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. Hoschka Informational [Page 1] 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 Hoschka Informational [Page 2] 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. Hoschka Informational [Page 3] 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. Hoschka Informational [Page 4] RFC 4536 application/smil and application/smil+xml May 2006 4. Recognizing SMIL Files All SMIL files will have the string "