This paper proposes an update language called Datalog/UT which
extends Datalog by incorporating update rules with temporal information.
Programs to update example Databases are given. The semantics of
Datalog/UT are described. Datalog/UT has a declarative semantics using local
stratification which is a natural and direct extension of the traditional
Datalog semantics and reduces to it in the special case. This is achieved
by using explicit temporal information to control the update operations
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