The application/smil and application/smil+xml Media Types
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. This memo provides information for the Internet community.