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RE: [Issue 673] Proposed definitions for text, Unicode, non-text content (without typos)

From: Richard Ishida <ishida@w3.org>
Date: Thu, 9 Sep 2004 17:13:09 +0100
To: <wendy@w3.org>, "'wai-gl'" <w3c-wai-gl@w3.org>
Cc: "'Martin Duerst'" <duerst@w3.org>
Message-Id: <20040909161315.641EB4EF90@homer.w3.org>

Hi Wendy,

> -----Original Message-----
> From: w3c-wai-gl-request@w3.org 
> [mailto:w3c-wai-gl-request@w3.org] On Behalf Of Wendy Chisholm
> Sent: 09 September 2004 00:58
> To: wai-gl
> Cc: Richard Ishida; Martin Duerst
> Subject: [Issue 673] Proposed definitions for text, Unicode, 
> non-text content (without typos)
> 
> 
> Proposed definitions to address issue 673 [1]. Notes and 
> references at [2].  These definitions are not perfect, but 
> lay the basis for tomorrow's teleconference discussion about 
> Unicode and text.
> 
> text
> A sequence of characters included in the Unicode character 
> set. Refer to Characters [3] in Extensible Markup Language 
> (XML) 1.0 (Third Edition) for more specific information about 
> the accepted character range.

Do you need to define the accepted character range?  If so, note that the
range is different for instance for XML 1.1.  

> 
> Unicode
> In this document, we use "Unicode" to refer to the Unicode 
> character set and not the character encoding.

s/the character encoding/a character encoding
There are at least three possible encodings for Unicode, UTF-8/16/32.

> (@@ the Unicode character set may be encoded in ASCII, UTF-8, 

ASCII ?

> 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? @@link to Unicode
> spec?)


Does this help?
http://wwww.w3.org/International/tutorials/tutorial-char-enc/#defn1 see
"Character sets, coded character sets, and encodings"


> 
> 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 1.1, 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 .
> 

hth
RI


> [1] <http://trace.wisc.edu/bugzilla_wcag/show_bug.cgi?id=673>
> [2] <http://www.w3.org/2004/09/wcag-unicode.html>
> [3] <http://w3.org/TR/2004/REC-xml-20040204/#charsets>
> --
> wendy a chisholm
> world wide web consortium
> web accessibility initiative
> http://www.w3.org/WAI/
> /--
> 
> 
> 
Received on Thursday, 9 September 2004 16:13:17 UTC

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