官方文档

Every Asset and Actor that the Unreal Editor has loaded in memory has a path that uniquely identifies it.

In general, these object paths follow the format:

 /path/PackageName.ObjectName:SubObjectName.SubObject

Programmers who work with the Engine in C++ may recognize this format as the same one accepted by functions like FindObject() and StaticFindObject().
For example, to deconstruct an Actor path shown in the request examples above:

如上表所示，Path部分很好理解，在Content Browser里可以直接看到。而PackageName通常就是资产文件名，资产里包含若干Object，它们各有ObjectName，即资产文件其实是个Package。