Abstract
This paper provides a predicate logic based semantics for active rules in active databases [18], [9]. Our main contribution is a proposal to integrate the specification of active rules with the specification of the dynamics of transaction based change in relational databases. Our approach extends previous work in which the situation calculus, a language of many sorted predicate logic, is used to specify updates in databases [14]. To achieve this, we first specify database transactions in the situation calculus, and then active rules using the notion of occurrence as proposed in [13].
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