到目前为止，只有这个样式表声明，Mozilla还不能对查看文档结构有任何帮助。

So far, with that style sheet declaration alone, Mozilla does not do anything to help see the structure of the document.

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本文使用指令、声明或扩展元素等术语对样式表元素和属性作更精确地分类。

This article USES terms such as instructions, declarations, and extension elements to classify the elements and attributes of a stylesheet more precisely.

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样式表需要保证名称空间声明使用特定的前缀。

Your stylesheet tries to ensure that a namespace declaration uses a specific prefix

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