A service choreography is a model of interactions in which a set of services engage to achieve a goal, seen from the perspective of an ideal observer that records all messages exchanged between these services. Choreographies have been put forward as a starting point for building service-oriented systems since they provide a global picture of the system's behavior. In previous work we presented a language for service choreography modeling targeting the early phases of the development lifecycle. This paper provides an execution semantics for this language in terms of a mapping to π-calculus. This formal semantics provides a basis for analyzing choreographies. The paper reports on experiences using the semantics to detect unreachable interactions.
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