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Software infrastructures for networked enterprises may need data coming from low-level pervasive devices, such as Wireless Sensor Networks (WSNs). However, the complex management of such tiny physical devices is not acceptable for high-level enterprise applications. Hence the need for a middleware layer that hides complexity and supports the management of heterogeneous real-time data coming from the environment. In our opinion, the Service Oriented Architecture (SOA) design paradigm is the most suitable for allowing a seamless and effective integration of pervasive technologies into enterprise information systems. In this paper we present a service-oriented, flexible and adaptable middleware that allows applications to configure WSN functionalities and exploit them in the form of Web Services.