ATa> A graph consisting of nodes thAT represent physical or conceptual objects and arcs thAT describe the relATionship between the nodes, resulting in something like a dATa flow diagram. Semantic nets are an effective way to represent dATa as they incorporATe the inheritance mechanism thAT prevents duplicATion of dATa. ThAT is, the meaning of a concept comes from its relATionship to other concepts and the informATion is stored by interconnecting nodes with labelled arcs. (1999-01-07)