Subset-Equational Language
(SEL) A declarative language for set processing by Bharat Jayaraman with subset and equational program clauses; pattern matching over sets (it supports efficient iteration over sets); annotations to say which functions distribute over union in which arguments (for point-wise/incremental computation over sets); defining transitive closures through circular constraints (implemented by mixed top-down/memoisation and bottom-up strategy); meta-programming and simple higher-order programming; modest user-interface including tracing.
The SEL compiler, written in Quintus Prolog, generates WAM-like code, extended to deal with set-matching, memoisation, and the novel control structure of the language. The run-time system is written in C.
ftp://ftp.cs.buffalo.edu/users/bharat/SEL2.
E-mail: Bharat Jayaraman <bharat@cs.buffalo.edu>.
["Towards a Broader Basis for Logic Programming", B. Jayaraman, TR CS Dept, SUNY Buffalo, 1990].
["Set Abstraction in Functional and Logic Programming", F.S.K. Silbermann <fs@cs.tulane.edu> et al, ACM Proc 1989].