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. [windows and window components]
11. windows
12. [windows by form]

Anotations

Scope note:

Windows having primary divisions into three parts, usually reserved for windows divided vertically. Group of three small windows next to each other, separated from one another by small columns or posts. Also 'triplet windows'.