Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Open Spaces and Site Elements (hierarchy name )
5. open spaces
6. [open spaces by function]
7. walkways

Anotations

Scope note:

Denotes generally enclosed and climate-controlled pedestrian walkways or networks of them consisting of bridgelike structures over streets, second-story corridors within buildings, and various activity hubs connecting retail and service establishments, usually in a downtown area; for the individual bridgelike structures over streets, use "skybridges."