In numerous works over the past two decades, beginning with the pioneering work of Gruber (1965), Fillmore (1968a), and Jackendoff (1972), it has been argued that each Argument (i.e. Subject or Complement) of a Predicate bears a particular thematic role (alias theta-role, or θ-role to its Predicate), and that the set of thematic functions which Arguments can fulfil are drawn from a highly restricted, finite, universal set.