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diff --git a/helm/ocaml/xml/xml.mli b/helm/ocaml/xml/xml.mli
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+(* Copyright (C) 2000, 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://cs.unibo.it/helm/.
+ *)
+
+(******************************************************************************)
+(*                                                                            *)
+(*                               PROJECT HELM                                 *)
+(*                                                                            *)
+(*                     A tactic to print Coq objects in XML                   *)
+(*                                                                            *)
+(*                Claudio Sacerdoti Coen <sacerdot@cs.unibo.it>               *)
+(*                                 18/10/2000                                 *)
+(*                                                                            *)
+(* This module defines a pretty-printer and the stream of commands to the pp  *)
+(*                                                                            *)
+(******************************************************************************)
+
+(* Tokens for XML cdata, empty elements and not-empty elements           *)
+(* Usage:                                                                *)
+(*  Str cdata                                                            *)
+(*  Empty (element_name, [attrname1, value1 ; ... ; attrnamen, valuen]   *)
+(*  NEmpty (element_name, [attrname1, value2 ; ... ; attrnamen, valuen], *)
+(*          content                                                      *)
+type token =
+  | Str of string
+  | Empty of string * (string * string) list
+  | NEmpty of string * (string * string) list * token Stream.t
+
+(* currified versions of the token constructors make the code more readable *)
+val xml_empty : string -> (string * string) list -> token Stream.t
+val xml_nempty :
+  string -> (string * string) list -> token Stream.t -> token Stream.t
+val xml_cdata : string -> token Stream.t
+
+(* The pretty printer for streams of token                                  *)
+(* Usage:                                                                   *)
+(*  pp tokens None     pretty prints the output on stdout                   *)
+(*  pp tokens (Some filename) pretty prints the output on the file filename *)
+val pp : ?quiet:bool -> token Stream.t -> string option -> unit