Hierarchy classification:

1. top of the aat hierarchies
2. Physical Attributes Facet
3. Conditions and Effects (hierarchy name)
4. [conditions and effects by specific type]

Anotations

Scope note:

The condition of providing access and being unblocked. Typically relating to an object or environment that has both an open and closed state, such as a book, box, vessel, garment, gate, window, room, or the like.