+
+val setm : t -> path -> string option -> value option -> int
+ (** [setm t base sub value] sets [value] as new value for all the
+ nodes under [base] that match [sub] (or all, if [sub] is
+ [None]).
+
+ Returns the number of nodes modified. *)
+
+val transform : t -> string -> string -> transform_mode -> unit
+ (** [transform t lens file mode] adds or removes (depending on
+ [mode]) the transformation of the specified [lens] for [file]. *)
+
+val source : t -> path -> path option
+ (** [source t path] returns the path to the node representing the
+ file to which [path] belongs, or [None] if [path] does not
+ represent any file. *)