http://www.rfc-editor.org/rfc/rfc4589.txt
RFC 4589: Location Types Registry, H. Schulzrinne, H. Tschofenig2006-07-01T23:00:00-00:00This document creates a registry for describing the types of places a human or end system might be found. The registry is then referenced by other protocols that need a common set of location terms as protocol constants. Examples of location terms defined in this document include aircraft, office, and train station. [STANDARDS-TRACK]