XP X X0X0 YP ZP LP L L0L0 YP ZP FP F F0F0 YP ZP X -syntax X 0 : N, V, A, P, C, I, DL 0 : N, V, A, PF 0 : C, I, D Basic schema:Lexical projections: Functional projections: Economy of Expression: All syntactic phrase structure nodes are optional and are not used unless required by independent principles (completeness, coherence, semantic expressivity).
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