In dynamic e-business environments, companies want to respond rapidly and effectively to events rather than be overtaken by them. Forward-looking companies design their distributed services on event-driven principles. This strategy helps ensure that important events - in applications, systems and components - are communicated in real time to the appropriate parties. Event-notification services let applications specify the types of events they'll publish and subscribe to, the formats in which notifications will be transmitted, and the frequency with which they'll be sent. Until recently the Web services industry lacked open standards for event notification. Last month, two industry groups released rival specifications that address this requirement. One group - BEA Systems, Microsoft and Tibco Software - published a co-authored specification called Web Services Eventing (WS-Eventing); another, led by IBM, released its Web Services Notification (WS-Notification) spec.
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