Throughout the book, the diamond-on-a-stick convention is used to represent a Web services interface in VS .NET

Drawer QR Code 2d barcode in VS .NET Throughout the book, the diamond-on-a-stick convention is used to represent a Web services interface
Throughout the book, the diamond-on-a-stick convention is used to represent a Web services interface
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Figure 1-2 Applications can use Web services to book a restaurant table and make hotel and flight reservations
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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Web services are also very useful for discovering and interacting with Internet sites that provide online order entry systems, such as the one for the Skateboots Company's trendy skateboots a boot with a retractable ice skate built in like the ones that Batman and Robin used in the movie Batman and Robin Sporting goods retailers interested in stocking the boots, this year's hot new item, can use Web services to place advance bulk orders in batch, to check the status of an order, or to place in-season restocking orders and be immediately notified of back orders, if the manufacturer is out of stock Web services building blocks provide standard components of the application for the Skateboots Company, which isn't large enough to host its own entire application infrastructure Web services hosting companies provide security services to ensure that Skateboots accepts orders only from approved retailers and to provide credit validation services for approving bulk advance orders Still other companies help Skateboots by providing electronic funds collection and accounting services Web services discover and interact with one another
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The entire Skateboots order entry system is exposed to the Internet as a Web service, but behind the top-level Web service are a number of other Web services working together to provide the necessary functionality Figure 1-3 illustrates how Web services can change the way business applications are built and used The retailer interested in stocking skateboots inputs a request to its local inventory management service, which is exposed to the shop computers as a Web service The local inventory service then contacts the manufacturer's Web service over the Internet and sends the order for the correct number of skateboots, based on available shelf space and the most popular sizes Figure 1-3 The Skateboots order entry service comprises several other Web services
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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The Skateboots Company's order entry system comprises multiple Web services, including a custom-built part that deals with the unique aspects of its product and several commodity parts that take care of standard functions, such as authenticating the user, credit authorization, and accounting and billing, all hosted by other companies that specialize in providing such services over the Internet Creating business applications using Web services entails putting into proper relationship a number of other Web services, which can be implemented by using any combination of programming language, operating system, or packaged software, inside or outside the firewall (This is also the way in which Web services solve the difficult EAI problem) In establishing the proper relationship, or flow, of related Web services, it also automates the corresponding business processes and procedures Through the widespread adoption of Web services, the Internet is becoming more efficient, especially for business interactions In the n generation of the Web, Web services building ext blocks will enable automatic Internet interactions, combining direct access to software applications and business documents, bypassing familiar text-based Web pages to access softwarebased data directly Furthermore, fundamental Web services building blocks are very likely to be hosted and published by a variety of companies focusing on a specific functional component, such as authentication, transactional coordination, or accounting and billing This change to direct application-to-application interaction over the Web lies at the heart of Web services, what they mean, and how they work Web services create greater commercial efficiencies
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Toward a Common Understanding
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Web services technology exists at a sufficiently high level of abstraction to support multiple simultaneous definitions, which are sometimes contradictory At the simplest level, Web services can be thought of as Internet-oriented, text-based integration adapters Any data can be mapped into and out of ASCII text, and this type of mapping has long been the lowest common denominator for graphical display systems and database management systems If all else fails, the saying goes, map the data to text Text-based systems also are behind the success of the World Wide Web, on which the additional abstraction of Web services is based Any computer or operating system is capable of supporting HTML and Web servers, and browsers, and when they download files, they don't care or even know what type of back-end systems they're interacting with The same is true for Web services, which often leads to a lot of confusion when developers of traditional, or established, computing environments try to understand Web services technology in reference to a single type of distributed software system, such as CORBA, J2EE, or NET Because Web services are much more abstract more like adapters than they are like interfaces it will be some time before the industry settles on truly common definitions and conventions for them
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