@abc.abstractmethod<EOL><INDENT>def set_display_name(self, display_name):<DEDENT>
pass<EOL>
Sets a display name.

        :param display_name: the new display name
        :type display_name: ``string``
        :raise: ``InvalidArgument`` -- ``display_name`` is invalid
        :raise: ``NoAccess`` -- ``display_name`` cannot be modified
        :raise: ``NullArgument`` -- ``display_name`` is ``null``

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