B. Arbab et Dm. Berry, SOME COMMENTS ON A DENOTATIONAL SEMANTICS FOR PROLOG, ACM transactions on programming languages and systems, 16(3), 1994, pp. 605-606
Two independently derived denotational semantics for Prolog are contra
sted, Arbab and Berry's for the full language and Nicholson and Foo's
for a databaseless language. Using the ideas suggested by the former,
the latter can be easily extended to include the database operations.