In other words, you know that the ISBN of a Pamphlet always has a limit of five digits.
换句话说,您知道Pamphlet的IS BN一直有五位数字的限制。
You derive this component from the type ISBN and restrict an ISBN to a maximum of five digits.
您从类型IS BN派生该组件并限制其IS BN最大为五位。
You want to enforce this rule in your schema so that there is a validation error if you get more than five digits.
您希望在您的模式中实施这一规则,以便在获得五位数以上时有一个验证错误。
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