GeometryCollection is a geometry that is a
collection of one or more geometries of any class.
All the elements in a
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
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