- WSDL is an XML-based language.

- WSDL is used to define the Web Services and also it describes how to access them.

- WSLD is an XML format for describing the network services as a set of endpoints operating on messages containing either document-oriented or procedure-oriented information.

Structure WSDL Document

– Root element

– Provides data type definitions

– Represents the abstract definition of the data being transmitted

– Defines a set of abstract operations

– Specifies concrete protocol and data format specifications for the operations and messages defined by a particular portType.

– Specifies an address for a binding

– Used to aggregate a set of related ports.

A client can invoke a web service using

SOAP,

HTTP

GET/POST and