命令api很简单：您使用方法来创建它们，再设定任意的输入参数，接着执行它们，然后获取结果，最后销毁它们。
The command API is simple: you use methods to create them, set any input parameters, execute them, get the results, and destroy them.
在设定查看器的内容时，您可以通过为该查看器提供表示输入的模型对象来完成。
When you set the viewer's contents, you do so by providing the model object that represents the input for that viewer.
现在根据上面设定的规则检验主题输入数据。
Subject input data will now be validated according to the rules set above.
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