Sitemap & roles

I want to allow only one role access to one of my items in my sitemap.





description="Items">
description="Item"/>

description="Downloads" roles="*"/>



description="Contact Information"/>
description="Information for..."/>




In this case I want all roles to see all items except for the Admin item -
this should only be available to the admin role.

However, this gives me no items on the sitemap at all. If I change the third
line to:



then all roles can see all items including the Admin one. How would I go
about locking out non-admin users from the Admin item using my sitemap
whilst allowing all roles to see every other item?

TIA