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SOAP, WSDL, and UDDI. Figure 14-9 illustrates working of a simple

Web service.

We discussed XML earlier, which is designed especially for web

documents. The Simple Object Access Protocol (SOAP) is a message-

passing protocol that defines how to send tagged or marked-up data from

one software application to another across a network. Web Services

Description Language (WDSL) is a XML-formatted language. Universal

Description, Discovery and Integration (UDDI) is a Web-based

distributed directory that can be used by businesses to list and discover

each other on the Internet. It is similar to a traditional phone book's yellow

and white pages. Web services allow programs written in different

languages on different platforms to communicate with each other and

accomplish various tasks, e.g. transaction processing. In a web service, all

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