Hi,
At 04:37 6/05/2008, you wrote:
>At 10:56 AM 6/05/2008, Liddy Nevile wrote:
>>Tom... re the CSS idea:
>>
>> >Would there be value in using the CSS media types?
>> >http://www.w3.org/TR/REC-CSS2/media.html#media-types > ...
>>I am not sure if you mean using these for definitions? ...
>
>The idea would be that AURAL indicates content for speech
>synthesizers, BRAILLE for braille content and so on. These terms as
>they are already standardized by W3C and are likely to be applied to
>web based material, so it might make sense to use them in the vocabulary.
If matching vocabulary is important to you, then you should know that
CSS 2.1 (currently Candidate Recommendation) removed the "aural"
media type from the list of recognized media types at
<http://www.w3.org/TR/CSS21/media.html#media-types>, declared "aural"
deprecated, and moved the complete "Aural Style Sheets" chapter into
a non-normative appendix: <http://www.w3.org/TR/CSS21/aural.html>.
"Aural" was replaced with "speech".
For CSS 3, there has been work on a speech module
<http://www.w3.org/TR/css3-speech/> (latest version is from 2004) and
aural style sheets <http://www.w3.org/Style/CSS/current-work#aural>
(only available to W3C members).
This is the description for "CSS Aural Style Sheets Level 3":
<quote>
Many primarily visual devices are in fact capable of making sound as
well, sometimes even of very high quality. In CSS3 those multimedia
capabilities will be available to designers. The audio module
contains properties for attaching background sounds to elements and
sound effects to state transitions, such as link activation or
"hovering" over an element. Expected possibilities include overlaying
multiple sounds, positioning a sound left or right in stereo space
and playing a sound in a loop.
</quote>
This is the description for "CSS Speech Level 3":
<quote>
Speech contains properties to specify how a document is rendered by a
speech synthesizer: volume, voice, speed, pitch, cues, pauses, etc.
There was already an ACSS (Aural CSS) module in CSS2, but it was
never correctly implemented and it was not compatible with the Speech
Synthesis Markup Language (SSML), W3C's language for controling
speech synthesizers. The ACSS module of CSS2 has therefore been split
in two parts: speech (for actual speech, compatible with SSML) and
audio (for sound effects on other devices). The speech properties in
CSS3 will be similar to those in CSS2, but have different values.
(The old properties can still be used with the deprecated 'aural'
media type, but the new ones should be used inside the new 'speech'
medium, as well as in style sheets for 'all' media.)
</quote>
Based on this, the CSS speech media type is the better match for the
"synthesized" type in the AfA vocabulary.
But this type of style sheet would only adapt the default speech
synthesis according to certain parameters, rather than making it
possible in the first place. In this respect, the attempt to find
matching CSS media types for AfA vocabulary may be a red herring.
Just my 2 (euro)cents.
Best regards,
Christophe
>I teach the use of the CSS media type to my web design students as
>at the ANU (mostly for hand held and print devices)
><http://www.tomw.net.au/2008/wd/>. However, I have to admit they are
>not used much in practice.
>
>ps: Am off to a conference in Malaysia next week, then Turkey and
>Greece. If there is anyone interested in accessibility, particularly
>for the web, I should visit along the way, please let me know.
>
>
>
>Tom Worthington FACS HLM [log in to unmask] Ph: 0419 496150
>Director, Tomw Communications Pty Ltd ABN: 17 088 714 309
>PO Box 13, Belconnen ACT 2617 http://www.tomw.net.au/
>Adjunct Senior Lecturer, ANU
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Christophe Strobbe
K.U.Leuven - Dept. of Electrical Engineering - SCD
Research Group on Document Architectures
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