<element name="baseSurface" type="gml:SurfacePropertyType">
	<annotation>
		<appinfo>
			<sch:pattern name="Check either href or content not both">
				<sch:rule context="gml:baseSurface">
					<sch:extends rule="hrefOrContent"/>
				</sch:rule>
			</sch:pattern>
		</appinfo>
		<documentation>This property element either references a surface via the XLink-attributes or contains the surface element. A surface element is any element which is substitutable for "_Surface".</documentation>
	</annotation>
</element>