12.18.2.13. Class MultiPolygon

On a region map, a MultiPolygon could represent a system of lakes.

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.

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.