+ [ `Loc of location (* source file location *)
+ | `IdRef of string (* ACic pointer *)
+ | `Level of int * Gramext.g_assoc (* precedence, associativity *)
+ | `ChildPos of child_pos (* position of l1 pattern variables *)
+ | `XmlAttrs of (string option * string * string) list
+ (* list of XML attributes: namespace, name, value *)
+ | `Raw of string (* unparsed version *)