Multiple unqualified names joined by periods. Each qualifier is coded like an unqualified name; therefore, the name must contain a period after every 8 characters or fewer. For example, DSNAME=ALPHA.PGM is a qualified data set name. The maximum length of a qualified data set name is:

• 44 characters, including periods.
• For a generation data group, 35 characters, including periods.
• For an output tape data set, 17 characters, including periods. If longer than 17 characters, only the rightmost 17 characters, excluding trailing blanks, are written to the tape header label. For more information, see z/OS DFSMS Using Magnetic Tapes .