WS-Notification enables Web services to use the "publish and subscribe" messaging pattern.. This approach offers many business benefits.
WS-Notification provides a standardized approach for Web service applications to participate in the publish and subscribe messaging pattern, whether this be listening for notification of a particular event occurrence, or inserting event notifications into the system for consumption by other applications or system management tooling. The open-standards nature of this Web services specification mean that applications can communicate with each other irrespective of the underlying hardware platforms, software languages or vendor environments.
Within WebSphere Application Server, the NotificationBroker is implemented to provide flexible support for enterprise topologies including high availability and work load management patterns. This support for WS-Notification also allows interchange of event notification between WS-Notification applications and other clients of the service integration bus. By exploiting other service integration bus functionality you can also use this function to interchange messages with other IBM publish and subscribe brokers such as WBI Event Broker or Message Broker.