You can search for identifiers within the package.
in-package search v0.2.0
type 'a t = 'a S.t
type token = X.token
val emit_pi : string -> string -> token t
val emit_start_tag : string -> (string * string) list -> bool -> token t
val emit_end_tag : string -> token t
val emit_doctype : doctype -> token t
val emit_text : string -> token t
val emit_eof : unit -> token t