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Computing (FOLDOC) dictionary
relational language
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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.