(* Copyright (C) 2004, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://helm.cs.unibo.it/
 *)

(** metadata -> string *)

val pp_position: MetadataTypes.position -> string
val pp_position_tag: MetadataTypes.position -> string
val pp_constr: MetadataTypes.constr -> string 

(** Pretty printer and OCamlDBI friendly interface *)

type t =
  [ `Int of int
  | `String of string
  | `Null ]

  (** @return columns for Sort, Rel, and Obj respectively *)
val columns_of_metadata:
  (UriManager.uri * string * MetadataTypes.metadata list) list ->
    t list list * t list list * t list list

(*
val pp_columns: ?sep:string -> t list list * t list list * t list list -> string
*)

val pp_relation: MetadataTypes.relation -> string