gml:EngineeringDatumPropertyType is a property type for association roles to an engineering datum, either referencing or containing the definition of that datum.
<complexType name="EngineeringDatumPropertyType"><annotation><documentation>gml:EngineeringDatumPropertyType is a property type for association roles to an engineering datum, either referencing or containing the definition of that datum.</documentation></annotation><sequence minOccurs="0"><element ref="gml:EngineeringDatum"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>