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Middleware infrastructures for pervasive computing, in order to be able to support services and users activities, have to deal with both spatially-situated and socially-situated interactions. In this paper, the authors present the solution adopted in the SAPERE middleware that exploits the graph of a social networks, and combines it with relations deriving from spatial proximity, to drive the topology of interactions among users, devices and services. This results in a middleware that facilitates the development and management of services that are adaptive to both spatial and social concerns, and can support effective service discovery and orchestration, and naturally tackles privacy issues.
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