Prolog facts can contain variables. In DLP, a Prolog fact such as p(X,a). will
be represented explicitly as the rule p(X,a) true.
A query is a formula of the form C, where C is a conjunction. An
update query is a formula of the form D, where D is a dynamic conjunc-
tion. The variables of a query and an update query are assumed to be existen-
tially quantified over the entire conjunction.
Informal
Introduction
to DLP
The semantics and the proof theory of DLP is a proper extension of the seman-
tics and proof theory of Pure Prolog. We will find it convenient to explain the
informal executio ...
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