val pp_position: MetadataTypes.position -> string
val pp_position_tag: MetadataTypes.position -> string
-(* val pp_constr: MetadataTypes.constr -> string *)
+val pp_constr: MetadataTypes.constr -> string
(** Pretty printer and OCamlDBI friendly interface *)
val pp_columns: ?sep:string -> t list list * t list list * t list list -> string
*)
+val pp_relation: MetadataTypes.relation -> string
+