消息类用于检索前一个操作(比如一个命令调用)生成的消息。

The message classes are used to retrieve messages generated by a previous operation such as a command call.

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回忆一下前面的内容，我们通过在Skeleton . tmpl文件上运行cheetah compile命令生成了Skeleton . py，这是一个包含称作Skeleton的python类的包，这个包的作用类似于Skeleton . tmpl。

Recall that running the cheetah compile command on the Skeleton.tmpl file generates Skeleton.py, a package containing a Python class called Skeleton that ACTS just like Skeleton.tmpl.

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为构建这些编辑器，框架提供了命令的代码生成功能和一些其他类，用于提供对模型的程序化访问。

To build these editors, the framework provides command code-generation capabilities and other classes to provide programmatic access to the models.

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