Flows as Compositions of Web Services

The previous sections introduced the basic building blocks of a flow, without focusing too much on the actual realizations of the flow's activities. Although those realizations could be anything from manual realizations by human beings to an assembler program, the goal of WSFL is obviously not so much the composition of flows that coordinate internal implementations, but rather the composition of flows that perform the coordination of Web services, where the Web services implement individual activities.

For that, WSFL first introduces the notion of a service provider as an abstraction for a business partner that offers one or more WSDL services that are used within the flow model. Second, a WSFL activity ...

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