The Free On-line Dictionary of Computing (30 December 2018):

XSB

    XSB extends the standard functionality of
   Prolog (being a descendant of PSB- and SB-Prolog) to include
   implementations of OLDT (tabling) and HiLog terms.  OLDT
   resolution is extremely useful for recursive query
   computation, allowing programs to terminate correctly in many
   cases where Prolog does not.  HiLog supports a type of
   higher-order programming in which predicate symbols can be
   variable or structured. This allows unification to be
   performed on the predicate symbols themselves in addition to
   the arguments of the predicates.  Of course, Tabling and HiLog
   can be used together.

   Version 1.2

   ports: Sun, Solaris, NeXT, Linux, 386 BSD, IRIX, HP-UX

   portability:	Generally to 32-bit machines.

   interpreter, preprocessor(HiLog), documentation

   XSB research group / SUNY at Stony Brook

   (ftp://sbcs.sunysb.edu/pub/XSB/XSB.tar.Z).

   (130.245.1.15) E-mail: .

   (1993-07-28)