XSB is the name of a dialect of the Prolog programming language and its implementation developed at Stony Brook University in collaboration with the Katholieke Universiteit Leuven, the New University of Lisbon, Uppsala University and software vendor XSB, Inc.
XSB extends Prolog with tabled resolution and HiLog (a standard extension of Prolog permitting limited higher-order logic programming).
The open source XSB implementation includes an interface to the Java programming language.