• ST_Surface type

• ST_Polygon type

• ST_CurvePolygon constructor

• ST_CurvePolyToPoly method for type ST_CurvePolygon
• ST_ExteriorRing method for type ST_CurvePolygon
• ST_InteriorRingN method for type ST_CurvePolygon
• ST_NumInteriorRing method for type ST_CurvePolygon
• All methods of ST_Surface type can also be called on a ST_CurvePolygon type.
• All methods of ST_Geometry type can also be called on a ST_CurvePolygon type.

An ST_CurvePolygon represents a planar surface defined by one exterior ring and zero or more interior rings that represent holes in the surface. The exterior and interior rings of an ST_CurvePolygon can be any ST_Curve value. For example, a circle is an ST_CurvePolygon with an ST_CircularString exterior ring representing the boundary. No two rings in an ST_CurvePolygon can intersect except possibly at a single point. Further, an ST_CurvePolygon cannot have cut lines, spikes, or punctures.

The interior of every ST_CurvePolygon is a connected point set.