- From: Al Gilman <asgilman@iamdigex.net>
- Date: Tue, 25 Jun 2002 11:17:22 -0400
- To: Charles McCathieNevile <charles@w3.org>, Katie Haritos-Shea <ryladog@earthlink.net>
- Cc: "_W3C WAI WCAG (GL)" <w3c-wai-gl@w3.org>, 3WC WAI X-TECH <wai-xtech@w3.org>
At 08:39 PM 2002-06-23, Charles McCathieNevile wrote: >Yep, I think Katie has captured an important distinction. > >chaals > >On Thu, 20 Jun 2002, Katie Haritos-Shea wrote: > > > I am cross posting because this is a WCAG 2.0 definition that needs some > work....... > Currently in the latest WCAG 2.0 Draft "time-dependent presentation" is > defined as below...... > > <qoute> > > Definitions (informative) > time-dependent presentation > > (1)A time-dependent presentation is a presentation which > is composed of synchronized audio and visual tracks (e.g., a movie), George Kercher calls it 'temporal' content. Yes, 'presentation' is too display-smelling if you want to include the case of time-dependent action opportunities. <proposal> Time-dependent content is content where the sense [or more generally operational effectiveness] of the content depends in some way on time differences as they are realized in the actual, concrete user interaction with the content. Time-dependent content is sensitive to the time-flow fidelity of its realization in the delivery context. Audio and video streams, and time-limited promotional pricing are examples of time-dependent content. A synchronized bundle of time-dependent components such as a SMIL presentation may be regarded as one time-dependent content object, if the user perceives all the concurrent phenomena as part of an integrated experience relating to a common time interval such that time-coincidence is significant. Playback time and nominal playback time need not be exactly one to one, but distortion of the inter-component synchronization or playback rate beyond some limit may degrade or destroy the comprehensibility or operability of the content when it is time-dependent. See the "slow playback rate" provisions in the standard talking book specification for an example of such bounded-distortion playback. http://www.w3.org/Search/Mail/Public/search?type-index=w3c-wai-ua&index-type=t&keywords=bingham+slow+multimedia&search=Search </proposal> Al > OR > > (2)a presentation which requires the user to respond interactively at > specific times in the presentation. > > </quote> > > .......I think that the (2) is a definition of "response time dependent > presentation", rather than "time-dependent presentation". The response > time issue is very important, but different. > > Also, I think it would be a good idea to provide language that includes > other sense modalities (tracks). I realize that it is a bit premature > to include "synchronized smell" and "synchronized vibration" tracks, > but, I think we should have language that covers this eventuality. > > > Katie Haritos-Shea > > Internet/Software/Device Accessibility and Standards > Strategist/Developer/Evangelist > > #571-220-7777 > > "The best and most beautiful things in the world > cannot be seen or even touched. > They must be felt with the heart." > - Helen Keller > > > >-- >Charles McCathieNevile http://www.w3.org/People/Charles phone: +61 409 134 136 >W3C Web Accessibility Initiative http://www.w3.org/WAI fax: +33 4 92 38 78 22 >Location: 21 Mitchell street FOOTSCRAY Vic 3011, Australia >(or W3C INRIA, Route des Lucioles, BP 93, 06902 Sophia Antipolis Cedex, France)
Received on Tuesday, 25 June 2002 11:17:27 UTC