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WSDL

Web Services Description Language (WSDL) is an XML-based language specification that defines Web services and describes how to access them.

WSDL is used to explain the details needed to invoke a Web service over the Internet. WSDL defines XML syntax for describing services between a set of endpoints, usually a client and server, that exchange messages. This documentation can then act as a road map for automating the details of a Web service. WSDL describes the service interaction rather than the formats or network protocols used to communicate. It simply defines the endpoints and their data, regardless of the implementation detail. Early Web services existed without SOAP or WSDL and required constant communication among developers creating and consuming Web services. They needed to know what parameters and data types a Web service's function required, as well as how to encode and decode XML so as to convert one platform's complex data types to another's.


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