id	description	section	req	max_loop	max_usage	pos
BGN	Beginning Segment	H	M	0	1	1
R9	Route Code Identification	H	M	50	1	2
PER	Administrative Communications Contact	H	O	0	1	3
DTM	Date/Time Reference	H	M	0	10	4
RDD	Route Description Detail	H	O	0	5	5