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>
........................................<屋頂構造>
............................................<屋頂框架構造>
................................................椽
|||....................................................長椽
|||....................................................脊椽
....................................................短椽
|||........................................................屋谷短椽
|||....................................................主椽
|||....................................................屋谷椽條
|||................................................檐椽接長木