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Registration of media type application/ttaf+xml

From: Philippe Le Hegaret <plh@w3.org>
Date: Wed, 30 Sep 2009 15:46:15 -0400
To: ietf-types@iana.org
Cc: Glenn Adams <glenn@xfsi.com>, public-tt@w3.org
Message-Id: <1254339975.7508.7.camel@chacal>
The following media type registration will be submitted to
the IESG for review, approval, and registration with IANA (as per [1]).

At this point, we would appreciate comments on this registration
information.  If you see any problems, please let us know.



[1] http://www.w3.org/2002/06/registering-mediatype


This appendix registers a new MIME media type, "application/ttaf+xml"
in conformance with [1144]BCP 13 and [1145]W3CRegMedia. The information
in this appendix is being submitted to the Internet Engineering
Steering Group (IESG) for review, approval, and registration with the
Internet Assigned Numbers Authority (IANA).

    [1144] http://www.ietf.org/rfc/rfc4288.txt
    [1145] http://www.w3.org/2002/06/registering-mediatype.html

   MIME media type name:

   MIME subtype name:

   Required parameters:

   Optional parameters:
          The encoding of a TT AF document must be determined by the
          XML encoding declaration. This has identical semantics to the
          application/xml media type in the case where the charset
          parameter is omitted, as specified in [1146][XML Media],
          Sections 8.9, 8.10 and 8.11.

          The document profile of a TT AF document 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 [1147]6.2.8
          ttp:profile of the published specification.

   Encoding considerations:
          Same for application/xml. See [1148][XML Media], Section 3.2.

   Restrictions on usage:

   Security considerations:
          As with other XML types and as noted in [1149][XML Media]
          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

          In addition, because of the extensibility features for TT AF
          and of XML in general, it is possible that
          "application/ttaf+xml" may describe content that has security
          implications beyond those described here. However, if the
          processor follows only the normative semantics of the
          published specification, this content will be outside TT AF
          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.

   Interoperability considerations:
          The published specification describes processing semantics
          that dictate behavior that must be followed when dealing
          with, among other things, unrecognized elements and
          attributes, both in TT AF namespaces and in other namespaces.

          Because TT AF is extensible, conformant
          "application/ttaf+xml" processors must expect that content
          received is well-formed XML, but it cannot be guaranteed that
          the content is valid to a particular DTD or Schema or that
          the processor will recognize all of the elements and
          attributes in the document.

   Published specification:
          This media type registration is extracted from Appendix
          [1150]D Media Type Registration of the [1151]Timed Text (TT)
          Authoring Format 1.0 - Distribution Format Exchange Profile
          (DFXP) specification.

    [1151] http://www.w3.org/TR/ttaf1-dfxp/

   Additional information:

   Person & email address to contact for further information:
          Glenn Adams (public-tt@w3.org)

   Intended usage:

   Author/Change controller:
          The published specification is a work product of the World
          Wide Web Consortium's Timed Text (TT) Working Group. The W3C
          has change control over this specification.

Received on Wednesday, 30 September 2009 19:46:20 UTC

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