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We present a novel software architecture for contextaware applications based on a distributed, non-monolithic, simple and extensible relational model for representing context; a service-oriented architecture for computing these relations in a decoupled, flexible fashion; and with data driven, event based communication providing the kind of fine grained dynamic service composition required in mobile and volatile environments. A prototype implementation is running a Bluetooth-sensor-based active map of users at our home university.doi:10.1109/percomw.2011.5766932 dblp:conf/percom/DeboisGZ11 fatcat:ts2irqnqi5hcni7izlklkqe56y