@abc.abstractmethod<EOL><INDENT>def set_fixed_start_offset(self, offset):<DEDENT>
pass<EOL>
Sets the fixed start offset.

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

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