Of course, this selectionally introduced contextual feature does not readily tolerate problems of phonemic and morphological analysis. Nevertheless, any associated supporting element delimits the traditional practice of grammarians. A consequence of the approach just outlined is that the systematic use of complex symbols is, apparently, determined by a stipulation to place the constructions into these various categories. With this clarification, the earlier discussion of deviance is not to be considered in determining nondistinctness in the sense of distinctive feature theory. We will bring evidence in favor of the following thesis: a descriptively adequate grammar suffices to account for a parasitic gap construction.
see also: WikiPedia -- Chomskybot