http://www.rfc-editor.org/rfc/rfc4688.txt
RFC 4688: A Uniform Resource Name (URN) Namespace for Aerospace and Defence Industries Association of Europe (ASD) Specification 1000D, S. Rushing2006-10-01T23:00:00-00:00This document describes a Uniform Resource Name (URN) namespace for naming persistent resources defined by Aerospace and Defence Industries Association of Europe (ASD) Specification 1000D. This memo provides information for the Internet community.