SYNTAX: Notion in checking theory. The internal domain of A is the minimal complement domain of A. EXAMPLE: In (i), the complement domain of X (and H) is YP and everything YP dominates. The internal domain of X (and H) is just YP.
(i) XP1 /\ / \ UP XP2 /\ / \ ZP1 X' /\ /\ / \ / \ WP ZP2 X1 YP /\ / \ H X2
|LIT.||Chomsky, N. (1993)|