sumo#collection__physical_collection  such a collection has members like a class, but unlike a class, it has a position in space-time and members can be added and subtracted without thereby changing the identity of the collection; some examples are toolkits, football teams, and flocks of sheep
  supertype:  object__entity_with_spatial_feature  spatial object (space, location or physical object) or description medium/container (e.g., string, language, image); in a 4D ontology, an object is something whose spatiotemporal extent is thought of as dividing into spatial parts roughly parallel to the time-axis
     supertype:  entity  something that can be "involved" in a situation
        supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
     supertype:  physical__physical_thing  an entity that has a location in space-time; locations are themselves understood to have a location in space-time; click here for more details on the identical category sowa#physical_thing
        supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
  supertype:  collection  something gathering separated things (entities/situations)
     supertype:  divisible_entity__divisibleentity  many classifications under this category are application-dependant
        supertype:  entity  something that can be "involved" in a situation
        supertype:  divisible_thing__divisiblething
           supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

No statement uses or specializes collection; click here to add one.