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 that extend to the ground or nearly to the ground. For floor-length wall openings consisting entirely or mostly of glass panels and hinged on one side so they may function as either doors or windows, use "French doors" if they are single doors or "French windows" if they are a pair of units.