You can search for identifiers within the package.
in-package search v0.2.0
type name = string
type version = string
type vpkg = string * (string * string) option
type veqpkg = string * (string * string) option
type architecture = string
type md5sum = Digest.t
type sha1 = string
type sha256 = string
type file_size = int64
type filename = string
module Version : sig ... end
module Release : sig ... end
module Source : sig ... end
module Binary : sig ... end
module Control : sig ... end
module Changelog = DFChangelog
module Watch = DFWatch
module URI : sig ... end