READ : Allow user to view this Thread
CREATE : Allow user to create new resource below this Thread
UPDATE : Allow user to edit this Thread
DELETE : Allow user to delete this Thread
POST MESSAGE : Allow user to post new messages in this Thread

Resource has permissions :	READ	CREATE	UPDATE	DELETE	POST MESSAGE	Action
ls://dev.artenum.com/groups/manager						Edit -  Delete -  (recursive)
ls://dev.artenum.com/groups/reader						Edit -  Delete -  (recursive)
ls://dev.artenum.com/users/guest						Edit -  Delete -  (recursive)

    (owner has all permissions)