|Version 4 (modified by acharal, 12 months ago)|
Welcome to Higher Order Prolog with Extensional Semantics
For more information about the formal definition of the language and its semantics you should consult this paper.
Getting Started with the Interpreter
To checkout the source from the darcs repository you should execute
darcs get http://code.haskell.org/hopes hopes
To compile the source you must install the cabal package and execute
In order to gain some intuition behind logic programming in HOPES some simple examples are given.
The ordered predicate is the simple second-order predicate that holds if the relation R is an ordering of the list.
ordered(R, ). ordered(R, [X]). ordered(R, [X, Y| Z]):- R(X,Y), ordered(R, [Y|Z]).
The popular map predicate:
map(R, , ). map(R, [X|Xs], [Y|Ys]) :- R(X, Y), map(R, Xs, Ys).