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MySQL 9.4 Reference Manual

13.4.2 The OpenGIS Geometry Model

13.4.2.1 The Geometry Class Hierarchy
13.4.2.2 Geometry Class
13.4.2.3 Point Class
13.4.2.4 Curve Class
13.4.2.5 LineString Class
13.4.2.6 Surface Class
13.4.2.7 Polygon Class
13.4.2.8 GeometryCollection Class
13.4.2.9 MultiPoint Class
13.4.2.10 MultiCurve Class
13.4.2.11 MultiLineString Class
13.4.2.12 MultiSurface Class
13.4.2.13 MultiPolygon Class

The set of geometry types proposed by OGC'sSQL with Geometry Types environment is based on theOpenGIS Geometry Model. In this model, each geometric object has the following general properties:

It is associated with a spatial reference system, which describes the coordinate space in which the object is defined.
It belongs to some geometry class.

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