WSDL is an XML document that contains a set of definitions that describes a Web Service. It provides all the information needed to access and use a Web Service. A WSDL document describes what the Web ...

WSDL 1.2 is an XML-based language that describes a Web Service (the data exchanged, the protocol to use and its location on the Web). WSDL 1.2 Bindings describes how to use WSDL 1.2 with SOAP 1.2 ...

With a WSDL implementation, programs can understand what types of data are transferred and how to use the data. Microsoft has aggressively pushed key .NET specifications to the W3C.