ACTION-14: - work with Canvas sub-group on tactile and braille media types/groups proposal for CSS WG

misnumbered action item in emessage cross-posted in fulfilment of action-14:
* http://lists.w3.org/Archives/Public/public-canvas-api/2010JanMar/0131.html
* http://lists.w3.org/Archives/Public/public-html-a11y/2010Jan/0285.html

---- PROPOSAL ARISING FROM COMPLETION OF THIS ACTION ITEM ----
tactile is defined as "capable of, allows for being touched"

tactual is defined as "arising from or due to touch";

this definition of "tactual" corresponds with my previous definition of
tactile media, which -- in order to differentiate it from braille -- i
defined as material perceived by the sense of touch which requires no
prior knowledge in order to be correctly perceived; having researched the
meaning of the terms "tactile" and "tactual", i have concluded that
"tactual" is the term which best expresses the difference between tactual
media (which is intended to be conveyed via touch, but which requires no
previous knowledge and does not represent a natural language), and
braille, which is a tactile representation of a specific natural language
(as well as specific natural language instances if the braille device
being used supports natural language switching on-the-fly);

CONCLUSION:

"tactile" covers both braile and tactual media, as both convey
information through the sense of touch;

therefore, i am proposing that:

1) CSS retain the media group "tactile";
2) CSS add a new media type, "tactual",