def exportAttributes(self, outfile, level, already_processed, namespace_='maec:', name_='CertificateType'):
        if self.validity is not None and 'validity' not in already_processed:
            already_processed.append('validity')
            outfile.write(' validity="%s"' % self.gds_format_boolean(self.gds_str_lower(str(self.validity)), input_name='validity'))