Security trimming problem with not absolute path

[Alexj]

Hello, I have a problem that for many of you will surely be trivial, I wanted
to enable the security trimming by xml, everything works if I insert full
address in the sitemap.
But if I put the ~ as shown below does not work the disappearance of the
menu items to unauthorized persons:

xml version = "1.0" encoding = "utf-8"?
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0">
<siteMapNode url="#" title="Start" description="Inizio" roles="*">
<siteMapNode url="~/CreazioneDocumentale/antfattStep1.aspx?enc=99999"
title="Creazione Distinta" roles="Domain\0001" />
<siteMapNode url="~/CreazioneDocumentale/antfattStep1.aspx?enc=3333333"
title="Pred. Request "description="Pred. Request BO" roles="Domain\0002" />

</ siteMapNode>
</ siteMap>

Below a part of web.config:

<authentication mode="Windows"/>

<siteMap defaultProvider="xmlSite" enabled="true">
<providers>
<clear/>
<add name="xmlSite" type="System.Web.XmlSiteMapProvider"
siteMapFile="~/Sitemap/filename.sitemap" securityTrimmingEnabled="true"/>
</providers>
</siteMap>
<roleManager enabled="true"
defaultProvider="AspNetWindowsTokenRoleProvider">
<providers>
<clear/>
<add name="AspNetWindowsTokenRoleProvider"
type="System.Web.Security.WindowsTokenRoleProvider"/>
</providers>
</roleManager>

<authorization>
<deny users="?"/>
<allow roles="Domain\0001"/>
</authorization>


Thanks in advance for answers.