RE: Requirements for external text alternatives for audio/video

The semantics of TTML is specified in terms of XSL:FO, it does not require an XSL:FO implementation.  The majority of the style features in TTML are already found in CSS. The W3C has an implementation of TTML based on conversion into HTML & CSS.

From: public-html-a11y-request@w3.org [mailto:public-html-a11y-request@w3.org] On Behalf Of Eric Carlson
Sent: 25 March 2010 15:46
To: Silvia Pfeiffer
Cc: Geoff Freed; HTML Accessibility Task Force; Matt May
Subject: Re: Requirements for external text alternatives for audio/video


On Mar 24, 2010, at 9:29 PM, Silvia Pfeiffer wrote:


In summary - I would suggest keeping the File Format requirement at
http://www.w3.org/WAI/PF/HTML/wiki/Media_TextAssociations#File_Formats
with supporting both, srt and dfxp (or ttml as Sean clarified).


  What DFXP profile are you suggesting we mandate?

  As Maciej noted [1], even the presentation profile requires XSL-FO. Does anyone actually think it is reasonable to require a UA to implement this substantial spec just to style captions?

eric

[1] - http://lists.w3.org/Archives/Public/public-html-a11y/2010Mar/0103.html