+(*
+ ||M|| This file is part of HELM, an Hypertextual, Electronic
+ ||A|| Library of Mathematics, developed at the Computer Science
+ ||T|| Department, University of Bologna, Italy.
+ ||I||
+ ||T|| HELM is free software; you can redistribute it and/or
+ ||A|| modify it under the terms of the GNU General Public License
+ \ / version 2 or (at your option) any later version.
+ \ / This software is distributed as is, NO WARRANTY.
+ V_______________________________________________________________ *)
+
+module L = List
+module U = NUri
+module C = Cps
+module E = Entity
+module G = Options
+
+type csys = {
+ uri: E.uri;
+ mutable is : int list
+}
+
+let mark a = E.mark C.err C.start a
+
+(* interface functions ******************************************************)
+
+let init () = {
+ uri = U.uri_of_string (G.get_baseuri ());
+ is = [];
+}
+
+let add_infinite s a =
+ if !G.si && !G.cc then
+ let i = abs (mark a) in
+ if L.mem i s.is then () else s.is <- i :: s.is
+ else ()