W3C home > Mailing lists > Public > public-tt@w3.org > June 2012

Re: more profile confusion ( ISSUE-170)

From: Andreas Tai <tai@irt.de>
Date: Mon, 11 Jun 2012 17:27:50 +0200
Message-ID: <4FD60E76.6020108@irt.de>
To: Glenn Adams <glenn@skynav.com>
CC: Michael A Dolan <mdolan@newtbt.com>, public-tt@w3.org
 From my reading the profile mechanism is a TTML feature itself and can 
be optional. So if the context make the profile mechanism optional it is 
not needed for a TTML processor to implement it. Am I correct?

Furthermore it maybe a possibility for TTML 1.1 to reflect on the 
profile mechanism with respect to it´s implementation by TTML 

Best regards,


Am 06.06.2012 18:28, schrieb Glenn Adams:
> ok, that's a reasonable clarification; i agree that "if the document 
> interchange context does not specify a profile" is not sufficiently 
> precise
> On Wed, Jun 6, 2012 at 10:07 AM, Michael A Dolan <mdolan@newtbt.com 
> <mailto:mdolan@newtbt.com>> wrote:
>     I agree with the spirit of what you say.  But as drafted, the
>     Recommendation is using a defined term, “profile”, so I disagree
>     that it does not, as drafted, require a profile document.  That’s
>     the issue.  Even if you read it differently, the point is that
>     others read it the same as I do, and therefore it needs
>     clarification.  I proposed “conforming subset or something more
>     generic”.  How about “…and if the document interchange context
>     does not specify a profile document, or other equivalent set of
>     feature designators,…”
>     Whatever wording works for you is fine with me.
>     Regards,
>                     Mike
>     *From:*Glenn Adams [mailto:glenn@skynav.com
>     <mailto:glenn@skynav.com>]
>     *Sent:* Wednesday, June 06, 2012 8:49 AM
>     *To:* Michael A Dolan
>     *Cc:* public-tt@w3.org <mailto:public-tt@w3.org>
>     *Subject:* Re: more profile confusion
>     On Wed, Jun 6, 2012 at 8:51 AM, Michael A Dolan <mdolan@newtbt.com
>     <mailto:mdolan@newtbt.com>> wrote:
>     Another troubling profile sentence in 5.2 was called to my attention:
>     If neither|ttp:profile|
>     <http://www.w3.org/TR/ttaf1-dfxp/#parameter-attribute-profile>attribute
>     nor|ttp:profile|
>     <http://www.w3.org/TR/ttaf1-dfxp/#parameter-vocabulary-profile>element
>     is present in a TTML document instance, and if the document
>     interchange context does not specify a profile, then the DFXP
>     Transformation profile applies.
>     A “document interchange context” might well fully define a
>     conforming subset definition, but it may or may not formally
>     define a “profile” as defined in the recommendation.
>     An instance document would more likely declare its conformance by
>     some other means, such as reference to a schema, or using
>     xml-model, or simply by its context (e.g. a branded MP4 file).
>     When we get to overhauling the profile language, we should fix the
>     above, minimally replacing “profile” with “conforming subset” or
>     something more generic that does not imply a TTML Profile
>     definition is required.
>     Actually, I think I do not agree with this. The point of the above
>     cited language is to ensure that the applicable profile is well
>     defined, since it is necessary to know the applicable profile in
>     order to perform processing in a compliant manner.
>     As reference to a profile defined/specified by a document
>     interchange context is intended to serve as a out-of-band protocol
>     to allow determination of which profile applies. It does not mean
>     that a ttp profile document must be available for either author or
>     client, it means that the information that would be included in
>     such a document is known is some manner, whether or not it is
>     defined in a profile file.
>     Finally, the phrase "conforming subset" has no formal meaning/use
>     in TTML at present other than indirectly through the use of
>     profile definitions.

Andreas Tai
Production Systems Television IRT - Institut fuer Rundfunktechnik GmbH
R&D Institute of ARD, ZDF, DRadio, ORF and SRG/SSR
Floriansmuehlstrasse 60, D-80939 Munich, Germany

Phone: +49 89 32399-389 | Fax: +49 89 32399-200
http: www.irt.de | Email: tai@irt.de

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Received on Monday, 11 June 2012 15:29:35 UTC

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