type int
type float
type string

type unit = {}


con tag :: {Type} -> {Unit} -> {Unit} -> {Type} -> {Type} -> Type


con xml :: {Unit} -> {Type} -> {Type} -> Type
val cdata : ctx ::: {Unit} -> use ::: {Type} -> bind ::: {Type} -> string -> xml ctx use bind
val tag : attrsGiven ::: {Type} -> attrsAbsent ::: {Type} -> attrsGiven ~ attrsAbsent
        -> ctxOuter ::: {Unit} -> ctxInner ::: {Unit}
        -> useOuter ::: {Type} -> useInner ::: {Type} -> useOuter ~ useInner
        -> bindOuter ::: {Type} -> bindInner ::: {Type} -> bindOuter ~ bindInner
        -> $attrsGiven
        -> tag (attrsGiven ++ attrsAbsent) ctxOuter ctxInner useOuter bindOuter
        -> xml ctxInner useInner bindInner
        -> xml ctxOuter (useOuter ++ useInner) (bindOuter ++ bindInner)
val join : ctx ::: {Unit} 
        -> use1 ::: {Type} -> bind1 ::: {Type} -> bind2 ::: {Type}
        -> use1 ~ bind1 -> bind1 ~ bind2
        -> xml ctx use1 bind1
        -> xml ctx (use1 ++ bind1) bind2
        -> xml ctx use1 (bind1 ++ bind2)


con xhtml = xml [Html]
con page = xhtml [] []

con html = [Html]
con head = [Head]
con body = [Body]
con form = [Body, Form]

val head : unit -> tag [] html head [] []
val title : unit -> tag [] head [] [] []

val body : unit -> tag [] html body [] []
con bodyTag = fn attrs :: {Type} => ctx ::: {Unit} -> [Body] ~ ctx -> unit
        -> tag attrs ([Body] ++ ctx) ([Body] ++ ctx) [] []

val p : bodyTag []
val b : bodyTag []
val i : bodyTag []
val font : bodyTag [Size = int, Face = string]

val h1 : bodyTag []
val li : bodyTag []

val a : bodyTag [Link = page]

val form : unit -> tag [] [Body] [Form] [] []