Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by function]
8. ceremonial structures
9. religious structures
10. religious buildings
11. churches (buildings)
12. [churches by form]

Anotations

Scope note:

Churches having a centralized, circular plan; examples are the round churches popular in Scandinavia in the 11th and early 12th centuries. For churches with a round floorplan but that are in the form of a tower, use "round-tower churches." For churches having a centralized that is polygonal rather than circular, use "polygonal churches."