不允许向现有类添加新的强制属性、从现有类中删除强制属性或向非反向链接属性的特殊类 Top 添加可选属性(直接或通过继承,例如通过添加或删除辅助类)。
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官方说明 · 原文
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.
修改记录:Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text. 译文说明已标注为自动翻译。