Clearly, the fundamental error of regarding functional notions as categorial can be defined in such a way as to impose problems of phonemic and morphological analysis. To provide a constituent structure for T(Z,K), the theory of syntactic features developed earlier is rather different from a descriptive fact. Thus the descriptive power of the base component does not readily tolerate an important distinction in language use. From C1, it follows that a case of semigrammaticalness of a different sort delimits the system of base rules exclusive of the lexicon. By combining adjunctions and certain deformations, the earlier discussion of deviance is unspecified with respect to a stipulation to place the constructions into these various categories.
see also: WikiPedia -- Chomskybot