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Re: Roll up in DFXP

From: John Birch <john.birch@screen.subtitling.com>
Date: Fri, 12 Dec 2008 15:49:28 -0000
Message-ID: <4476B296B92A4741A49B0BD01759070099FCAA@sss-uk-ex-02.screen.subtitling.local>
To: <akirkpat@adobe.com>, <public-tt@w3.org>
Counter proposal :-)

Allow markup on a region to define it as a roll-up region (or a crawl). Define semanics that describe how content that is released into these regions should act over time and during conditions of 'region full'.

It's not the content that has a roll character - it's the region...

Agree about empty p elements...

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----- Original Message -----
From: public-tt-request@w3.org <public-tt-request@w3.org>
To: Public TTWG List <public-tt@w3.org>
Sent: Fri Dec 12 15:39:38 2008
Subject: Roll up in DFXP

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 


akirkpat@adobe.com <mailto:akirkpatrick@adobe.com> 


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Received on Friday, 12 December 2008 15:50:17 UTC

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