ISSUE-274 (prohibited-semantics): Semantics of "prohibited" features [TTML2] from Timed Text Working Group Issue Tracker on 2013-08-20 (public-tt@w3.org from August 2013)

From: Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Tue, 20 Aug 2013 03:26:56 +0000
To: public-tt@w3.org
Message-Id: <E1VBcau-0000hw-Uu@nelson.w3.org>

ISSUE-274 (prohibited-semantics): Semantics of "prohibited" features [TTML2]

http://www.w3.org/AudioVideo/TT/tracker/issues/274

Raised by: Pierre-Anthony Lemieux
On product: TTML2

(Draft) TTML 2 states that "In addition, a feature or extension may be specified as prohibited, in which case it must not appear in or be used by a Document Instance, and, if it does appear, may result in the Document Instance being rejected or processing otherwise aborted."

A feature such as #overflow states that "A TTML transformation processor supports the #overflow feature if it recognizes and is capable of transforming all defined values of the tts:overflow attribute."

How does one specify that only the default value of tts:overflow shall be used, i.e. that a document instance shall not contain tts:overflow declarations but that the TTML processor shall use the default value of tts:overflow?

Received on Tuesday, 20 August 2013 03:26:57 UTC