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The increasing number of context aware applications, sensing technologies and positioning algorithms ask for a generic framework that is able to handle the large heterogeneity in contextual information. Thereto, we propose a layered context model that describes the heterogeneity in location information and a reference architecture that contains Distributing Servers and Location Operation Servers. The proposed framework can support location services in a heterogeneous environment. Finally we demonstrate the viability of our framework by implementing parts of our architecture related to a location service. Our service makes use of two different positioning technologies, based on WLAN and Bluetooth infrastructures respectively.

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