为了使代码更容易扩展，要使用清单14所示的分派表。
To make the code more easily extensible, use a dispatch table, as shown in Listing 14.
尤其是，通过使用分派表，可以按照非常清晰且可维护的方式处理许多不同结构的元素类型。
In particular, use of dispatch tables makes it possible to deal with many differently structured element types in a very clear and maintainable way.
对于服务程序来说，main的代码令人惊讶地简短，因为它只创建分派表并启动控制分派机。
In case of services, the code for main will be surprisingly short, since it just creates the dispatch table and starts the control dispatcher.
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