Geometry
A Geometry object represents points, curves, and surfaces in coordinate space. Every Geometry object is a GeoJSON object no matter where it occurs in a GeoJSON text.
o The value of a Geometry object's "type" member MUST be one of the
seven geometry types
o A GeoJSON Geometry object of any type other than
"GeometryCollection" has a member with the name "coordinates".
The value of the "coordinates" member is an array. The structure
of the elements in this array is determined by the type of
geometry. GeoJSON processors MAY interpret Geometry objects with
empty "coordinates" arrays as null objects.
https://datatracker.ietf.org/doc/html/rfc7946#section-3.1
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