The technique of adapting the web service allows the user to establish reusable, interoperable, flexible and context-aware applications. In fact, the pervasive system specification is provided by the context-aware applications since it is dynamically adapted. Furthermore, we seek to offer a dynamic description of the web services. This objective, however, can be achieved by adding contextual information structures to the web service description. In the literature, more research works strive to

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... ombine the contextual description with the web service description using the OWL-S structure.In fact, the main objective of this paper is to propose structures with two levels for the contextual description of the pervasive system. This description is based on the generic model for the pervasive system design. We, also, suggest integrating such a description into the OWL-S structure.