Format: environment variable for QSAM files, DSN option

1 DSN(data-set-name
2? (member-name)
3 )
4? 
4 NEW
4 OLD
4 SHR
4 MOD
5? 
5 TRACKS
5 CYL
6? SPACE(nnn,mmmm)
7? VOL(volume-serial)
8? UNIT(type)
9? 
9 KEEP
9 DELETE
9 CATALOG
9 UNCATALOG
10? STORCLAS(storage-class)
11? MGMTCLAS(management-class)
12? DATACLAS(data-class)