case MEASURE_NOMINAL: return "measure-date-nominal";
case MEASURE_ORDINAL: return "measure-date-ordinal";
case MEASURE_SCALE: return "measure-date-scale";
case MEASURE_NOMINAL: return "measure-date-nominal";
case MEASURE_ORDINAL: return "measure-date-ordinal";
case MEASURE_SCALE: return "measure-date-scale";