What can optionally appear before the first executable control section

The instructions or groups of instructions that can optionally be specified before the first executable control section are:

The following assembler instructions:

ACONTROL ADATA    AINSERT  ALIAS    CEJECT   COPY
DXD      EJECT    ENTRY    EXITCTL  EXTRN    ISEQ
MACRO    MEND     MEXIT    POP      PRINT    PUNCH
PUSH     REPRO    SPACE    TITLE    WXTRN    XATTR

Comment statements, including macro format comment statements
Any statement which is part of an inline macro definition, between MACRO and MEND statements, with the possible exception of *PROCESS and ICTL.
Common control sections
Dummy control sections
Any conditional assembly instruction
Macro instructions that do not generate statements that establish the first section

These instructions or groups of instructions belong to a source module, but are not considered part of an executable section.