An indented document was usually, if not always, written in two or more identical versions. Orig. these were written on a single sheet of parchment and then cut apart along a zigzag, or 'indented' line. Each party to the agreement retained one copy, which he could readily authenticate by matching its serrate edge with that of another copy. [ Middle English Compendium]
通常情况下,制作的 indented(锯齿状)文件都是两份或多份完全相同的版本。最初,这些文件是在一张羊皮纸上书写的,然后沿着锯齿状或“锯齿线”切割开来。协议的每一方都保留一份副本,他们可以通过匹配锯齿边缘来轻松验证其真实性。[Middle English Compendium]