You can search for identifiers within the package.
in-package search v0.2.0
obus.network_manager
Nm_interfaces.Org_freedesktop_NetworkManager_Device_Serial
val interface : OBus_name.interface
val s_PppStats : (int32 * int32) OBus_member.Signal.t
val make : unit -> 'a OBus_object.interface