You can search for identifiers within the package.
in-package search v0.2.0
type key
type 'data t
val create : unit -> 'data t
val clear : 'data t -> unit
val add : key -> 'data -> 'data t -> unit
val find : key -> 'data t -> 'data
val iter : (key -> 'data -> unit) -> 'data t -> unit