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This may be dif cult given that all large corporations are spread across the globe.
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Guessing the exact name or key of a service without direct communication with the service provider is also made dif cult by the fact that word usage varies depending on location. For example, the word elevator (commonly used in the U.S.) is replaced by the word lift in the U.K. In addition, even within the same locale, different words with the same meaning can be used. For example, the common word get can be replaced with fetch or obtain. Similarly, instead of car, one can also use automobile or vehicle. The inability to guess the name or key, and therefore to discover the service de nition, usually means that the service consumer programmer cannot incorporate the service in his code until the service provider programmer completes his work on the service and informs the programmer on the client side either directly or indirectly as to the speci c name or key chosen for the service in order to register the service. This usually results in the delay of the development of consumer or client applications for a given service. The ability to discover a service de nition without knowing the exact name or key also promotes the portability of client or consumer applications. As an illustration, consider car dealerships of different makes of cars, such as GM, Ford, Toyota, Mazda, and so on. Suppose each of these dealerships develops a service to get the price of its cars. They ll likely use slightly different names, such as getCarPrice, getVehiclePrice, getAutomobilePrice, obtainCarPrice, and so on. Having different names for essentially the same service means that separate consumer applications are needed for each of the brandname dealerships using the present registries. However, if a registry was able to recognize that all these names refer to the same service, it would be able to return the service de nition even though the name in the registry and the client application do not match exactly. Thus, only one consumer application needs to be developed with any one of the obvious names and it will be able to serve all the dealerships.
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Currently, efforts are underway at IBM to solve this problem. A particular solution has been identified, and IBM is waiting for related patents to be issued before incorporating such a solution into its products. Conclusion In this chapter, you learned about the UDDI registry, which is a central place where a consumer of a Web Service can find information about the service and the service provider. This information is needed by
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Fourteen
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the consumer of the service to invoke the service. The UDDI registry is also the place where a service provider can publish information about itself and the services it offers. We started out by discussing the basic data model of a UDDI registry. This basic model consists of five entities: businessEntity, businessService, bindingTemplate, publisherAssertion, and tModel. A businessEntity is used to store information about a service provider such as its name and address. Nontechnical information about a service is stored in the structure businessService. Technical information related to a service and its end point is stored in the entity bindingTemplate. Perhaps the most important entity is the tModel, which serves the dual purpose of providing a technical fingerprint of a service and an abstract namespace. You also learned how to store categorization and identification information in a tModel using categoryBag and identifierBag containers. We also covered how to author or partition a WSDL document related to a service so that it can be easily referenced in a bindingTemplate and a tModel. We also briefly discussed the two APIs offered by the UDDI specification for publishing and for inquiring about an existing service. Finally, we discussed the various commercial products available and some of the future directions for the improvement of these products. With the completion of this chapter, we have reached the end of our discussion of the standards related to Web Services. These standards are XML, SOAP, WSDL, and UDDI. In addition to these standards, we discussed the WS-I Basic Profile, which provides more stringent requirements over and above the other four standards. The purpose of these additional requirements is to ensure the interoperability of Web Services across different platforms. Both application developers and platform vendors must follow the WS-I Basic Profile to guarantee interoperability. In the next chapter, you will learn how to develop Web Services based on the standards that we have discussed in this and the last three chapters. In the next chapter we will describe two different approaches for developing Web Services: a top-down approach and a bottom-up approach. In the top-down approach WSDL is developed first and then the skeleton for the service providers, and the service client is obtained through the use of an automated tool. The developer then completes the skeleton for the service provider according to the design. In the bottomup approach Java Classes or Components are developed first and then a WSDL document is derived from these classes and components.
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