案例4：声明带前缀的名称空间。

Case 4: Declare prefixed namespaces.

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带前缀的运动动词不再有定向和不定向之分，但也可表示动作方向，这种方向是由前缀体现的。

Sport verb with prefix don't have the separation between the definite direction and indefinite direction, but can mean to act the direction, this kind of direction to be used by prefix now.

youdao

当您希望将旧 XML 文档使用的缺省名称空间转换成带前缀的名称空间时，这种更改特别有用。

This can be especially useful when the old XML documents use a default namespace that you want to convert to a prefixed namespace.

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