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Chapter 29. XML Web Services > An Introduction to WSDL and the Google Search We...

An Introduction to WSDL and the Google Search Web Service

As you can see, building Web services isn't all that complicated. The toughest part about it is generating the proxy class within the command window. This section will introduce you to an even easier way of using and programming against Web service components using WSDL. You've seen how you can create your own Web service and work with the myriad of methods that are limited by your own needs, but how exactly would you use someone else's Web services? The answer lies with WSDL. WSDL is an XML-based language used to describe Web services. WSDL describes the messaging between the Web services, the location of the Web services, and the protocols available to communicate with Web services.

WSDL works with SOAP and UDDI to enable Web services to communicate and coexist with other Web services. WSDL describes the Web service, SOAP provides the transport information, and UDDI provides the location of the Web service. Best of all, because WSDL is XML based, it is completely platform and object model independent.


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