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RE: [Issue 673] Proposed definitions for text, Unicode, non-text content

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Thu, 9 Sep 2004 08:01:11 -0500
To: <wendy@w3.org>, "'wai-gl'" <w3c-wai-gl@w3.org>
Cc: "'Richard Ishida'" <ishida@w3.org>, "'Martin Duerst'" <duerst@w3.org>
Message-ID: <auto-000088238048@spamarrest.com>

Very nice,

One possible issue is that ASCII art sounds like it could be represented by
a sequence of unicode characters - since it is a sequence of ASCII

Any way we could tweak the definition to avoid this seeming contradiction?

Otherwise this looks like a very nice set of definitions on first read.  

Martin - I'm not sure I follow all of your comments.  We will be discussing
tomorrow.  Could you add a couple sentences to your post to make it a bit
clearer what you mean - why - and what you think the final wording should

Thanks very much

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

-----Original Message-----
From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Wendy Chisholm
Sent: Wednesday, September 08, 2004 6:49 PM
To: wai-gl
Cc: Richard Ishida; Martin Duerst
Subject: [Issue 673] Proposed definitions for text, Unicode, non-text

Proposed definitions to address issue 673 [1]. Notes and references at 
[2].  These are not perfect, but lay the basis for tomorrow's 

A sequence of characters included in the Unicode character set. Refer to 
Characters in Extensible Markup Language (XML) 1.0 (Third Edition) for 
more specific information about the accepted character range.

In this document, we use "Unicode" to refer to the Unicode character set 
and not the character encoding (the Unicode character set may be encoded 
in ASCII, UTF-8, UTF-16, etc. characters in the Unicode set can be 
created with numeric character references - so there is a clear 
separation between the character encoding and those characters defined 
in the unicode character set that we consider "text"- @@provide 
reference to I18N list?)

non-text content
Non-text content is content that can not be represented by a Unicode 
character or sequence of unicode characters. Non-text content includes 
but is not limited to
* images and graphics,
* sound clips, movies, and animations,
* ASCII art (which may use several unicode characters to create an image)
Providing text alternatives for non-text content is addressed in 
Guideline 1.2, providing captions and audio descriptions of multimedia 
is addressed in guideline 1.2, and interacting with non-text content via 
scripts, applets, and programmatic objects is addressed in guideline 4.2 .

[1] <http://trace.wisc.edu/bugzilla_wcag/show_bug.cgi?id=673>
[2] <http://www.w3.org/2004/09/wcag-unicode.html>

wendy a chisholm
world wide web consortium
web accessibility initiative
Received on Thursday, 9 September 2004 13:01:42 UTC

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