WSDL - Web services framework that describes how to connect to Web services providers.
WSDL -XML format- describing how one software system can connect and utilize the services of another software system over the Internet.
WSDL uses XML-based syntax -describe the specifics of accessing a Web service,
such as
type , number of parameters passed to a service, type and structure of the result returned.
After discovering -Web service (via UDDI),
WSDL provides the details of how to actually bind and interact with that service.
WSDL supports direct client interaction with a Web service provider by building on the infrastructure provided by HTTP and SOAP.
WSDL ports define data bindings.
WSDL defines services as collections of network endpoints or ports.
Figure 5.4 illustrates that in WSDL the abstract definition of endpoints and messages is separated from their concrete network-based data bindings.
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