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Subset-equational LanguageThe Subset-equational language (SEL) is a declarative programming language for set processing by Bharat Jayaraman. Features of SEL include: - subset and equational program clauses.
- pattern matching over sets (supporting 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).
- metaprogramming 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.
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