How to maintain a web.sitemap file

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I have this sample sitemap xml below i want to write an aspx page to modify
below..
Any ideas?



<?xml version="1.0" encoding="utf-8" ?>

<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0"; >

<siteMapNode url="default.aspx" title="Home">

<siteMapNode url="approver.aspx" title="Approver Expenses"
roles="S_Information,S_Calle" />

<siteMapNode url="audit/auditor.aspx" title="Audit Page"
roles="S_Information" />

<siteMapNode url="admin/admin.aspx" title="Admin Manager"
roles="S_HeadOffice" />

</siteMapNode>

</siteMap>


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