第二点出现是因为链接框架可以从属性中查询Bean验证的元数据api，并接受约束的列表。
The second point happens because from a property, the linking framework can query the Bean Validation's metadata API and receive the list of constraints.
若要查看某个约束的属性，请在列表中单击该约束。
To view the properties of a constraint, click it in the list.
若要查看某个约束的属性，请在列表中单击该约束。
To view the properties of a constraint, click it in the list.
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