The following example provides a description of the parameter list:
++PRLPLID DS CL4 EBCDIC 'PREL' FOR PARTREL
+PRLNGTH DS AL2 LENGTH OF PARAMETER LIST
+PRERRCDE DS H ERROR CODE RETURNED FROM
+* PARTIAL RELEASE
+PRLFLAG DS XL1 PARAMETER FLAG BYTE
+PRLPGM EQU X'00' MODE=PGM (PROBLEM PROGRAM)
+PRLSUP EQU X'80' MODE=SUP (SUPERVISOR STATE)
+PRLTIOT EQU X'40' TIOT=NOENQ
+PRLNERAS EQU X'20' ERASE=NO
+PRLERASE EQU X'10' ERASE=YES
+PRLVCLOS EQU X'08' VSAMCLLR=VSAMCLSE
+PRLVCNV EQU X'04' VSAMCLLR=NOTVSAM
+PRLBYPS EQU X'02' VSAMSEC=BYPASS
+PRLNBYPS EQU X'01' VSAMSEC=NOBYPASS
+PRLFLAG2 DS XL1
+PRLVKSDS EQU X'80' VSAMTYPE=KSDS
+PRLVESDS EQU X'40' VSAMTYPE=ESDS
+PRLVRRDS EQU X'20' VSAMTYPE=RRDS
+PRLVVRRD EQU X'10' VSAMTYPE=VRRDS
+PRLVLDS EQU X'08' VSAMTYPE=LDS
+PRLEXTD EQU X'04' VSAMFMT=EXTD
+PRLSTD EQU X'02' VSAMFMT=STD
+PRLTIOTX EQU X'01' No ENQ TEST when TIOT=NOENQ is specified
+PRLRSVD DS XL2 RESERVED
+PRLDSN DS A DATA SET NAME POINTER
+PRLUCB DS A UCB POINTER
+PRLTRKS DS A ADDRESS OF NUMBER OF TRACKS RETURNED
(ONLY VALID FOR VSAM REQUESTS)
+PRLCTGR DS F CATALOG REASON CODE
+PRLEND EQU * END OF PARAMETER LIST
+PRLENGTH EQU PRLEND-PRELPL LENGTH OF PARAMETER LIST