<xs:complexType name="CityObjectGroupParentType">
	<xs:annotation>
		<xs:documentation>Denotes the relation of a CityObjectGroup to its parent, which is a CityObject. The
			CityObjectGroupParentType element must either carry a reference to a _CityObject object or contain a _CityObject object
			inline, but neither both nor none. The parent association allows for modelling of a generic hierarchical grouping concept.
			Named aggregations of components (CityObjects) can be added to specific CityObjects considered as the parent object. The
			parent association links to the aggregate, while the parts are given by the group members. </xs:documentation>
	</xs:annotation>
	<xs:sequence minOccurs="0">
		<xs:element ref="core:_CityObject"/>
	</xs:sequence>
	<xs:attributeGroup ref="gml:AssociationAttributeGroup"/>
</xs:complexType>