Message in Chinese (Simplified) (中文(简体))
不允许进行下列操作: 为现有类别添加新的强制属性；从现有类别删除强制属性；为没有向回链接属性的特殊类别 "Top" 添加可选属性，向回链接属性指的是直接或通过继承。例如: 添加或删除附属类别。
Unlocalized message
Adding a new mandatory attribute to an existing class, deleting a mandatory attribute from an existing class, or adding an optional attribute to the special class Top that is not a backlink attribute (directly or through inheritance, for example, by adding or deleting an auxiliary class) is not allowed.
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