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Proof procedure and answer extraction in Petri net model of logic programs

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2 Author(s)
Peterka, G. ; Dept. of Electr. Eng. & Comput. Sci., Illinois Univ., Chicago, IL, USA ; Murata, T.

A proof procedure and answer extraction in a high-level Petri net model of logic programs is discussed. The logic programs are restricted to the Horn clause subset of first-order predicate logic and finite problems. The logic program is modeled by a high-level Petri net and the execution of the logic program or the answer extraction process in predicate calculus corresponds to a firing sequence which fires the goal transition in the net. For the class of the programs described above, the goal transition is potentially firable if an only if there exists a nonnegative T-invariant which includes the goal transition in its support. This is the main result proved. Three examples are given to illustrate in detail the above results

Published in:

Software Engineering, IEEE Transactions on  (Volume:15 ,  Issue: 2 )