new use case DS23: event/notification

DS23:  An application subscribes to notifications of certain named events from an event source. 
When such events occur, notifications are sent back to the originating application (first party notification) 
or to another application (third party notification). For example, an application can subscribe to notification of
various aspects of a printer's status (e.g., running out of paper, ink etc.). The notifications of such events could 
be delivered to a management application.

Based on: See item 2 of http://lists.w3.org/Archives/Public/xml-dist-app/2001Jan/0070.html 


Nilo Mitra			phone:+1 212-295-8467
Ericsson			fax: +1 212-295-8489
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