code: def remove_root_bank(self, bank_id):
          
          # Implemented from template for
          # osid.resource.BinHierarchyDesignSession.remove_root_bin_template
          if self._catalog_session is not None:
              return self._catalog_session.remove_root_catalog(catalog_id=bank_id)
          return self._hierarchy_session.remove_root(id_=bank_id)
docs: 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.*