type node_type = Leaf | Tag | Other

type ref_node_data = {
    node_type: node_type;
    constraints: (Value_checker.value_constraint list);
    help: string;
    value_help: (string * string) list;
    constraint_error_message: string;
    multi: bool;
    valueless: bool;
    owner: string option;
    keep_order: bool;
}

exception Validation_error of string

type t = ref_node_data Vytree.t

val default_data : ref_node_data

val load_from_xml : t -> string -> t

val validate_path : (string, string) Hashtbl.t -> t -> string list -> string list * string option

val is_multi : t -> string list -> bool