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[Fwd: [IANA #711352] Request for MIME media type Application/Standards Tree - ttml+xml]

From: Philippe Le Hegaret <plh@w3.org>
Date: Fri, 03 Jan 2014 10:14:55 -0500
Message-ID: <1388762095.23746.2.camel@chacal>
To: public-tt <public-tt@w3.org>
Are we interested in the proposed rewording from the IESG?

-------- Forwarded Message --------
>
> The text is technically correct, but worded in a way that doesn't really
> make sense in the context of a registration. How about:
> 
>   Encoding considerations: binary
> 
>   Encoding considerations for this type are the same as for application/xml, except constrained to either UTF-8 or UTF-16. See [XML Media Types] (http://www.rfc-editor.org/rfc/rfc3023.txt), Section 3.2 or its successor(s) if appropriate for additional guidance.
> 
> > thanks,
> > Amanda
> 
> > ===
> 
> > Name : Philippe Le Hegaret
> 
> > Email : plh@w3.org
> 
> > MIME media type name : Application
> 
> > MIME subtype name : Standards Tree -ttml+xml
> 
> > Required parameters : none
> 
> > Optional parameters :
> > charset
> > If specified, the charset parameter must match the XML encoding declaration. See Encoding Considerations below. It is thus constrained to either UTF-8 or UTF-16. When charset is not specified, the default value is the actual encoding.
> 
> > profile
> > The document profile of a TTMLDocument Instance may be specified using an optional profile parameter, which, if specified, the value of which must adhere to the syntax and semantics of ttp:profile parameter defined by Section 6.2.8 ttp:profile [1] of the published specification.
> > http://www.w3.org/TR/ttaf1-dfxp/#parameter-attribute-profile
> 
> 
> 
> > Security considerations :
> > As with other XML types and as noted in [XML Media Types] (http://www.rfc-editor.org/rfc/rfc3023.txt), Section 10, repeated expansion of maliciously constructed XML entities can be used to consume large amounts of memory, which may cause XML processors in constrained environments to fail.
> 
> > In addition, because of the extensibility features for TTML and of XML in general, it is possible that "application/ttml+xml" may describe content that has security implications beyond those described here. However, TTML does not provide for any sort of active or executable content, and if the processor follows only the normative semantics of the published specification, this content will be outside TTML namespaces and may be ignored. Only in the case where the processor recognizes and processes the additional content, or where further processing of that content is dispatched to other processors, would security issues potentially arise. And in that case, they would fall outside the domain of this registration document.
> 
> > Although not prohibited, there are no expectations that XML signatures or encryption would normally be employed.
> 
> 
> > Interoperability considerations :
> 
> 
> > Published specification :
> > This media type registration is extracted from Appendix C Media Type Registration of the Timed Text Markup Language (TTML) 1.0 specification:
> > http://www.w3.org/TR/ttaf1-dfxp/
> > Timed Text Markup Language (TTML) 1.0.
> 
> 
> > Applications which use this media :
> > TTML is used in the television industry for the purpose of authoring, transcoding and exchanging timed text information and for delivering captions, subtitles, and other metadata for television material repurposed for the Web or, more generally, the Internet.
> 
> > There is partial and full support of TTML in components used by several Web browsers plugins, and in a number of caption authoring tools.
> 
> 
> > Additional information :
> 
> > 1. Magic number(s) : none
> > 2. File extension(s) : .ttml
> > 3. Macintosh file type code : "TTML"
> > 4. Object Identifiers: none
> 
> > Encoding Considerations:
> > Same for application/xml, except constrained to either UTF-8 or UTF-16. See [XML Media Types] (http://www.rfc-editor.org/rfc/rfc3023.txt), Section 3.2.
> 
> > Fragment identifiers:
> 
> > For documents labeled as application/ttml+xml, the fragment identifier notation is intended to be used with xml:id attributes, as described in section 7.2.1 of the Timed Text Markup Language 1 (TTML1) specification [1].
> 
> > [1] http://www.w3.org/TR/ttaf1-dfxp/
> 
> 
> > Person to contact for further information :
> 
> > 1. Name : Timed Text Working Group
> > 2. Email : public-tt@w3.org
> 
> > Intended usage : Common
> 
> 
> > Author/Change controller : The published specification is a work product of the World Wide Web Consortium's Timed Text (TT) Working Group.
> 
> 
> 
Received on Friday, 3 January 2014 15:15:02 UTC

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