! *** 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
    
    
    ! 
    !         allocation xab definitions
    !                 $xaballdef
    ! 
    !   the fields thru bkz cannot be rearranged due to
    !   their commonality with fab
    ! 
      DECLARE LONG CONSTANT XAB$C_ALL = 20  !  xaball id code
      DECLARE LONG CONSTANT XAB$M_HRD = x'00000001'
      DECLARE LONG CONSTANT XAB$M_ONC = x'00000002'
      DECLARE LONG CONSTANT XAB$M_CBT = x'00000020'
      DECLARE LONG CONSTANT XAB$M_CTG = x'00000080'
      DECLARE LONG CONSTANT XAB$C_ANY = 0   !  any allocation o.k.
      DECLARE LONG CONSTANT XAB$C_CYL = 1   !  cylinder boundary
      DECLARE LONG CONSTANT XAB$C_LBN = 2   !  allocate at specified lbn
      DECLARE LONG CONSTANT XAB$C_VBN = 3   !  allocate near specified vbn
      DECLARE LONG CONSTANT XAB$C_RFI = 4   !  allocate near related file
      DECLARE LONG CONSTANT XAB$S_XABALLDEF = 32
      record XABALLDEF
         BYTE XABALLDEF$$_FILL_1
         BYTE XABALLDEF$$_FILL_2
         WORD XABALLDEF$$_FILL_3
         LONG XABALLDEF$$_FILL_4            ! HAS SAME COD, BLN, SPARE AND NXT FIELD
    ! THESE 4 FIELDS ARE COMMON TO ALL XABS AND
    ! HAVE BEEN DEFINED BY $XABDEF
         group XAB$R_AOP_OVERLAY
            variant
               case
                  BYTE XAB$B_AOP            !  allocation options
               case
                  group XAB$R_AOP_BITS
                      !  fail if requested alignment impossible
                      !  locate allocated space within a cylinder
                      !  (spares)
                      !  contiguous alllocation, best try
                      !  spare
                      !  contiguous allocation
                     BYTE HRD_bits   ! COMMENT ADDED BY SDL - HRD_bits contains bits HRD through CTG
                  end group XAB$R_AOP_BITS
            end variant
         end group XAB$R_AOP_OVERLAY
         BYTE XAB$B_ALN                     !  alignment type
         WORD XAB$W_VOL                     !  relative volume no. for allocation
    !  (not applicable if aln = vbn or rfi)
         LONG XAB$L_LOC                     !  allocation location
         LONG XAB$L_ALQ                     !  allocation quantity
         WORD XAB$W_DEQ                     !  default allocation quantity
         BYTE XABALLDEF$$_FILL_7            !  bucket size for area (note: field name is bkz,
    !  defined above in $xabdef,since it is shared by the fhc
    !  xab and has the same offset, of course)
    ! -----*****
    ! HAVE BEEN DEFINED BY $XABDEF
         BYTE XAB$B_AID                     !  area id number
         group XAB$R_RFI_OVERLAY
            variant
               case
                  WORD XAB$W_RFI ( 1 to 3 )    !  related file id
               case
                  group XAB$R_RFI_FIELDS
                     WORD XAB$W_RFI0        !  file number
                     WORD XAB$W_RFI2        !  seq number
                     WORD XAB$W_RFI4        !  rev number
                  end group XAB$R_RFI_FIELDS
            end variant
         end group XAB$R_RFI_OVERLAY
         WORD XABALLDEF$$_FILL_8            !  (spare)
      end record XABALLDEF
    
    !  basealign on aggregate XABALLDEF operates after aggregate end
      DECLARE LONG CONSTANT XAB$K_ALLLEN = 32  !  length of xaball
      DECLARE LONG CONSTANT XAB$C_ALLLEN = 32  !  length of xaball