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Computing (FOLDOC) dictionary
Subset-Equational Language
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(SEL) A declarative language for set processing by Bharat
Jayaraman with subset and equational program clauses; patternmatching 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.