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.