    from RoleUserManagerMixIn import RoleUserManagerMixIn
    from UserManagerToFile import UserManagerToFile

    class RoleUserManagerToFile(UserManagerToFile, RoleUserManagerMixIn):
        """
        See the base classes for more information.
        """

        def __init__(self, userClass=None):
            UserManagerToFile.__init__(self, userClass)
            RoleUserManagerMixIn.__init__(self)