这是个web.sitemap文件，看不太懂？？

[akt87]

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
	<siteMapNode>
		<siteMapNode url="~/Default.aspx" title="Home" description="Home Page"/>
		<siteMapNode url="~/Items.aspx" title="Items" description="Items">
			<siteMapNode url="~/ItemDetail.aspx" title="Item" description="Item"/>
		</siteMapNode>
		<siteMapNode url="~/People.aspx" title="People" description="About Our People"/>
		<siteMapNode url="~/News.aspx" title="News" description="News About The Business"/>
		<siteMapNode url="~/About.aspx" title="About" description="Business Overview"/>
		<siteMapNode url="~/Contact.aspx" title="Contact" description="Contact Information"/>
		<siteMapNode url="~/Testimonials.aspx" title="Testimonials" description="Customer's Opinions"/>
	</siteMapNode>
</siteMap>

中间的<siteMapNode url="~/ItemDetail.aspx" title="Item" description="Item"/>
</siteMapNode>
什么意思？怪怪的？导航条里面没有Item，只有Items啊，怎么会有这么一条？
这些siteMapNode都是怎么对牢的啊？