Chapter 5. Using BPEL to Build Composite Services and Business Processes
In the previous two chapters, we saw how we can service-enable functionality embedded within existing systems. The next challenge is how to assemble these services to build "composite" applications or business processes. This is the role of the Web Service Business Process Execution Language (WS BPEL) or Business Process Execution Language (BPEL), as it's commonly referred to.
BPEL is a rich XML-based language for describing the assembly of a set of existing web services into either a composite service or a business process. Once deployed, a BPEL process itself is actually invoked as a web service.
Thus, anything that can call a web service, can also call a BPEL process, including ...
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