藝術與建築詞典根目錄
....物件層面
........組件 (層級名)
............成分
................<依特定背景區分之組件>
....................建築元素
........................<結構元素與結構元素構造>
............................<結構元素>
................................<封閉式結構元素>
....................................<屋頂與屋頂構造>
........................................屋頂 (屋頂構造)
............................................<依形式區分之屋頂>
................................................<依形式區分之屋頂：內部形狀>
|||....................................................筒形屋頂
|||....................................................半圓形屋頂
|||....................................................開敞式屋頂
................................................<依形式區分之屋頂：外部形狀>
|||....................................................蝶形屋頂
|||....................................................平屋頂
....................................................斜屋頂
|||....................................................弓形屋頂
|||....................................................鋸齒形屋頂