equivalent to the semantics of parallel circumscription (with all predicates
minimized) (McCarthy [1980], Lifschitz [1985a]). This leads to the following
principle, generalizing Principle 1.
PRINCIPLE
2
(PRINCIPLE
OF
MINIMAL MODEL SEMANTICS)
The set MIN(DB) of all minimal models of a positive disjunctive database DB
provides intended semantics of DB, incorporating a suitable form of the closed-
world assumption. •
Minimal Model Semantics
Is Not
Sufficient
for
General Databases
The expressive power of positive disjunctive databases is not sufficient for
general databases. In practica ...
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