Combining positional and keyword operands

You can use positional and keyword operands in the same macro instruction. Use a positional operand for a value that you change often, and a keyword operand for a value that you change infrequently.

Positional and keyword parameters can be mixed freely in the macro prototype statement (see 1 in Figure 1). The same applies to the positional and keyword operands of the macro instruction (see 2 in Figure 1). Note, however, that the order in which the positional parameters appear (see 3 in Figure 1) determines the order in which the positional operands must appear. Interspersed keyword parameters and operands (see 4 in Figure 1) do not affect this order.

Figure 1. Combining positional and keyword parameters

                                    4 
                          ┌─────────┴─────────┐
              MACRO       V                   V
       1      MIX   &P1,&KEY1=A,&P2,&P3,&P4,&KEY2=,&P5
              .     ¹           ²   ³   ⁴          ⁵      3 
              .
              .
              MEND
─────────────────────────────────────────────────────────────────
              START 0
              .
              .
              .            ₁   ₂   ₃             ₄    ₅      3 
       2      MIX   KEY1=B,ONE,TWO,THREE,KEY2=33,FOUR,FIVE
              .      ∧                    ∧
              .      └─────────┬──────────┘
              .                4 
              END

&SYSLIST(n): The system variable symbol &SYSLIST(n) refers only to the positional operands in a macro instruction.