Abstract
Web Services are useful only if clients can find out what services are available in the first place, where to locate them, and how exactly those services can be called. A number of ongoing initiatives driven by major vendors in the Web Service area address application development and business needs. Two of the more important ones—both supported by the Microsoft .NET Framework and fully integrated in Visual Studio.NET—are (1.) the Web Service Description Language (WSDL), which is an XML format to describe how a particular Web Service can be called, what arguments it takes, and (2.) the Universal Description, Discovery, and Integration (UDDI), a directory that publishes business entities and the Web Services they offer, and where one can find those services. UDDI is implemented as a Web Service itself. Additionally, there's DISCO, an XML-based mechanism developed by Microsoft to dynamically discover Web Services running on a particular machine.
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