Web service orchestration driven by formal specification

Abstr act. When set of basic web service is built, the next step is to create more complex one. A programmatic approach uses declarative language such as BPEL. This kind of representation is verbose and needs assistance for the creation of business process. We defined a generative strategy leading by formal specification. Because, web service composition languages use standard operators like sequence, choice and parallel; process algebras are right candidate for their design. We use higher order pi calculus for specification of orchestration and consider it as a basis for generating BPEL skeleton. After enrichment of BPEL definition, we interpret it by mobile agents. They play role of a conductor which evaluates a part or a whole BPEL definition. This mobile engine reduces message traffic by replacing message transfer into local message operating. We use mobile agent as distributed conductor of business processes.