Schema definitions and XSLT stylesheets may intermix the elements and attributes of their language with elements and attributes from other namespaces, so prefixes are needed.

模式定义和 XSLT 样式表可能会将其语言的元素和属性同其它名称空间的元素和属性混淆，所以需要前缀。

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The default namespace declaration, if any, then all other namespace declarations, in alphabetical order of the prefixes they define.

如果有默认名称空间声明的话紧跟在后面，然后是其他名称空间声明，按照定义前缀的字母顺序。

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However, variables may also be explicitly declared as belonging to other scopes, using a variety of prefixes, as summarized in Table 1.

然而，也可以显式地将变量声明为属于其他范围，可以使用各种前缀进行声明，表1进行了总结。

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