$XABKEY

   The $XABKEY macro allocates and initializes a XABKEY. No value is
   returned for this assembly-time operation.

   Format

     $XABKEY  COLTBL=collating-table-address,

              DAN=data-bucket-area-number,

              DFL=data-bucket-fill-size,

              DTP={BN2|DBN2|BN4|DBN4|BN8|DBN8|IN2

              |DIN2|IN4|DIN4|IN8|DIN8|COL|DCOL |PAC|DPAC|STG|DSTG},

              FLG=<CHG DAT_NCMPR DUP IDX_NCMPR KEY_NCMPR NUL>,

              IAN=index-bucket-area-number,

              IFL=index-bucket-file-size,

              KNM=key-name-buffer-address,

              LAN=lowest-level-index-area-number,

              NUL=null-key-value,

              NXT=next-xab-address,

              POS=<position,...>,

              PROLOG=prolog-level,

              REF=key-of-reference-value,

              SIZ=<size,...>