Given the terminology we have introduced here, we can say that all of the bracketed phrases in (3) above are of the schematic form (4) below:

(4) Specifier + Head + Complement

Now, we have already argued in the case of Noun Phrases that a Head Noun together with its Complement form an N-bar; and that this N-bar together with its Specifier ( = Determiner) forms an N-double-bar.