The value of the type attribute on xs:alternative corresponds to the type definition property of the type alternative schema component.

alternative 的 type 属性的值对应于类型替换模式组件的类型定义属性。

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At last the perturbation bounds of each attribute value and attribute weight, which make the alternative maintain the same sort, are obtained.

给出了当各方案的属性值和属性权重都发生变化时，为使原方案的排序结果不变，属性权重和属性值的一个扰动上界。

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