<complexType name="PolygonType">
	<annotation>
		<documentation>A Polygon is a special surface that is defined by a single surface patch. The boundary of this patch is coplanar and the polygon uses planar interpolation in its interior. It is backwards compatible with the Polygon of GML 2, GM_Polygon of ISO 19107 is implemented by PolygonPatch.</documentation>
	</annotation>
	<complexContent>
		<extension base="gml:AbstractSurfaceType">
			<sequence>
				<element ref="gml:exterior" minOccurs="0"/>
				<element ref="gml:interior" minOccurs="0" maxOccurs="unbounded"/>
			</sequence>
		</extension>
	</complexContent>
</complexType>