key attributeki:əˈtribju:t短语²⁸³²⁷ 基本例句 信息标号属性 A special case of a composite role is where a business object can only be uniquely identified when combining its key/span> attribute with its parent’s key attribute. 组合角色一个特殊情况是，业务对象只能通过将其键属性与父级的键属性进行组合来唯一标识。 ibm