You can search for identifiers within the package.
in-package search v0.2.0
type block = [
| `I of string * string
| `Noblank
| `P of string
| `S of string
]
type title = string * int * string * string * string
type t = title * block list
val print : ?subst:(string -> string) -> [ `Groff | `Pager | `Plain ] -> Format.formatter -> t -> unit