Whitespace outside of the document element and within start and end tags is normalized.

规范化文档元素之外和起始、结束标签之间的空白。

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Make all namespace declarations up in the start tag of the document element if at all possible.

如果可能，将所有名称空间的声明都编排到文档元素的开始标记中。

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XML documents have a tree structure, descending from the document element or outermost element.

XML 文档有一个树结构，从 document 元素或最外层元素向下排列。

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