xoa: new binary for the generation of multiple logical constants

[helm.git] / matita / components / binaries / xoa / ast.ml

diff --git a/matita/components/binaries/xoa/ast.ml b/matita/components/binaries/xoa/ast.ml
new file mode 100644 (file)
index 0000000..4de0c10
--- /dev/null
+++ b/matita/components/binaries/xoa/ast.ml
@@ -0,0 +1,21 @@
+(*
+    ||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 arity = int
+
+type subarity = int
+
+type directive = Exists of arity * subarity
+               | Or of arity
+
+let mk_exists c v = Exists (c, v)
+
+let mk_or c = Or c