Context awareness of such applications is the subject of a recent field of studies in a information systems. Web services are a solution for the integration of distributed information systems, autonomous, heterogeneous and auto adaptable to the context. This is what we call self-adaptability to context. In this paper, we are interested in defining a context meta-model to provide the different needs of a self-adaptability of SOA to context and showing the feasibility of this approach in an e-healthcare case study.