@abc.abstractmethod<EOL><INDENT>def set_format_type(self, format_type):<DEDENT>
pass<EOL>
Sets the ``DisplayText`` format type.

        :param format_type: the format type
        :type format_type: ``osid.type.Type``
        :raise: ``NullArgument`` -- ``format_type`` is ``null``

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