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A collection of collections and a specialization of ObjectType (q.v.). Each instance of SpatiallyDisjointObjectType is a collection C of spatial things (see SpatialThing), where each of the spatial things in C is spatially disjoint with the other spatial things in C. For example, the collection Dog is an instance of SpatiallyDisjointObjectType, since dogs do not spatially overlap. Even pregnant dogs do not spatially overlap the pups they bear; rather, pregnant dogs contain their unborn pups. Other instances of SpatiallyDisjointObjectType include LatitudeLine, CompactDisc_Audio, and PlanetaryBody. An important specialization of SpatiallyDisjointObjectType is SpatiallyDisjointRegionType (a collection of specializations of GeographicalRegion, such as City and TrueContinent).