(mysql.info) opengis-geometry-model

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 16.2 The OpenGIS Geometry Model
 ===============================
 

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* gis-geometry-class-hierarchy  The Geometry Class Hierarchy
* gis-class-geometry           Class `Geometry'
* gis-class-point              Class `Point'
* gis-class-curve              Class `Curve'
* gis-class-linestring         Class `LineString'
* gis-class-surface            Class `Surface'
* gis-class-polygon            Class `Polygon'
* gis-class-geometrycollection  Class `GeometryCollection'
* gis-class-multipoint         Class `MultiPoint'
* gis-class-multicurve         Class `MultiCurve'
* gis-class-multilinestring    Class `MultiLineString'
* gis-class-multisurface       Class `MultiSurface'
* gis-class-multipolygon       Class `MultiPolygon'
 
 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.
 

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