DLV is an efficient logic programming and non-monotonic reasoning (LPNMR) system with advanced knowledge representation mechanisms and interfaces to classic relational database systems. Its core language is disjunctive datalog (function-free disjunctive logic programming) under the Answer Set Semantics with integrity constraints, both default and strong (or explicit) negation, and queries. Integer arithmetics and various built-in predicates are also supported. In addition DLV has several frontends, namely brave and cautious reasoning, abductive diagnosis, consistency-based diagnosis, a subset of SQL3, planning with action languages, and logic programming with inheritance.
@article{arxiv.cs/0003036,
title = {DLV - A System for Declarative Problem Solving},
author = {Thomas Eiter and Wolfgang Faber and Christoph Koch and Nicola Leone and Gerald Pfeifer},
journal= {arXiv preprint arXiv:cs/0003036},
year = {2007}
}