<xs:complexType name="OpeningPropertyType">
	<xs:annotation>
		<xs:documentation>Denotes the relation of an _BondarySurface to its openings (doors, windows). The OpeningPropertyType
			element must either carry a reference to an _Opening object or contain an _Opening object inline, but neither both nor
			none. </xs:documentation>
	</xs:annotation>
	<xs:sequence minOccurs="0">
		<xs:element ref="_Opening"/>
	</xs:sequence>
	<xs:attributeGroup ref="gml:AssociationAttributeGroup"/>
</xs:complexType>