程序将在上个专栏中编写的应用程序基础上进行扩展，但是在这里，它将在资源库中查询可用的软件资源库服务。
The program will be an extension of the application written in the last column, but here it will query the repository for available software repository services.
一个会话就是一个数据资源库，该库可在任意时刻被应用的任意部分轻松地访问。
A session is a repository of data that can, at any time, be easily accessed by any part of an application.
在第一期专栏中，我们构建了一个软件资源库，允许您使用HTTP从资源库查看和检索软件包。
In the first column, we built a software repository that displayed and retrieved software packages using HTTP from a repository.
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