<configuration>
   <system.web>

      <siteMap>
        <providers>
          <clear />
          <add siteMapFile="web.sitemap" name="AspNetXmlSiteMapProvider"
              type="System.Web.XmlSiteMapProvider, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
              securityTrimmingEnabled="true" />
        </providers>
      </siteMap>

   </system.web>
</configuration>
