March 7, 2003

Web Services Description Language (WSDL) provides a model and an XML format for describing Web services. WSDL enables one to separate the description of the abstract functionality offered by a service from concrete details of a service description such as "how" and "where" that functionality is offered.

This specification defines a language for describing the abstract functionality of a service as well as a framework for describing the concrete details of a service description. The companion specification, WSDL Version 1.2: Bindings [WSDL 1.2 Bindings] defines a language for describing such concrete details for SOAP 1.2 [SOAP 1.2 Part 1: Messaging Framework], HTTP [IETF RFC 2616] and MIME [IETF RFC 2045].

WSDL describes Web services starting with the messages that are exchanged between the service provider and requestor. The messages themselves are described abstractly and then bound to a concrete network protocol and message format. A message consists of a collection of typed data items.

An exchange of messages between the service provider and requestor are described as an operation. A collection of operations is called a port type. A service contains a collection of ports, where each port is an implementation of a portType, which includes all the concrete details needed to interact with the service.

Source: Web Services.org

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