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In XML Schema 1.1, the 25-case rule is removed, and replaced with a simple concept to reflect the "what is allowed by the restriction is also allowed by the base" goal.
XML Schema 1.1取消了25 - case规则，并替换为一个简单的概念，这个概念反映了“限制类型允许的元素也是基础类型所允许的元素”这一目标。
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