noun
document layout root
In computing, the root element or base structure that defines the layout of a document, such as in XML or typesetting systems.
XML文書では、文書割付け根が全体のレイアウトを定義する。
In an XML document, the document layout root defines the overall layout.
Compound of 文書 (document), 割付け (layout, assignment), and 根 (root). A technical term likely coined in computing contexts.