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. [architectural elements by building type]
8. religious building fixtures
9. Christian religious building fixtures

Anotations

Scope note:

Spaces in a church marked by an arch, usually as the entrance to an apse or chapel, coinciding with the part of the building containing a font for the baptismal rite. The open space beneath the arch may be spanned by a gate, grillwork, or door.