确定要使用哪种根元素类型很重要，因为它说明了(至少大致说明)文档的用途。

Deciding what type of root element to use is important because it states the document's purpose, at least in broad terms.

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它也不指定任何特定消息类型或XML文档的根元素。

It does not designate any specific message types or root elements of XML documents.

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首先，注意lure类型是根元素的一个属性。

First, note that the lure type is an attribute of the root element.

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