(*
    ||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_______________________________________________________________ *)

type uri = Entity.uri
type id = Entity.id

type term = Sort of bool                  (* sorts: true = TYPE, false = PROP *)
	  | LRef of int * int             (* local reference: local environment length, de bruijn index *)
	  | GRef of int * uri * term list (* global reference: local environment length, name, arguments *)
	  | Appl of term * term           (* application: argument, function *)
	  | Abst of id * term * term      (* abstraction: name, domain, scope *)

type pars = (id * term) list (* parameter declarations: name, type *)

type entry = pars * term * term option (* parameters, domain, body *)

type entity = entry Entity.entity