• Class

NonUnityClass, UnityClass

Collection, CompleteObject, CompleteStructure, DerivedEntity, LandDivision, MaterialEntity, MaterialSpatialEntity, MethodologicalEntity, NaturalObject, NaturalStructure, NonMaterialSpatialEntity, ObjectEntity, Part, ParthoodConcept, PrimaryEntity, ProducedObject, ProducedStructure, Sample, SpatialEntity, StratigraphicEntity, StratigraphicSequence, TangibleEntity, ValuableEntity

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