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This paper presents a middleware for Wireless Sensor Networks that uses a set of technical statements, such as patterns and styles, in order to achieve flexibility, autonomy and adaptation. The middleware exposes the functionality of the network as Semantic Web Services, so that applications can access its functionality through Web Services. The Service-oriented architecture is used as a means of interaction between the network and the external elements. Inside the network, standards connectors, such as Dispatcher and Interceptors, are used. This paper also presents a scenario in which two services are exposed as semantic Web services and designed to run in a constrained environment and they are exchanged in accordance with the capabilities of the network.