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
............................................<依結構區分之拱頂>
................................................肋拱頂
|||....................................................扇形拱頂
|||....................................................枝肋拱頂
|||....................................................網狀拱頂
|||....................................................星狀枝肋拱頂
|||................................................疊澀拱頂