WS-EventNotification

The WS-EventNotification specification is in development and is expected to extend aspects of several standards, including those described next: WS-Notification and WS-Eventing.

WS-Notification

Document:	Web Services Base Notification and related specifications
Purpose:	To specify how an SOA runtime product handles a publish-and-subscribe pattern between a requester (which acts as a subscriber, asking to be notified of an event) and a service (which sends the requested detail when the event occurs, either directly or by way of a separate software unit called a notification broker). An event could be (for example) a printer failure or the addition of an entry in an online forum. WS-Notification provides support for large-scale or complicated applications.
Sponsor:	OASIS
Link:	Specifications for WS-BaseNotification, WS-BrokeredNotification, and WS-Topics are available: http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=wsn

WS-Eventing

Document:	Web Services Eventing (WS-Eventing)
Purpose:	To specify how an SOA runtime product handles a publish-and-subscribe pattern between a requester (which acts as a subscriber, asking to be notified of an event) and a service (which sends the requested detail when the event occurs). WS-Eventing is a relatively simple publish-and-subscribe specification.
Sponsor:	Several corporations
Link:	http://www.ibm.com/developerworks/library/specification/ws-eventing