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. [structural elements and components for structural elements]
8. structural elements
9. enclosing structural elements
10. [roofs and roof components]
11. roof components
12. exterior roof components
13. roof appendages

Anotations

Scope note:

Windowed superstructures crowning a roof or dome, and serving to give light or air to the space below; the term is also used to refer to such structures, whether or not they provide light. For small structures built on the ridges of roofs, common in American architecture, use "cupolas."