- 11.5.2.1 The Geometry Class Hierarchy
- 11.5.2.2
`Geometry`

Class - 11.5.2.3
`Point`

Class - 11.5.2.4
`Curve`

Class - 11.5.2.5
`LineString`

Class - 11.5.2.6
`Surface`

Class - 11.5.2.7
`Polygon`

Class - 11.5.2.8
`GeometryCollection`

Class - 11.5.2.9
`MultiPoint`

Class - 11.5.2.10
`MultiCurve`

Class - 11.5.2.11
`MultiLineString`

Class - 11.5.2.12
`MultiSurface`

Class - 11.5.2.13
`MultiPolygon`

Class

The set of geometry types proposed by OGC's
**SQL with Geometry Types**
environment is based on the **OpenGIS
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.