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)
............................................<依結構區分之屋頂>
................................................<依結構區分之屋頂：桁架與橫樑結構>
|||....................................................對椽屋頂
|||....................................................托臂梁屋頂
|||....................................................中柱式屋頂
|||....................................................偶柱式屋頂
|||....................................................桁架式椽條屋頂
................................................懸索屋頂
|||....................................................天幕