创建一个新的类库项目，确认使用一个逻辑化的命名结构。
Create a new class project, be sure to use a logical naming structure.
主题提供了分层的命名结构，因此应用程序(订阅方)可以灵活地进行注册。
A topic provides a hierarchical naming structure so that applications (subscribers) can register varying degrees of interest.
下面是文件处理的另一个示例：用已知的命名结构浏览MP 3文件的目录并抽取专辑名。
Here's another example of file processing: look through a directory of MP3 files with a known naming structure and extract the album name.
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