit is not the result of, or a step in, a
> process or task.
> > </proposed>
> >
> > More of the issue might be addressed if we used
> "perceivable unit"
> > instead of "delivery unit". Would there be problems if
> we change this
> > to:
> >
> > <proposed>
> > 2.4.2 More than one way is available to locate each
> > perceivable unit within a set of perceivable units where
> the
> > content of the perceivable unit is not the result of, or
> a
> > step in, a process or task.
> > </proposed>
> >
> >

Received on Friday, 3 February 2006 02:15:55 UTC