(mysql.info) gis-class-surface

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 16.2.6 Class `Surface'
 ----------------------
 
 A `Surface' is a two-dimensional geometry. It is a non-instantiable
 class. Its only instantiable subclass is `Polygon'.
 
 *`Surface' Properties*
 
    * A `Surface' is defined as a two-dimensional geometry.
 
    * The OpenGIS specification defines a simple `Surface' as a geometry
      that consists of a single `patch' that is associated with a single
      exterior boundary and zero or more interior boundaries.
 
    * The boundary of a simple `Surface' is the set of closed curves
      corresponding to its exterior and interior boundaries.
 

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(mysql.info) gis-class-linestring

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