<xs:complexType name="TunnelInstallationPropertyType">
	<xs:annotation>
		<xs:documentation>Denotes the relation of a Tunnel to its external installations. The TunnelInstallationPropertyType element
			must either carry a reference to a TunnelInstallation object or contain a TunnelInstallation object inline, but neither
			both nor none. </xs:documentation>
	</xs:annotation>
	<xs:sequence minOccurs="0">
		<xs:element ref="TunnelInstallation"/>
	</xs:sequence>
	<xs:attributeGroup ref="gml:AssociationAttributeGroup"/>
</xs:complexType>