+++ /dev/null
-(* 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://www.cs.unibo.it/helm/.
- *)
-
-(******************************************************************************)
-(* *)
-(* PROJECT HELM *)
-(* *)
-(* Ferruccio Guidi <fguidi@cs.unibo.it> *)
-(* Irene Schena <schena@cs.unibo.it> *)
-(* 10/09/2002 *)
-(* *)
-(* *)
-(******************************************************************************)
-
-
-(* output data structures ***************************************************)
-
-type path = string * (string list) (* the name of an attribute *)
-
-type value = string list (* the value of an attribute *)
-
-type attribute = path * value (* an attribute *)
-
-type attribute_group = attribute list (* a group of attributes *)
-
-type attribute_set = attribute_group list (* the attributes of an URI *)
-
-type resource = string * attribute_set (* an attributed URI *)
-
-type resource_set = resource list (* the query result *)
-
-type result = resource_set
-
-
-(* input data structures ****************************************************)
-
-type svar = string (* the name of a variable for a resource set *)
-
-type rvar = string (* the name of a variable for a resource *)
-
-type vvar = string (* the name of a variable for an attribute value *)
-
-type inverse = bool
-
-type refine = RefineExact
- | RefineSub
- | RefineSuper
-
-type assign = path * path
-
-type set_exp = SVar of svar
- | RVar of rvar
- | Ref of val_exp
- | Pattern of val_exp
- | Relation of inverse * refine * path * set_exp * assign list
- | Select of rvar * set_exp * boole_exp
- | Union of set_exp * set_exp
- | Intersect of set_exp * set_exp
- | Diff of set_exp * set_exp
- | LetSVar of svar * set_exp * set_exp
- | LetVVar of vvar * val_exp * set_exp
-
-and boole_exp = False
- | True
- | Not of boole_exp
- | Ex of rvar list * boole_exp
- | And of boole_exp * boole_exp
- | Or of boole_exp * boole_exp
- | Sub of val_exp * val_exp
- | Meet of val_exp * val_exp
- | Eq of val_exp * val_exp
-
-and val_exp = Const of string list
- | RefOf of set_exp
- | Record of rvar * path
- | VVar of vvar
- | Property of inverse * refine * path * val_exp
- | Fun of string * val_exp
-
-type query = set_exp