@abc.abstractmethod<EOL><INDENT>def get_hierarchy_form_for_update(self, hierarchy_id):<DEDENT>
return<EOL>
Gets the hierarchy form for updating an existing hierarchy.

        A new hierarchy form should be requested for each update
        transaction.

        :param hierarchy_id: the ``Id`` of the ``Hierarchy``
        :type hierarchy_id: ``osid.id.Id``
        :return: the hierarchy form
        :rtype: ``osid.hierarchy.HierarchyForm``
        :raise: ``NotFound`` -- ``hierarchy_id`` is not found
        :raise: ``NullArgument`` -- ``hierarchy_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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