A flexible parameter-dependent algebra for event notification services

Institut für Informatik
Report B 02-10
June 2002

Annika Hinze, Agnes Voisard
Institut für Informatik
Freie Universität Berlin
Takustr. 9, D-14195 Berlin



Event notification services, or alerting services, are used in various applications such as digital libraries, stock tickers, traffic control, or facility management. However, to our knowledge, a common semantics of events in event notification services has not been defined so far. In this paper, we propose a parameterized event algebra which describes the semantics of composite events for event notifi- cation systems. We define the event operators that form composite events and we introduce parameters for event instance selection and event instance consumption. These parameters serve as a support for handling duplicates in both primitive and composite events. The event algebra is exemplified in the domain of transportation logistics.

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