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]. Expiration Date: May 2000 [Page 1]
INTERNET DRAFT December 1999 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 Expiration Date: May 2000 [Page 2]
INTERNET DRAFT December 1999 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 Expiration Date: May 2000 [Page 3]
INTERNET DRAFT December 1999 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]
