Web Services Orchestrations Evolution: A Merge Process for Behavioral Evolution

Services Oriented Architectures preach loosely-coupled services and high–level composition mechanisms, using for example Web Services to define services and Orchestrations to compose them. But orchestration evolutions imply modification at source code level. This article shows how the orchestration paradigm itself can be used to support evolution of Web Services Orchestrations through a behavioral merge process. Using the same model to express orchestrations and evolutions, we expose formally and illustrate in this contribution a merging process helping Wsoa administrators to deal with behavioral evolutions.