The primary audience of use-case package diagrams is project stakeholders; therefore, the organization of these diagrams should reflect their needs.
用例包图的读者主要是项目的各种涉众,因此图形的组织必须满足他们的需求。
For example, if it's a use-case package diagram, then there is likely an include, extend, or inheritance relationship between a use case in one package and one in the other package.