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Entity > Abstract > Class > Relation > BinaryRelation > BinaryPredicate > refers
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refers comparison table
Subject have domain2 have domain1 documentation is a kind of is an instance of
BinaryPredicate  A Predicate relating two items - its valence is twoPredicate 
refersEntityPhysical(refers ?OBJ1 ?OBJ2) means that ?OBJ1 mentions or includes a reference to ?OBJ2. Note that refers is more general in meaning than represents, because presumably something can represent something else only if it refers to this other thing. For example, an article whose topic is a recent change in the price of oil may refer to many other things, e.g. the general state of the economy, the weather in California, the prospect of global warming, the options for alternative energy sources, the stock prices of various oil companies, etc BinaryPredicate

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