gml:UserDefinedCSPropertyType is a property type for association roles to a user-defined coordinate system, either referencing or containing the definition of that coordinate system.
<complexType name="UserDefinedCSPropertyType"><annotation><documentation>gml:UserDefinedCSPropertyType is a property type for association roles to a user-defined coordinate system, either referencing or containing the definition of that coordinate system.</documentation></annotation><sequence minOccurs="0"><element ref="gml:UserDefinedCS"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>