http://www.rfc-editor.org/rfc/rfc5870.txt
RFC 5870: A Uniform Resource Identifier for Geographic Locations ('geo' URI), A. Mayrhofer, C. Spanring2010-06-01T23:00:00-00:00This document specifies a Uniform Resource Identifier (URI) for geographic locations using the 'geo\' scheme name. A 'geo' URI identifies a physical location in a two- or three-dimensional coordinate reference system in a compact, simple, human-readable, and protocol-independent way. The default coordinate reference system used is the World Geodetic System 1984 (WGS-84). [STANDARDS-TRACK]