relational language

language Relational languages specify output in terms of

some property and some arguments. For example, if Tom has two

brothers, Dick and Harry, a relational language will respond

to the query "Who is Tom's brother?" with either Dick or

Harry. Notice that unlike functional languages, relational

languages do not require a unique output for each

predicate/argument pair. Prolog is the best known

relational language.

(1995-03-31)