A standard holder address space job log consists of the following DD names (example from JES2/SDSF):
NP DDNAME StepName ProcStep CrDate-CrTime O-Grp-N DSID Owner SYSTSPRT TAURHLDP mm/dd/jjjj hh:mm:ss 102 TAUUSR MAINTASK TAURHLDP mm/dd/jjjj hh:mm:ss 105 TAUUSR JESYSMSG mm/dd/jjjj hh:mm:ss 4 TAUUSR JESMSGLG mm/dd/jjjj hh:mm:ss 2 TAUUSR JESJCL JES2 mm/dd/jjjj hh:mm:ss 3 TAUUSR
The JESYSMSG, JESMSGLG and JESJCL DD names are the standard names used by JES2.