<xs:complexType name="AbstractBoundarySurfaceType" abstract="true">
	<xs:annotation>
		<xs:documentation>A BoundarySurface is a thematic object which classifies surfaces bounding an _AbstractBridge,
			BridgeInstallation, IntBuildingInstallation, BridgeConstructionElement, and BridgeRoom. The geometry of a BoundarySurface
			is given by MultiSurfaces. As it is a subclass of _CityObject, it inherits all atributes and relations, in particular the
			external references, the generic attributes, and the generalization relations. </xs:documentation>
	</xs:annotation>
	<xs:complexContent>
		<xs:extension base="core:AbstractCityObjectType">
			<xs:sequence>
				<xs:element name="lod2MultiSurface" type="gml:MultiSurfacePropertyType" minOccurs="0"/>
				<xs:element name="lod3MultiSurface" type="gml:MultiSurfacePropertyType" minOccurs="0"/>
				<xs:element name="lod4MultiSurface" type="gml:MultiSurfacePropertyType" minOccurs="0"/>
				<xs:element name="opening" type="OpeningPropertyType" minOccurs="0" maxOccurs="unbounded"/>
				<xs:element ref="_GenericApplicationPropertyOfBoundarySurface" minOccurs="0" maxOccurs="unbounded"/>
			</xs:sequence>
		</xs:extension>
	</xs:complexContent>
</xs:complexType>