@abc.abstractmethod<EOL><INDENT>def get_function_form_for_update(self, function_id):<DEDENT>
return<EOL>
Gets the function form for updating an existing function.

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

        :param function_id: the ``Id`` of the ``Function``
        :type function_id: ``osid.id.Id``
        :return: the function form
        :rtype: ``osid.authorization.FunctionForm``
        :raise: ``NotFound`` -- ``function_id`` is not found
        :raise: ``NullArgument`` -- ``function_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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