| | |
Summary: Durative Events in Active Databases
Rodolfo G´omez
Computing Laboratory
University of Kent at Canterbury
CT2 7NF, Canterbury, Kent, United Kingdom
rsg2@kent.ac.uk
Juan Carlos Augusto
School of Computing and Mathematics
University of Ulster at Jordanstown
BT37 0QB Newtownabbey, United Kingdom
jc.augusto@ulster.ac.uk
Key words: Active databases, event specification language, durative events, composition operators, composition semantics.
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.
1 INTRODUCTION
|
