Web services can also be used to implement an architecture according to service-oriented architecture (SOA) concepts, where the basic unit of communication is a message, rather than an operation. This is often referred to as "message-oriented" services.
SOA Web services are supported by most major software vendors and industry analysts. Unlike RPC Web services, loose coupling is more likely, because the focus is on the "contract" that WSDL provides, rather than the underlying implementation details.
Middleware analysts use enterprise service buses (ESBs) that combine message-oriented processing and Web services to create an event-driven SOA. One example of an open-source ESB are WSO2 ESB,Mule and Open ESB.
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