GeometryCollection is a geometry that is
a collection of one or more geometries of any class.
All the elements in a
must be in the same Spatial Reference System (that is, in the
same coordinate system). There are no other constraints on the
elements of a
the subclasses of
described in the following sections may restrict membership.
Restrictions may be based on:
Element type (for example, a
may contain only
Constraints on the degree of spatial overlap between elements