f = ecflow.Family("f")
 f.add_repeat( ecflow.RepeatDate("YMD",20100111,20100115,2) )
 f1 = ecflow.Family("f1")
 f1.add_repeat( ecflow.RepeatInteger("count",0,100,2) )
 f2 = ecflow.Family("f2")
 color_list = ["red", "green", "blue" ] 
 f2.add_repeat(ecflow.RepeatEnumerated("enum",color_list) )
 task6 = ecflow.Task("t6").add_repeat( RepeatString("R", ["a","b","c"]))