A profile contains a hierarchy of profile categories, which split up the data that you can store into contextual areas, similar to a folder structure on disk.
In fact, these data categories are the real thing, and the hierarchy inside each profile is a virtual copy of the same structure.
实际上，这些数据类别是真实的，而配置文件中的结构则是这个结构的虚拟副本。
3
In a hierarchical datastructure, each root record may have many associated records at the next level down in the hierarchy, and there may be many additional subordinate levels.