• Class

DependentClass, NonDependentClass

CompleteObject, CompleteStructure, Deposit, DerivedEntity, LandDivision, MaterialAspect, MaterialEntity, MaterialSpatialEntity, Matter, MethodologicalEntity, NaturalObject, NaturalStructure, NonMaterialSpatialEntity, ObjectEntity, PrimaryEntity, ProducedObject, ProducedStructure, SpatialEntity, StratigraphicEntity, StratigraphicSequence, TangibleEntity, ValuableEntity

• Class ≡ NonDependentClass or DependentClass and RigidClass or NonRigidClass and SortalClass or NonSortalClass and UnityClass or NonUnityClass