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RELFUN is a logic language primarily extended by call-by-value (eager) functions that may benon-ground, non-deterministic, varying-arity, and higher-order. These functions are defined byextended Horn clauses having a `foot" premise for value returning. This extension can also beviewed as (directed) conditional equations permitting `extra" variables in conditions, which mayaccumulate partial results. It entails the following syntactic changes of PROLOG:Footed clauses: Starting ...

A direct semantic characterization of RELFUN