Programming by Combining General Logic Programs

Brogi, Antonio and Contiero, Simone and Turini, Franco (1997) Programming by Combining General Logic Programs. Technical Report del Dipartimento di Informatica . Università di Pisa, Pisa, IT.

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Abstract

The program composition approach can be fruitfully applied to combine general logic programs, i.e. logic programs possibly containing negative premises. We show how the introduction of a basic set of (meta-level) composition operations over general programs increases the knowledge representation capabilities of logic programming for non-monotonic reasoning. Examples of modular programming, hierarchical reasoning, constraints and rules with exceptions will be illustrated. The semantics of programs and program compositions is defined in terms of three-valued logic. The computational interpretation of program compositions is formalised by an equivalence preserving syntactic transformation of arbitrary program compositions into standard general programs.

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