http://www.rfc-editor.org/rfc/rfc4288.txt
RFC 4288: Media Type Specifications and Registration Procedures, N. Freed, J. Klensin2005-12-01T23:00:00-00:00This document defines procedures for the specification and registration of media types for use in MIME and other Internet protocols. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.