(* Enlivening Expressions *)
| Maction of attr * mpres list
-and
+and row = Mtr of attr * mtd list
- row = Mtr of attr * mtd list
+and mtd = Mtd of attr * mpres
-and
-
- mtd = Mtd of attr * mpres
-
-and
-
- attr = (string * string) list
+and attr = (string option * string * string) list
;;