2.2.1.22 GeographyCollection

The GeographyCollection type represents a Geography that is defined as the union of a set of Geography instances. GeographyCollection is not equality comparable, so it cannot be used in keys. The meaning of a GeographyCollection is as the meaning of GeometryCollection in the OGC Simple Features specification ([OGC-SFACA/1.2.1] section 6.1.3), but for ellipsoidal coordinates.