 It is however unclear as to whether Joseph Raz, an avowed hard positivist, can be classified as conventionalist as Raz has claimed that law is composed "exclusively" of social facts which could be complex, and thus difficult to be discovered.In particular, Dworkin has characterized law as having the main function of restraining state's coercion.Nigel Simmonds has rejected Dworkin's disapproval of conventionalism, claiming that his characterization of law is too narrow.