
  TYPE
    amt$volume_position = (amc$after_data_block, amc$after_tapemark,
          amc$before_tapemark, amc$bov, amc$eov, amc$mid_bov_label_group,
          amc$mid_eof_label_group, amc$mid_eov_label_group,
          amc$mid_hdr_label_group, amc$position_uncertain);

