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In this paper we shall consider proofs of declarative properties of Logic Programs, i.e. properties associated with the logical semantics of pure Logic Programs, in particular what is called the partial correctness of a logic program with respect to a specification. A specification consists of a logical formula associated with each predicate and establishing a relation between its arguments. A definite clause program is partially correct iff every possible answer substitution satisfies the specification.

Proofs of declarative properties of logic programs