Like all OsidLists, PeriodList provides a means for accessing Period elements sequentially either one at a time or many at a time. Examples:

                     
                     
                     while (pl.hasNext()) {
                          Period period = pl.getNextPeriod();
                     }
                     
                                 
                     
                

                     
                     
                     while (pl.hasNext()) {
                          Period[] periods = pl.getNextPeriods(pl.available());
                     }