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SYNTAX: maximal projection of COMP (C0). CP is in part an reconstruction in X-bar theory of the category S' (or S-bar). Thus the (anomalous) structure generated in (i) (see Chomsky 1981) is replaced by the X-bar structure generated in (ii) (see Chomsky 1986b).

(i)	S'	->	COMP S

(ii) a	CP	->	spec,CP  C'
     b	C'	->	C  IP
Under (i) COMP contains both wh-phrases and the complementizer; under (ii) C is the complementizer position, and spec,CP the position of the wh-phrases.
LIT. Chomsky, N. (1986b)
Chomsky, N. (1986a)