(mysql.info) gis-class-multipolygon

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(mysql.info) gis-class-multisurface

(mysql.info) opengis-geometry-model

 
 16.2.13 Class `MultiPolygon'
 ----------------------------
 
 A `MultiPolygon' is a `MultiSurface' object composed of `Polygon'
 elements.
 
 *`MultiPolygon' Examples*
 
    * On a region map, a `MultiPolygon' could represent a system of
      lakes.
 
 *`MultiPolygon' Assertions*
 
    * A `MultiPolygon' has no two `Polygon' elements with interiors that
      intersect.
 
    * A `MultiPolygon' has no two `Polygon' elements that cross
      (crossing is also forbidden by the previous assertion), or that
      touch at an infinite number of points.
 
    * A `MultiPolygon' may not have cut lines, spikes, or punctures. A
      `MultiPolygon' is a regular, closed point set.
 
    * A `MultiPolygon' that has more than one `Polygon' has an interior
      that is not connected. The number of connected components of the
      interior of a `MultiPolygon' is equal to the number of `Polygon'
      values in the `MultiPolygon'.
 
 *`MultiPolygon' Properties*
 
    * A `MultiPolygon' is a two-dimensional geometry.
 
    * A `MultiPolygon' boundary is a set of closed curves (`LineString'
      values) corresponding to the boundaries of its `Polygon' elements.
 
    * Each `Curve' in the boundary of the `MultiPolygon' is in the
      boundary of exactly one `Polygon' element.
 
    * Every `Curve' in the boundary of an `Polygon' element is in the
      boundary of the `MultiPolygon'.
 

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(mysql.info) gis-class-multisurface

(mysql.info) opengis-geometry-model