A consequence of the approach just outlined is that the natural general principle that will subsume this case can be defined in such a way as to impose the strong generative capacity of the theory. From C1, it follows that any associated supporting element does not affect the structure of nondistinctness in the sense of distinctive feature theory. So far, relational information delimits the ultimate standard that determines the accuracy of any proposed grammar. However, this assumption is not correct, since the appearance of parasitic gaps in domains relatively inaccessible to ordinary extraction is rather different from a stipulation to place the constructions into these various categories. With this clarification, the systematic use of complex symbols may remedy and, at the same time, eliminate a parasitic gap construction.
see also: WikiPedia -- Chomskybot