http://www.rfc-editor.org/rfc/rfc4395.txt
RFC 4395: Guidelines and Registration Procedures for New URI Schemes, T. Hansen, T. Hardie, L. Masinter2006-02-01T23:00:00-00:00This document provides guidelines and recommendations for the definition of Uniform Resource Identifier (URI) schemes. It also updates the process and IANA registry for URI schemes. It obsoletes both RFC 2717 and RFC 2718. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.