Network Working Group P. Hoschka
Request for Comments: 4536 W3C
Category: Informational May 2006
The application/smil and application/smil+xml Media Types
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document specifies the media type for versions 1.0, 2.0, and 2.1
of the Synchronized Multimedia Integration Language (SMIL 1.0, SMIL
2.0, SMIL 2.1). SMIL allows integration of a set of independent
multimedia objects into a synchronized multimedia presentation.
1. Introduction
The World Wide Web Consortium (W3C) has issued specifications that
define versions 1.0 [1], 2.0 [2] and 2.1 [3] of the Synchronized
Multimedia Integration Language (SMIL). This memo provides
information about the application/smil and application/smil+xml media
types.
The definition is based on RFC 3023, which defines the use of the
"application/xml" media type [4]. Before using the
"application/smil" or "application/smil+xml" media type, implementors
must thus be familiar with [4].
2. Synchronized Multimedia Integration Language
SMIL allows integrating a set of independent multimedia objects into
a synchronized multimedia presentation. Using SMIL, an author can
1. describe the temporal behavior of the presentation,
2. describe the layout of the presentation on a screen,
3. associate hyperlinks with media objects, and
4. define conditional content inclusion/exclusion based on
system/network properties.
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RFC 4536 application/smil and application/smil+xml May 2006
3. Registration Information
3.1. Registration of MIME media type application/smil
MIME media type name: application
MIME subtype name: smil
Required parameters: none
Optional parameters:
charset
Same as charset parameter considerations of application/xml in
RFC 3023.
profile
See Section 5 of this document.
Encoding considerations:
Same as encoding considerations of application/xml in RFC 3023
Security considerations: See Section 6, "Security Considerations", of
this document.
Interoperability considerations:
SMIL documents contain links to other media objects. The SMIL
player must be able to decode the media types of these media in
order to display the whole document. To increase
interoperability, SMIL has provisions for including alternate
versions of a media object in a document.
Published specification: See [1], [2], and [3]
Applications which use this media type:
SMIL players and editors
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RFC 4536 application/smil and application/smil+xml May 2006
Additional information:
Semantics of fragment identifiers in URIs: The SMIL media type
allows a fragment identifier to be appended to a URI pointing to a
SMIL resource (e.g., http://www.example.com/test.smil#foo). The
semantics of fragment identifiers for SMIL resources are defined
in the SMIL specification.
Magic number(s):
There is no single initial byte sequence that is always present
for SMIL files. However, Section 4 of this document gives some
guidelines for recognizing SMIL files.
File extension(s): .smil, .smi, .sml
NOTE: On the Windows operating system and the Macintosh platform, the
".smi" extension is used by other formats. To avoid conflicts, it is
thus recommended to use the extension ".smil" for storing SMIL files
on these platforms.
Macintosh File Type Code(s): "TEXT", ".SMI", "SMIL"
Object Identifier(s) or OID(s): none
Person & email address to contact for further information:
The author of this memo.
Intended usage: OBSOLETE
Author/Change controller:
The SMIL specification is a work product of the World Wide Web
Consortium's SYMM Working Group.
The W3C has change control over the specification.
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RFC 4536 application/smil and application/smil+xml May 2006
3.2. Registration of MIME media type application/smil+xml
MIME media type name: application
MIME subtype name: smil+xml
Required parameters: See registration of application/smil.
Optional parameters: See registration of application/smil.
Encoding considerations: See registration of application/smil.
Security considerations: See Section 6, "Security Considerations", of
this document
Interoperability considerations: See registration of
application/smil.
Published specification: See registration of application/smil.
Applications which use this media type: See registration of
application/smil.
Additional information: See registration of application/smil.
Magic number(s): See registration of application/smil.
File extension(s): See registration of application/smil.
Macintosh File Type Code(s): See registration of application/smil.
Object Identifier(s) or OID(s): See registration of application/smil.
Person & email address to contact for further information: See
registration of application/smil.
Intended usage: COMMON
Author/Change controller: See registration of application/smil.
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RFC 4536 application/smil and application/smil+xml May 2006
4. Recognizing SMIL Files
All SMIL files will have the string "
RFC, FYI, BCP