International audienceRequirements of open systems involve constraints on clients behavior as well as system functionalities. Clients are supposed to follow policy rules derived from such constraints. Otherwise, the system as a whole might fall into undesired situations. This paper proposes a framework for system description in which client behavior and policy rules are explicitly separated. The description is encoded in Maude so that advanced analysis techniques such as LTL model-checking are applied to reason about the system properties

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