You can search for identifiers within the package.
in-package search v0.2.0
type t = string list * string list * (Event.t -> string)
val register : string -> t -> unit
val register_unnamed : t -> string
val get : string -> t
val minimal : t
val simple : t
val default : t
val pattern : string list -> string list -> string -> t
val html : t
val csv : string -> string list -> t