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Prolog is excellent for queries on
relational data (as in the Mathematical sense of a "relation"), e.g.,
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born(charles, elizabeth2, philip).
born(anne, elizabeth2, philip).
born(andrew, elizabeth2, philip).
born(edward, elizabeth2, philip).
born(diana, frances, edwardSpencer).
born(william, diana, charles).
born(henry, diana, charles).
? born(S, elizabeth2, Y) and born(G, M, S).
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- NB. The applet above needs Java on.
Also see [aunts and uncles].
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