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Specifies the interface and defines the SOAP binding style ( RPC/Document) and transport ( SOAP Protocol).

It is typically represented by a simple HTTP URL string. For example, the version 2.0 of the Business Process Execution Language (BPEL) only supports WSDL 1.1.Ĭontains a set of system functions that have been exposed to the Web-based protocols.ĭefines the address or connection point to a Web service. However support for this specification is still poor in software development kits for Web Services which often offer tools only for WSDL 1.1. By accepting binding to all the HTTP request methods (not only GET and POST as in version 1.1), the WSDL 2.0 specification offers better support for RESTful web services, and is much simpler to implement. WSDL 1.2 was renamed WSDL 2.0 because of its substantial differences from WSDL 1.1. The current version of the specification is 2.0 version 1.1 has not been endorsed by the W3C but version 2.0 is a W3C recommendation. The client can then use SOAP to actually call one of the operations listed in the WSDL file, using for example XML over HTTP.

Any special datatypes used are embedded in the WSDL file in the form of XML Schema. A client program connecting to a Web service can read the WSDL file to determine what operations are available on the server. WSDL is often used in combination with SOAP and an XML Schema to provide Web services over the Internet. In this way, WSDL describes the public interface to the Web service. The concrete protocol and data format specifications for a particular port type constitutes a reusable binding, where the operations and messages are then bound to a concrete network protocol and message format. Messages are abstract descriptions of the data being exchanged, and port types are abstract collections of supported operations.

A port is defined by associating a network address with a reusable binding, and a collection of ports defines a service.

The abstract definitions of ports and messages are separated from their concrete use or instance, allowing the reuse of these definitions. The WSDL specification provides an XML format for documents for this purpose. The WSDL describes services as collections of network endpoints, or ports. Representation of concepts defined by WSDL 1.1 and WSDL 2.0 documents.