Sub Element Usage Card Type Description Note
+ FromDate optional 1..1 unknown   Is equal to the start date of the timetable year or, more generally, the period in which the ValidDayBits apply.
+ ToDate optional 1..1 unknown   Is equal to the end date of the timetable year or, more generally, the period in which the ValidDayBits apply.
+ ValidDayBits mandatory 1..1 unknown    
+ timebands optional 1..1 unknown   Can also be referenced
++ Timeband optional 1..1 unknown    
++ TimebandRef optional 1..1 unknown