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. [doorways and doorway components]
11. doorway components

Anotations

Scope note:

Strips fastened to the floor beneath a door, usually required to cover the joint when two types of floor material meet; may provide weather protection on external doors; for the lower sides and bottom of doorways, use "doorsills."