模式中的定义和声明可能引用属于其他名称空间的名字。
Definitions and declarations in a schema can refer to names that may belong to other namespaces.
为了引用和简化名称空间的名字，同样要使用xmlns声明。
To refer to and abbreviate the name of a namespace, again use XMLNS declarations.
为了引用和简化名称空间的名字，同样要使用xmlns声明。
To refer to and abbreviate the name of a namespace, again use XMLNS declarations.
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