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>
................................<跨接與外伸結構元素>
....................................<拱券與拱券構造>
........................................拱
............................................<依形式區分之拱券>
................................................尖拱
....................................................矛狀尖拱
|||........................................................矛尖桃拱
|||........................................................等邊矛狀尖拱
|||....................................................桃尖拱