Authors:
Rodolfo Gómez
1
and
Juan Carlos Augusto
2
Affiliations:
1
Computing Laboratory, University of Kent at Canterbury, United Kingdom
;
2
School of Computing and Mathematics, University of Ulster at Jordanstown, United Kingdom
Keyword(s):
Active databases, event specification language, durative events, composition operators, composition semantics.
Related
Ontology
Subjects/Areas/Topics:
Databases and Information Systems Integration
;
Deductive, Active, Temporal and Real-Time Databases
;
Enterprise Information Systems
Abstract:
Active databases are DBMS which are able to detect certain events in the environment and trigger actions in consequence. Event detection has been subject of much research, and a number of different event specification languages is extant. However, this is far from being a trivial or accomplished task. Most of these languages handle just instantaneous events, but it has been noticed that a number of situations arise where it would be interesting or even necessary to handle durative events. We elaborate on a given specification language which combines instantaneous and durative events, revealing some issues which must be taken into account when the semantics of event composition is defined.