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>
....................................<拱頂與拱頂構造>
........................................拱頂
............................................簡式拱頂
................................................筒形拱頂
|||....................................................環形拱頂
|||....................................................半桶形拱頂
|||....................................................斜爬式拱頂
|||....................................................螺旋拱頂
................................................圓錐式拱頂
|||....................................................尖圓拱頂