A note on the complexity of the satisfiability of modal Horn clauses
Journal of Logic Programming
Theoretical Computer Science
First-order modal logic
Constructing the least models for positive modal logic programs
Fundamenta Informaticae
linear time datalob and branching time logic
Logic-based artificial intelligence
The Modal Query Language MDatalog
Fundamenta Informaticae
ADBIS'05 Proceedings of the 9th East European conference on Advances in Databases and Information Systems
Foundations of Modal Deductive Databases
Fundamenta Informaticae
Foundations of Modal Deductive Databases
Fundamenta Informaticae
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We study the data complexity of the modal query language MDatalog and its extension eMDatalog in basic modal logics. MDatalog is a modal extension of Datalog, while eMDatalog is the general modal Horn fragment with the allowedness condition. As the main results, we prove that the data complexity of MDatalog and eMDatalog in K4, KD4, and S4 is PSPACE-complete, in K is coNP-complete, and in KD, T, KB, KDB, and B is PTIME-complete.