The PLP System

The PLP System

Toshiko Wakaki, Katsumi Inoue, Chiaki Sakama and Katsumi Nitta

Proceedings of the 9th European Conference on Logics in Artificial Intelligence (JELIA'04), Lecture Notes in Artificial Intelligence 3229, Springer-Verlag, pages 706-709, 2004.


Prioritized Logic Programs (PLPs) [Sakama and Inoue, 2000] introduce explicit representation of priorities to logic programs. They realize various types of (prioritized) commonsense reasoning in artificial intelligence including preference abduction [Inoue and Sakama, 1999]. Recently, the authors realize a sound and complete procedure for computing preferred answer sets of a PLP [Wakaki et al, 2003]. The procedure uses techniques of answer set programming (ASP), and also extends the original PLP by accommodating dynamic preferences in the language. The PLP procedure is implemented on top of the ASP solver DLV using C++, and is now running under the Linux/Windows operating systems as ``the PLP system''. The system is available at the URL:, which provides binaries of the current release and the instruction on how to use the system. Some examples are also found there.

Keywords: prioritized logic programming, answer set programming

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