2 ||M|| This file is part of HELM, an Hypertextual, Electronic
3 ||A|| Library of Mathematics, developed at the Computer Science
4 ||T|| Department, University of Bologna, Italy.
6 ||T|| HELM is free software; you can redistribute it and/or
7 ||A|| modify it under the terms of the GNU General Public License
8 \ / version 2 or (at your option) any later version.
9 \ / This software is distributed as is, NO WARRANTY.
10 V_______________________________________________________________ *)
16 type qid = id * bool * id list (* qualified identifier: name, local?, path *)
18 type term = Sort of bool (* sorts: true = TYPE, false = PROP *)
19 | GRef of qid * term list (* reference: name, arguments *)
20 | Appl of term * term (* application: argument, function *)
21 | Abst of id * term * term (* abstraction: name, domain, scope *)
23 type command = Section of (bool * id) option (* section: Some true = open, Some false = reopen, None = close last *)
24 | Context of qid option (* context: Some = last node, None = root *)
25 | Block of id * term (* block opener: name, domain *)
26 | Decl of id * term (* declaration: name, domain *)
27 | Def of id * term * bool * term (* definition: name, domain, transparent?, body *)