# Complement domain

From Glottopedia

In generative syntax, a **complement domain** is a notion in checking theory. The complement domain is the subset of a domain reflexively dominated by a complement.

### Example

In the example, YP is the complement domain of X (and H).

XP_{1}/\ / \ UP XP_{2}/\ / \ ZP_{1}X' /\ /\ / \ / \ WP ZP_{2}X_{1}YP /\ / \ H X_{2}