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application/tve-trigger
To: ietf-types@iana.org
Subject: Registration of MIME media type application/tve-trigger
MIME media type name: application
MIME subtype name: tve-trigger
Required parameters: none
Optional parameters: none
Encoding considerations:
"application/tve-trigger" is the MIME media type associated with
the data sent to a trigger receiver object, in an enhanced TV
application, conforming to the [SMPTE-DDE1] standard. The media
type is used to instantiate a trigger receiver object on a TV
enhancement HTML page. The trigger receiver object is executable
code implemented by a TV receiver.
Sample instantiation:
<OBJECT TYPE="application/tve-trigger" ID="triggerReceiverObj">
</OBJECT>
The OBJECT tag must be void of content. The TYPE and ID
attributes must be set as shown in the example.
The trigger receiver object processes messages, called triggers,
transmitted in a TV signal for the associated TV enhancement.
Triggers are text based, and their syntax follows the basic
format of the [EIA-746A] standard (7-bit ASCII, the high-order
bit of the first byte must be "0").
See [SMPTE-DDE1] for more information on trigger contents and the
trigger receiver object.
Security considerations:
All insertion points for content in the TV network are assumed to
be trusted sources, so no security problems are presumed.
Therefore, the use of scripts in triggers, and ECMA Script in
general is not presumed to be a security problem for malicious
content or viruses any more than the notion of rogue video and
audio being inserted into a broadcaster's emission. As with
video and audio, the broadcaster is responsible for the quality
of the data content of its programming.
Interoperability considerations: none
Published specification:
[SMPTE-DDE1]: "SMPTE XXX, Declarative Data Essence, Content Level
1", produced by the Society of Motion Picture and Television
Engineers (http://www.smpte.org), describes the trigger format,
and the behavior of the trigger receiver object. All SMPTE
standards can be purchased for a nominal fee at
http://www.smpte.org/stds/index.html. Note: SMPTE specification
number will be assigned once registration of this media type is
approved by the IANA.
[EIA-746A]: "Transport Of Internet Uniform Resource Locator (URL)
Information Using TEXT-2 (T-2) Service", produced by Consumer
Electronics Manufacturers Association (CEMA), and can be
purchased from Global Engineering Documents
(http://global.ihs.com/).
Applications which use this media type:
Enhanced television receivers, which conform to [SMPTE-DDE1].
Additional information:
Magic number(s): none
File extension(s): n/a
Macintosh File Type Code(s): n/a
Person & email address to contact for further information:
Linda Bucsay Welsh
Intel Corporation
2111 NE 25th Ave.
Hillsboro, OR 97124-5961
Telephone: 503 264 4987
FAX: 503 264 3375
Internet: linda@intel.com
Intended usage: COMMON
Author/Change controller: SMPTE (http://www.smpte.org)
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