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Web Services: Programs
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XML is used to encode all communications to a Web service. For example, a client invokes a Web service by sending an XML message, then waits for a corresponding XML response. Because all communication is in XML, Web services are not tied to any one operating system or programming language--Java can talk with Perl; Windows applications can talk with Unix applications.
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Web services can be combined in such as way that messages are passed around in a very random fashion. However, a particular design techniqe is for a master process to delegate to other services in a recusive tree-like manner, as has been de rigueur in programming languages since Pascal. For example, if the consumer asks the travel agent and the the travel agent books a hotel, the hotel will reply to the travel agent, not to the consumer. This makes everything orderly.
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The SOAP messaging format used for your Web service doesn't necessarily determine the programming model you use. Learn more about SOAP messaging formats and decoupling the message format from the programming model.
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