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  • WS-BPEL is an orchestration executable language for specifying interactions with Web Service
    • Defines an interoperable integration model for Web Service-based processes.
    • Describes high-level state transition interactions of a process.
  • The language supports following basic facilities:
    • Message exchanges,
    • Property-based message correlation mechanism,
    • XML and WSDL typed variables,
    • Structured programming-language concepts such as if-then-else, while, sequence, and flow,
    • Scoping system to allow encapsulation of logic with local-variables, fault-, compensation- and event- handlers,
    • Serialized scopes to control concurrent access to variables,
    • Language plug-in model which allows expression writing in the language such as XPath

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