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Wireless Sensor Networks (WSNs) are deployed for a wide range of applications to sense closely and collectively the environment in which they are placed. To provide services related to sensed data from a WSN to a user through Internet as per requirements has a great technological and commercial potential. For this it is necessary that a suitable WSN is quickly discovered automatically for the user. Use of technology meant for Semantic Web enables the discovery of the desired WSN which can meet the remote users' requirements. The emerging concept of the use of WSN as Service Provider for sensing services has been explored here. The service features have to be integrated with the WSN as well as the interface connecting the WSN and the Internet. In this paper we have defined modules to extend sensor node to support sensing services. The main processes related to service discovery, delivery and new service registration have been elaborated. Related considerations and requirements have been discussed.