equivalentContentClass | ContentBearingObject | ContentBearingObject | A BinaryPredicate that relates two subclasses of ContentBearingObject. (equivalentContentClass ?CLASS1 ?CLASS2) means that the content expressed by each instance of ?CLASS1 is also expressed by each instance of ?CLASS2, and vice versa. An example would be the relationship between English and Russian editions of Agatha Christie's 'Murder on the Orient Express'. Note that (equivalentContentClass ?CLASS1 ?CLASS2) implies (subsumesContentClass ?CLASS1 ?CLASS2) and (subsumesContentClass ?CLASS2 ?CLASS1) | (<=> (and (subsumesContentClass ?CLASS1 ?CLASS2) (subsumesContentClass ?CLASS2 ?CLASS1)) (equivalentContentClass ?CLASS1 ?CLASS2))
| | EquivalenceRelation |