Virtual Organizations have been recently employed as an abstraction for modelling dynamical and complex systems. The Norm concept has arisen inside the Multi-Agent Theory for avoiding conflicts and ensuring coordination and cooperation in open environments. In this work, a desing of norms that govern Virtual Organizations is proposed, which is based on a service-oriented approach. Therefore, we define a formal normative language for mainly controlling service registering and usage. Thus, a better integration of both Web Services and MAS Technology is achieved.
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