106 Chapter 5 Web Services (Sex offenders web site) Standards The set
106 Chapter 5 Web Services Standards The set of de-facto standards that make up Web Services today can be summarized in a simple equation: Web Services = WSDL + SOAP + UDDI Let s take a quick look at WSDL and SOAP. We won t cover UDDI here because it is not necessarily required: Note that the actual service usage in Figure 5.1 does not depend on the existence of UDDI. The requestor may actually have known the service and its endpoint address without the registry. Also note that the registry is not simply a naming service but supports queries for services that obey a given predicate. At this stage in the life of Web Services, however, it is unclear whether dynamic service lookups in UDDI registry will ever happen on a larger scale than within enterprises. It did not happen with similar concepts that were available earlier, such as CORBA Trading Service. If you have been around in distributed computing for a while some of the technology in the Web Services arena will appear like a d ja vu. Figure 5.1, for example, looks a lot like the RM-ODP trader and later CORBA Trading Service. Many aspects that Web Services address are not new per se but have simply not been solved on a larger scale. WSDL To give you a first impression of a service description in WSDL, here is the definition of the HelloWorld component that we used in Chapter 3:
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