约束是定义在一个bean（领域对象）中的，因此校验逻辑离领域模型最近。
The constraints are defined in the bean (domain object) so the validation logic is close to the domain model.
ROO是如何自动产生样板（boiler plate）代码，同时又提供灵活性以增加自定义业务逻辑和校验规则的？
How does ROO address the real-world Java application requirement of auto-generate the boiler plate code and at the same time, provide the flexibility to add custom business logic and validation rules?
论证了用这些门电路所构成的二值逻辑系统对所有向中型故障是完全自校验的。而对无中型故障，该系统是易于测试的。
It is proven that the binary logic system realized with these gates is totally self-checking for mid-seeking faults.
奇偶校验：加于一组二进制数字内的一个校验数元。它跟据系统逻辑，使总数为奇数或偶数。
Parity bit: a check bit added to a series of binary digits to make the total odd or even according to the logic of the system.
奇偶校验：加于一组二进制数字内的一个校验数元。它跟据系统逻辑，使总数为奇数或偶数。
Parity bit: a check bit added to a series of binary digits to make the total odd or even according to the logic of the system.
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