该模型可以同错误一起导出，但是最后这些都应该确定下来，将来在导出的时候就不用再做重复的工作。

The model can be exported with errors, but these should be fixed eventually so that rework is not required on future exports.

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将它同原始模型M1组装到一起。

This is put together with the original model M1.

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使用ValidationRule使验证处理同数据模型和ViewController分隔开。

Using ValidationRule keeps validation processing separate from the data model and ViewControllers.

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