! *** PREDECLARED TYPES
     
      %IF %DECLARED ( %BASIC$QUADWORD_DECLARED ) = 0 %THEN
         RECORD BASIC$QUADWORD
            LONG FILL ( 2 )
         END RECORD
         %LET %BASIC$QUADWORD_DECLARED = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$OCTAWORD_DECLARED ) = 0 %THEN
         RECORD BASIC$OCTAWORD
            LONG FILL ( 4 )
         END RECORD
         %LET %BASIC$OCTAWORD_DECLARED = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$HFLOAT_AXP_DECLARED ) = 0 %THEN
         RECORD BASIC$HFLOAT_AXP
            LONG FILL ( 4 )
         END RECORD
         %LET %BASIC$HFLOAT_AXP_DECLARED = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$F_FLOATING_COMPLEX_DECL ) = 0 %THEN
         RECORD BASIC$F_FLOATING_COMPLEX
            SINGLE REAL_PART
            SINGLE IMAGINARY_PART
         END RECORD
         %LET %BASIC$F_FLOATING_COMPLEX_DECL = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$D_FLOATING_COMPLEX_DECL ) = 0 %THEN
         RECORD BASIC$D_FLOATING_COMPLEX
            DOUBLE REAL_PART
            DOUBLE IMAGINARY_PART
         END RECORD
         %LET %BASIC$D_FLOATING_COMPLEX_DECL = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$G_FLOATING_COMPLEX_DECL ) = 0 %THEN
         RECORD BASIC$G_FLOATING_COMPLEX
            GFLOAT REAL_PART
            GFLOAT IMAGINARY_PART
         END RECORD
         %LET %BASIC$G_FLOATING_COMPLEX_DECL = 1
      %END %IF
     
      %IF %DECLARED ( %BASIC$H_FLOAT_AXP_CMPLX_DCL ) = 0 %THEN
         RECORD BASIC$H_FLOATING_COMPLEX_AXP
            BASIC$HFLOAT_AXP REAL_PART
            BASIC$HFLOAT_AXP IMAGINARY_PART
         END RECORD
         %LET %BASIC$H_FLOAT_AXP_CMPLX_DCL = 1
      %END %IF
    
    
    ! 
    !  Module header
    ! 
      DECLARE LONG CONSTANT MHD$C_MHDID = 173  !  Value that must be in the ident 
      DECLARE LONG CONSTANT MHD$K_REFLNG = 8  !  Length of record to end of ref count 
      DECLARE LONG CONSTANT MHD$C_REFLNG = 8  !  Length of record to end of ref count 
      DECLARE LONG CONSTANT MHD$K_INSTIME = 8  !  Label for start of insert time 
      DECLARE LONG CONSTANT MHD$C_INSTIME = 8  !  Label for start of insert time 
      DECLARE LONG CONSTANT MHD$K_USRDAT = 16  !  Start of user additional header data 
      DECLARE LONG CONSTANT MHD$C_USRDAT = 16  !  Start of user additional header data 
      DECLARE LONG CONSTANT MHD$K_MHDLEN = 16  !  Length of fixed part of MHD 
      DECLARE LONG CONSTANT MHD$C_MHDLEN = 16  !  Length of fixed part of MHD 
      DECLARE LONG CONSTANT MHD$M_SELSRC = x'00000001'
      DECLARE LONG CONSTANT MHD$M_OBJTIR = x'00000002'
      DECLARE LONG CONSTANT MHD$M_WKSYM = x'00000004'
      DECLARE LONG CONSTANT MHD$K_OBJIDENT = 18  !  
      DECLARE LONG CONSTANT MHD$C_OBJIDENT = 18  !  
      DECLARE LONG CONSTANT MHD$K_OREFOFFSET = 52  !  Offset of the other ref. count
      DECLARE LONG CONSTANT MHD$C_OREFOFFSET = 52  !  Offset of the other ref. count
      DECLARE LONG CONSTANT MHD$S_MHDDEF = 64
      record MHDDEF
         BYTE MHD$B_LBRFLAG                 !  Librarian-controlled flag byte 
         BYTE MHD$B_ID                      !  Ident 
         WORD MHDDEF$$_FILL_1               !  Reserved word 
         LONG MHD$L_REFCNT                  !  Reference count 
         LONG MHD$L_DATIM                   !  Date/time inserted 
         group MHD$R_FILL_2_OVERLAY
            variant
               case
                  LONG MHDDEF$$_FILL_2      !  ... 
               case
                  group MHD$R_FILL_2_FIELDS
                     BYTE MHDDEF$$_FILL_3 ( 1 to 4 )
                     STRING MHD$B_USRDAT = 0  !  Start of user additional header data 
                  end group MHD$R_FILL_2_FIELDS
            end variant
         end group MHD$R_FILL_2_OVERLAY
         group MHD$R_OBJSTAT_OVERLAY
            variant
               case
                  BYTE MHD$B_OBJSTAT        !  Status of object module 
               case
                  group MHD$R_OBJSTAT_BITS
                      !  Selective search 
                      !  Module contains TIR records 
                      !  Module contains other non-group global symbol
                     BYTE SELSRC_bits   ! COMMENT ADDED BY SDL - SELSRC_bits contains bits SELSRC through FILL_1_
                  end group MHD$R_OBJSTAT_BITS
            end variant
         end group MHD$R_OBJSTAT_OVERLAY
         group MHD$R_OBJIDLNG_OVERLAY
            variant
               case
                  BYTE MHD$B_OBJIDLNG       !  Length of ident 
               case
                  group MHD$R_OBJIDLNG_FIELDS
                     BYTE MHDDEF$$_FILL_4
                     STRING MHD$T_OBJIDENT = 0  !  Object module ident 
                  end group MHD$R_OBJIDLNG_FIELDS
            end variant
         end group MHD$R_OBJIDLNG_OVERLAY
         BYTE MHDDEF$$_FILL_5 ( 1 to 31 )      !  Object module ident data or GSMATCH area
         BYTE MHDDEF$$_FILL_6 ( 1 to 3 )       !  space
         LONG MHD$L_OTHEREFCNT              !  Other reference count
         LONG MHD$L_MODSIZE                 !  Module size
         LONG MHD$L_FILL_7                  !   part of module size.
      end record MHDDEF