A Theory of Adaptable Contract-based Service Composition.

Service Oriented Architectures draw heavily on techniques for reusing and assembling off-the-shelf software components. While powerful, this programming practice is not without a cost: the software architect must ensure that the offthe- shelf components interact safely and in ways that conform with the specification. We develop a new theory for adaptable service composition. The theory provides an effective framework for analyzing the conformance of contract-based service compositions, and for enforcing their compliance, in a uniform, formally elegant setting