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

On Mon, Aug 19, 2013 at 9:26 PM, Timed Text Working Group Issue Tracker <
sysbot+tracker@w3.org> wrote:

> 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?
>

I'll remove the "or be used by", which should fix your concern. When I
wrote it, I was not including the processor use of a default non-specified
value in "use".