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. circulation elements
8. ramps (circulation elements)

Anotations

Scope note:

Inclined planes that are constructed instead of or in addition to stairways in order to allow wheelchair users and people pushing carts or other small wheeled devices to access buildings, parts of buildings, curbs, or other locations where it is necessary to go from one level to another.