Typically, the hierarchicalfile structure is more space-efficient but more difficult to use.
层级式档案架构具备较节省空间的特性，但较难使用。
2
A Hierarchicalfile can be stored in a rectangular file structure by storing all units of analysis in a single physical record.
而一个层级式档案可以用长方形档案结构储存，亦即所有的分析单位都存到单一笔的实体记录中。
3
A hierarchicalfile is one that contains information collected on multiple units of analysis where each unit of analysis is subordinate to another unit.