W3C XML Schema文档中，attribute元素的属性use值为表示属性是可选的并且可以具有任何值。-在线学习平台

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W3C XML Schema文档中，attribute元素的属性use值为表示属性是可选的并且可以具有任何值。

Aoptional

Bprohibited

Crequired

Dfixed

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