@abc.abstractmethod<EOL><INDENT>def set_fixed_duration(self, duration):<DEDENT>
pass<EOL>
Sets the fixed duration.

        :param duration: the fixed duration
        :type duration: ``osid.calendaring.Duration``
        :raise: ``InvalidArgument`` -- ``duration`` is invalid
        :raise: ``NoAccess`` -- ``duration`` cannot be modified
        :raise: ``NullArgument`` -- ``duration`` is ``null``

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