@abc.abstractmethod<EOL><INDENT>def add_root_vault(self, vault_id):<DEDENT>
pass<EOL>
Adds a root vault.

        :param vault_id: the ``Id`` of a vault
        :type vault_id: ``osid.id.Id``
        :raise: ``AlreadyExists`` -- ``vault_id`` is already in hierarchy
        :raise: ``NotFound`` -- ``vault_id`` not found
        :raise: ``NullArgument`` -- ``vault_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*