The following CREATE CONSTRAINT request defines values and enforcements for a non-hierarchical (category) classification system, within which the values are independent categories.
CREATE CONSTRAINT classification_category BYTE(8), VALUES (nato:1, united_states:2, canada:3, united_kingdom:4, france:5, norway:6), INSERT SYSLIB.insert_category, UPDATE SYSLIB.update_category, DELETE SYSLIB.delete_category, SELECT SYSLIB.read_category;