rdf_db:rdf_reachable/5

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Predicate rdf_reachable/5

rdf_reachable(?Subject, +Predicate, ?Object, +MaxD, -D) is nondet: Same as rdf_reachable/3, but in addition, MaxD limits the number of edges expanded and D is unified with the `distance' between Subject and Object. Distance 0 means Subject and Object are the same resource. MaxD can be the constant infinite to impose no distance-limit.