Developing SOAP-based web services
As stated, web services are based on the exchange of messages using nonproprietary protocol messages. The messages themselves are not sufficient to define the web service platform. We actually need a list of standard components, including the following:
A language used to define the interfaces provided by a web service in a manner that is not dependent on the platform on which it is running or the programming language used to implement it
A common standard format to exchange messages between web service providers and web service consumers
A registry within which service definitions can be placed
The Web Service Description Language, also known as WSDL, (http://www.w3.org/TR/wsdl) is the de facto standard to provide a description of a web service contract exposed to clients. In particular, a WSDL document describes a web service in terms of the operations that it provides, and the data types that each operation requires as inputs and can return in the form of...
