<xs:complexType name="AbstractCityObjectType" abstract="true">
	<xs:annotation>
		<xs:documentation>Type describing the abstract superclass of most CityGML features. Its purpose is to provide a creation and
			a termination date as well as a reference to corresponding objects in other information systems. A generalization relation
			may be used to relate features, which represent the same real-world object in different Levels-of-Detail, i.e. a feature
			and its generalized counterpart(s). The direction of this relation is from the feature to the corresponding generalized
			feature.</xs:documentation>
	</xs:annotation>
	<xs:complexContent>
		<xs:extension base="gml:AbstractFeatureType">
			<xs:sequence>
				<xs:element name="creationDate" type="xs:date" minOccurs="0"/>
				<xs:element name="terminationDate" type="xs:date" minOccurs="0"/>
				<xs:element name="externalReference" type="ExternalReferenceType" minOccurs="0" maxOccurs="unbounded"/>
				<xs:element name="generalizesTo" type="GeneralizationRelationType" minOccurs="0" maxOccurs="unbounded"/>
				<xs:element name="relativeToTerrain" type="RelativeToTerrainType" minOccurs="0"/>
				<xs:element name="relativeToWater" type="RelativeToWaterType" minOccurs="0"/>
				<xs:element ref="_GenericApplicationPropertyOfCityObject" minOccurs="0" maxOccurs="unbounded"/>
			</xs:sequence>
		</xs:extension>
	</xs:complexContent>
</xs:complexType>