Web Services: WSDL Transmission Primitives

WSDL has four transmission primitives that an endpoint can support:

1. One-way. The endpoint receives a message.
2. Request-response. The endpoint receives a message, and sends a correlated message.
3. Solicit-response. The endpoint sends a message, and receives a correlated message.
4. Notification. The endpoint sends a message.
   

• Although the base WSDL structure supports bindings for these four transmission primitives, WSDL only defines bindings for the One-way and Request-response primitives.

• It is expected that specifications that define the protocols for Solicit-response or Notification would also include WSDL binding extensions that allow use of these primitives.