- From: Philipp Hoschka <ph@w3.org>
- Date: Sat, 11 Dec 1999 12:52:06 +0100
- To: www-smil@w3.org
Looks like my mailer garbled the previous message. Here is another
try; hopefully more readable. If not, below is a URI where you
can find it as well.
http://www.ietf.org/internet-drafts/draft-hoschka-smil-media-type-03.txt
------
Network Working Group P. Hoschka
INTERNET DRAFT W3C
draft-hoschka-smil-media-type-03.txt December 1999
The application/smil Media Type
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet- Drafts as reference
material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
Abstract
This document specifies the Media Type of the Synchronized Multimedia
Integration Language (SMIL 1.0, pronounced "smile"). SMIL allows
integrating a set of independent multimedia objects into a
synchronized multimedia presentation.
1. Introduction
The World Wide Web Consortium has issued a Recommendation [1], which
defines version 1 of the Synchronized Multimedia Integration
Language. This memo provides information about the application/smil
Media Type.
The definition is based on the definition of the "application/xml"
media type [3]. The "application/smil" media type cannot be
implemented without reading and understanding the document describing
the "application/xml" media type [3].
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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
SMIL is defined using XML [2], and the definition of the SMIL media
type is based on the defintion of XML media types [3].
3. Registration Information
To: ietf-types@iana.org
Subject: Registration of MIME media type application/smil
MIME media type name: application
MIME subtype name: smil
Required parameters: none
Optional parameters: charset
All of the considerations for "application/xml" media type [3] also
apply to the SMIL media type.
Encoding considerations:
All of the considerations for "application/xml" media type [3] also
apply to the SMIL media type.
Security considerations:
SMIL documents contain a construct that allows "infinite loops".
This is indispensible for a multimedia format. However, SMIL clients
should foresee provisions such as a "stop" button that lets users
interrupt such an "infinite loop".
As with HTML, SMIL documents contain links to other media
(images,sounds, videos, text, ...) and those links are typically
followed automatically by software, resulting in the transfer of
files without the explicit request of the user for each one. The
security considerations of each linked file are those of the
individual registered types.
In addition, SMIL has some of the same security considerations as
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specified in [3], with the following exceptions: the section on XML
entities does not apply, since SMIL 1.0 disallows entities.
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]
Applications which use this media type:
SMIL players
Additional information:
Semantics of fragment identifiers in URIs: The SMIL media type allows to
append a fragment identifier to a URI pointing to a SMIL resource (e.g.
http://www.example.com/test.smil#foo). The semantics of fragment
identifers for SMIL resources are defined in [1].
Magic number(s): none
All of the considerations for "application/xml" media type [3] also
apply to the SMIL media type.
File extension(s): .smil, .smi, .sml
NOTE: On the Windows operating system, the ".smi" extension is
used by another format. To avoid conflicts, it is thus
strongly recommended not to use the extension ".smi" for storing
SMIL files on systems running the Windows operating system.
Macintosh File Type Code(s): "TEXT"
Object Identifier(s) or OID(s): none
Person & email address to contact for further information:
The author of this memo.
Intended usage: COMMON
Author/Change controller:
The SMIL specification is a work product of the World Wide Web
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Consortium's SYMM Working Group, and was edited by:
Philipp Hoschka (ph@w3.org)
The W3C has change control over the SMIL specification.
5. References
[1] "Synchronized Multimedia Integration Language (SMIL) 1.0
Specification", W3C Recommendation REC-smil-19980615,
http://www.w3.org/TR/1998/REC-smil/, July 1998.
[2] "Extensible Markup Language (XML) 1.0", W3C Recommendation
REC-xml-19980210, http://www.w3.org/TR/REC-xml/,
February 1998.
[3] E. J. Whitehead Jr., M. Murata. "XML Media Types", RFC 2376,
UC Irvine, Fuji Xerox Info. Systems, July 1998.
6. Author's Address
Philipp Hoschka
W3C/INRIA
2004, route des Lucioles - B.P. 93
06902 Sophia Antipolis Cedex
FRANCE
Phone: +33 (0)492387984
Fax:+33 (0)493657765
EMail: ph@w3.org
Expiration Date: May 2000 [Page 4]
Received on Saturday, 11 December 1999 06:52:11 UTC