@utilities.arguments_not_none<EOL><INDENT>def remove_root_bank(self, bank_id):<DEDENT>
<EOL>if self._catalog_session is not None:<EOL><INDENT>return self._catalog_session.remove_root_catalog(catalog_id=bank_id)<EOL><DEDENT>return self._hierarchy_session.remove_root(id_=bank_id)<EOL>
Removes a root bank from this hierarchy.

        arg:    bank_id (osid.id.Id): the ``Id`` of a bank
        raise:  NotFound - ``bank_id`` not a parent of ``child_id``
        raise:  NullArgument - ``bank_id`` or ``child_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*