Microsoft has proposed an identity metasystem to standardize identity services and the principles behind them. A location metasystem can support interoperation between location services, protect users’ privacy and handle issues of granularity. The simple OAuth protocol may be a good model for working towards a location metasystem. Categories and Subject Descriptors H.3.5 [Information Storage and Retrieval]: Online Information Services – Web-based services. General Terms Security, Human Factors, Standardization, Theory. Keywords Location, metasystem, identity, privacy, granularity.