code: def getExperiment(self):
          
          experiment = protocol.Experiment()
          experiment.id = self.getExperimentId()
          experiment.instrument_model = pb.string(self.getInstrumentModel())
          experiment.sequencing_center = pb.string(self.getSequencingCenter())
          experiment.description = pb.string(self.getExperimentDescription())
          experiment.library = pb.string(self.getLibrary())
          experiment.platform_unit = pb.string(self.getPlatformUnit())
          experiment.message_create_time = self._iso8601
          experiment.message_update_time = self._iso8601
          experiment.run_time = pb.string(self.getRunTime())
          return experiment
docs: Returns the GA4GH protocol representation of this read group's
          Experiment.