XML List based on the union type defined above. An element declared with this type contains a space-separated list of integer
values with null values interspersed as needed
<simpleType name="integerOrNullList"><annotation><documentation>XML List based on the union type defined above. An element declared with this type contains a space-separated list of integer values with null values interspersed as needed</documentation></annotation><list itemType="gml:integerOrNull"/></simpleType>