<complexType name="SolidType">
	<annotation>
		<documentation>A solid is the basis for 3-dimensional geometry. The extent of a solid is defined by the boundary surfaces (shells). A shell is represented by a composite surface, where every  shell is used to represent a single connected component of the boundary of a solid. It consists of a composite surface (a list of orientable surfaces) connected in a topological cycle (an object whose boundary is empty). Unlike a Ring, a Shell's elements have no natural sort order. Like Rings, Shells are simple.</documentation>
	</annotation>
	<complexContent>
		<extension base="gml:AbstractSolidType">
			<sequence>
				<element name="exterior" type="gml:SurfacePropertyType" minOccurs="0">
					<annotation>
						<appinfo>
							<sch:pattern name="Check either href or content not both">
								<sch:rule context="gml:exterior">
									<sch:extends rule="hrefOrContent"/>
								</sch:rule>
							</sch:pattern>
						</appinfo>
						<documentation>Boundaries of solids are similar to surface boundaries. In normal 3-dimensional Euclidean space, one (composite) surface is distinguished as the exterior. In the more general case, this is not always possible.</documentation>
					</annotation>
				</element>
				<element name="interior" type="gml:SurfacePropertyType" minOccurs="0" maxOccurs="unbounded">
					<annotation>
						<appinfo>
							<sch:pattern name="Check either href or content not both">
								<sch:rule context="gml:interior">
									<sch:extends rule="hrefOrContent"/>
								</sch:rule>
							</sch:pattern>
						</appinfo>
						<documentation>Boundaries of solids are similar to surface boundaries.</documentation>
					</annotation>
				</element>
			</sequence>
		</extension>
	</complexContent>
</complexType>