It appears that the fundamental error of regarding functional notions as categorial does not readily tolerate nondistinctness in the sense of distinctive feature theory. Notice, incidentally, that this analysis of a formative as a pair of sets of features suffices to account for the ultimate standard that determines the accuracy of any proposed grammar. Thus the systematic use of complex symbols does not affect the structure of the strong generative capacity of the theory. Analogously, relational information appears to correlate rather closely with a parasitic gap construction. By combining adjunctions and certain deformations, an important property of these three types of EC is, apparently, determined by a general convention regarding the forms of the grammar.
see also: WikiPedia -- Chomskybot