In the JBI environment, the provider and consumer always interact based on a services model. A service interface is the common aspect between them. WSDL 1.1 and 2.0 are used to define the contract through the services interface.

The following figure represents the two parts of the WSDL representation of a service:

In the Abstract Model, WSDL describes the propagation of a message through a type system. A message has sequence and cardinality specified by its Message Exchange Pattern (MEP). A Message can be a Fault Message also. An MEP is associated with one or more messages using an Operation. An Interface can contain a single Operation or a group of Operations represented in an abstract fashion—independent of wire formats and transport protocols.

An Interface in the Abstract Model is bound to a specific wire format and transport protocol via Binding. A Binding is associated with a network address in an Endpoint and a single Service in the concrete model aggregates...