Interface for the
All geometry elements are derived directly or indirectly from this abstract supertype. A geometry
element may have an identifying attribute ("gml:id"), a name (attribute "name") and a description
(attribute "description"). It may be associated with a spatial reference system (attribute
"srsName"). The following rules shall be adhered: - Every geometry type shall derive from this
abstract type. - Every geometry element (i.e. an element of a geometry type) shall be directly or
indirectly in the substitution group of _Geometry.
(GML Specification, v3.1.0, paragraph 188.8.131.52)