这种情况并不常见，通常在单独的文件中用DTD或XMLSchema定义类型信息，这样就不必在每次请求的每个标签中重复这些信息。
That is unusual; normally you define type information with a DTD or an XML Schema in a separate file, obviating the need to repeat this information for every tag on every request.
可能唯一的时间是当复原按钮被请求的时候，是当一个表单被同一个用户重复使用的时候，并且每次输入的信息是不同的。
Possibly the only time when a Reset button is called for, is when a form is used repeatedly by the same user and the information entered differs from each use.
可能唯一的时间是当复原按钮被请求的时候，是当一个表单被同一个用户重复使用的时候，并且每次输入的信息是不同的。
Possibly the only time when a Reset button is called for, is when a form is used repeatedly by the same user and the information entered differs from each use.
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