获取根结点的区别？

Set objRootlist = objXML.documentElement.selectSingleNode("NewList")
和
set rootNewNode=objXML2.documentElement
这两种有什么不同啊？
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set rootNewNode=objXML2.documentElement
gives you the top level element,

Set objRootlist = objXML.documentElement.selectSingleNode("NewList")
gives you the first child element "NewList" under top level element

Set objRootlist = objXML.selectSingleNode("NewList")
gives you the top level element NewList if it exists