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[role module] is 'must take Curie values' a problem for WAI-ARIA embedding in HTML? (PR#8041)

From: <Alfred.S.Gilman@IEEE.org>
Date: Tue, 17 Jun 2008 07:49:08 -0500
Message-Id: <200806171249.m5HCn8RX018605@htmlwg.mn.aptest.com>
To: public-xhtml2@w3.org
CC: xhtml2-issues@mn.aptest.com


[re-send.  Originally mis-posted as
http://lists.w3.org/Archives/Public/www-html/2008Jun/0003.html
   -Al ]


Re: http://www.w3.org/TR/2008/WD-xhtml-role-20080407/

This is a personal comment.  It is a concern about a possible problem,
not the assertion of a sure problem.

WAI-ARIA has a dependency on the role attribute module, or at least
has a dependency on the host language affording a suitable @role  
attribute
for which our roles are attribute values.

The Role Attribute module has been relaxed to allow a variety of ways
that the @role attribute is introduced into a host language or document.

But it appears to require that in any host language the  
implementation of this
attribute takes as its value

<quote
cite="http://www.w3.org/TR/2008/WD-xhtml-role-20080407/ 
#s_role_module_attributes">

  one or more whitespace separated CURIEs
</quote>
[CURIE] http://www.w3.org/TR/2008/WD-xhtml-role-20080407/#ref_CURIE

Curies are new and progressing down the Rec track behind the Role  
Attribute
Module.  This would seem to be in reverse of the dependency-induced  
order
as the Role Attribute has a dependency in this way on Curies.

In addition, because of the way that WAI-ARIA roles adjust element  
semantics,
role values carry a connotation of language extension; and Curies  
expand to
URIs which could indicate totally uncoordinated, crowd-sourced  
distributed
language extension.

The latter could be regarded as undesirable for the maintenance of  
HTML, the
central format of the One Web.

I am unclear how much saying that @role is a list of Curies means  
that the
processor must process in accordance with the URIs that the Curies  
abbreviate.

It would seem to me that WAI-ARIA needs host languages to respect the  
@role values
set out in the http://www.w3.org/1999/xhtml/vocab# vocabulary when  
these values
appear un-prefixed as tokens (items in the space-separated list) in  
the @role value.
What WAI-ARIA may need in terms of support for role extension is not  
known at this
time.  We have a working decision that role extension will not be  
addressed in
WAI-ARIA 1.0.

In that sense, ARIA has a dependency on @role but does not need @role  
to have
the dependency on Curies.  And there is a chance that cross-host- 
language support
for @role could be impeded by the dependency on curies.

That's my nervousness.  We will be talking about this more as we work  
to tighten up
the WAI-ARIA specification as it deals with host language insertion.   
But I
was told to put it on record as a Last Call comment for the Role  
Attribute Module
because it touches that specification which is already s/in/past it's  
second
Last Call.

Thanks,

Al
/me
Received on Tuesday, 17 June 2008 12:51:26 GMT

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