Human interaction occurs always in a specific context and in a particular environment, and a common knowledge base about them is essential for understanding each other. By immersing computational system into physical world, pervasive computing bring us from traditional desktop computing interaction, to a new paradigm of interaction closer to Humans one’s in term of context and environment dependency, and knowledge sharing. To tackle this problem, we present in this paper, XCM, a generic coordination model for Pervasive Computing. XCM is organized around a ract concepts (entity, environment, social law and port), and is expressed as an ontology by using semantic web languages. While the concepts of XCM deal with environmental representation and context-dependency, the use of the semantic web language OWL allows us to achieve knowledge sharing and context reasoning within Pervasive Computing coordination. Keywords : Pervasive Computing, Ontology, Semantic Web, Coordination Model, cont...