let obj_tbl = MetadataTypes.obj_tbl () in
let sort_tbl = MetadataTypes.sort_tbl () in
let rel_tbl = MetadataTypes.rel_tbl () in
let obj_tbl = MetadataTypes.obj_tbl () in
let sort_tbl = MetadataTypes.sort_tbl () in
let rel_tbl = MetadataTypes.rel_tbl () in