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