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Chapter 31. Consuming and Providing XML ... > Gaining a Web Services Vocabulary

Gaining a Web Services Vocabulary

Web services exchange messages between a consumer (client or sender) and provider (server or receiver). The provider and consumer are called endpoints. The consumer initiates the exchange with an XML request document; the provider ordinarily returns an XML response document that contains the requested information. If the request message is malformed or the provider can’t supply the requested information, a fault occurs.

Like other Web-related technologies, Web services are, by definition, loosely coupled. Loosely coupled means that Web services don’t rely on a permanent connection between the consumer and provider. Providers listen for incoming SOAP request messages and respond in ad hoc fashion. Windows XP/2000+ use Internet Information Server (IIS) 5.0+ and an Internet Services Application Programming Interface (ISAPI) filter to listen for incoming request messages and route the messages to the appropriate service. Thus, you can set up your own public or private services that run on Windows XP or 2000 Professional, as well as Windows 2000+ server.


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