OBJ (programming language)

OBJ is a programming language family introduced by Joseph Goguen in 1976, and further worked on by Jose Meseguer.

Overview

It is a family of declarative "ultra high-level" languages. It features abstract types, generic modules, subsorts (subtypes with multiple inheritance), pattern-matching modulo equations, E-strategies (user control over laziness), module expressions (for combining modules), theories and views (for describing module interfaces) for the massively parallel RRM (rewrite rule machine).^[1]

Members of the OBJ family of languages include CafeOBJ, Eqlog, FOOPS, Kumo, Maude, OBJ2, and OBJ3.^[2]

OBJ2 is a programming language with Clear-like parametrised modules and a functional system based on equations.

OBJ3 is a version of OBJ based on order-sorted rewriting. OBJ3 is agent-oriented and runs on Kyoto Common Lisp AKCL.

^ This article is based on material taken from OBJ at the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.
^ The OBJ family

J. A. Goguen, Higher-Order Functions Considered Unnecessary for Higher-Order Programming. In Research Topics in Functional Programming (June 1990). pp. 309–351.
"Principles of OBJ2", K. Futatsugi et al., 12th POPL, ACM 1985, pp. 52–66.
J. A. Goguen; T. Winkler; J. Meseguer; K. Futatsugi; J.-P. Jouannaud (2000), "Introducing OBJ", in J. A. Goguen; G. Malcolm (eds.), Software Engineering with OBJ: Algebraic Specification in Action, Springer Science+Business Media, New York, NY, pp. 3–167, ISBN 978-1-4757-6541-0

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