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Roll up in DFXP

From: Andrew Kirkpatrick <akirkpat@adobe.com>
Date: Fri, 12 Dec 2008 07:39:38 -0800
To: Public TTWG List <public-tt@w3.org>
Message-ID: <5076E68FCD2E91428C2479984A81E1147B17D17542@NAMBX01.corp.adobe.com>
>From an interested party.

Rollup Captions
To properly represent 608/708 closed captions, it is important that DFXP TimedText provide some basic support for roll-up style captions. [company] has yet to formalize plans in this area, but is proposing the following basic structure:

    *   Allow for a <body>, <div>, or individual <p> element to be tagged as rollup, with an attribute indicating the number of lines of rollup text (typically 2 or 3 lines).
    *   Leverage the proposed upperThird/middleThird/lowerThird region tag to allow for the rollup caption area to be positioned appropriately on the screen. Software that converts 608/708 captions to TimedText can inspect the line positioning and infer the appropriate screen region.
    *   Interpret empty <p> tags as a command to clear the roll-up display. Software that converts 608/708 captions to TimedText would generate an empty <p> tag whenver encountering {EDM} erase commands.


Andrew Kirkpatrick

Senior Product Manager, Accessibility

Adobe Systems

Received on Friday, 12 December 2008 15:41:02 UTC

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