Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. architectural elements
7. [openings and opening components]
8. openings (architectural elements)
9. [openings by form]
10. [gateways and gateway components]
11. gateway components
12. [gates and gate components]
13. gates (swinging barriers)

Anotations

Scope note:

Barriers used to close sluices, which are artificial passages for water fitted with a valve or gate for stopping or regulating the flow. Often taking the form of a "wicket (architectural element)," which is a gate or door set into a larger gate or door.