In this chapter we have introduced the structure of the DP, the projection of a functional category. We will contrast this in the next chapter with the VP, which is obviously the projection of a thematic category. As far as the X-bar structure is concerned, the two are very similar. But, as we know, lexical properties have a very strong influence on structure and hence we might expect that the phrases headed by functional and thematic heads will differ to some extent.
As far as the DP is concerned, an important observation that we have made in this chapter is that the possibilities for its complementation are very limited. Determiners take NP complements or no complements. This is typical of functional heads and contrasts strongly with thematic heads. In the next chapter this difference will be made clear.