val date : ?month:int -> ?day:int -> ?hour:int -> ?minute:int -> ?second:int -> ?millisecond:int -> ?display_date:string -> int -> Timeline_types.dateval text : ?headline:string -> string -> Timeline_types.textval media : ?caption:string -> ?credit:string -> ?thumbnail:string -> ?alt:string -> ?title:string -> ?link:string -> ?target:string -> string -> Timeline_types.mediaval slide : ?end_date:Timeline_types.date -> ?text:Timeline_types.text -> ?media:Timeline_types.media -> ?group:string -> ?display_date:string -> ?background:Json_repr.any -> ?autolink:bool -> ?id:string -> Timeline_types.date -> Timeline_types.slideval era : ?text:Timeline_types.text -> Timeline_types.date -> Timeline_types.date -> Timeline_types.eraval timeline : ?title:Timeline_types.slide -> ?eras:Timeline_types.era list -> ?scale:string -> Timeline_types.slide list -> Timeline_types.timeline