(mysql.info) gis-class-polygon

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(mysql.info) gis-class-surface

(mysql.info) opengis-geometry-model

(mysql.info) gis-class-geometrycollection

 
 16.2.7 Class `Polygon'
 ----------------------
 
 A `Polygon' is a planar `Surface' representing a multisided geometry.
 It is defined by a single exterior boundary and zero or more interior
 boundaries, where each interior boundary defines a hole in the
 `Polygon'.
 
 *`Polygon' Examples*
 
    * On a region map, `Polygon' objects could represent forests,
      districts, and so on.
 
 *`Polygon' Assertions*
 
    * The boundary of a `Polygon' consists of a set of `LinearRing'
      objects (that is, `LineString' objects that are both simple and
      closed) that make up its exterior and interior boundaries.
 
    * A `Polygon' has no rings that cross. The rings in the boundary of
      a `Polygon' may intersect at a `Point', but only as a tangent.
 
    * A `Polygon' has no lines, spikes, or punctures.
 
    * A `Polygon' has an interior that is a connected point set.
 
    * A `Polygon' may have holes. The exterior of a `Polygon' with holes
      is not connected.  Each hole defines a connected component of the
      exterior.
 
 The preceding assertions make a `Polygon' a simple geometry.
 

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(mysql.info) gis-class-surface

(mysql.info) opengis-geometry-model

(mysql.info) gis-class-geometrycollection