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datatype list a = Nil | Cons of a * list a
fun isNil (t ::: Type) (ls : list t) : bool =
case ls of
Nil => True
| Cons _ => False
(*fun append (t ::: Type) (ls1 : list t) (ls2 : list t) : list t =
case ls1 of
Nil => ls2
| Cons (x, ls1') => Cons (x, append ls1' ls2)
fun delist (ls : list string) : xml body [] [] =
case ls of
Nil => <body>Nil</body>
| Cons (h, t) => <body>{cdata h} :: {delist t}</body>*)
val ls = Cons ("X", Cons ("Y", Cons ("Z", Nil)))
fun main () : transaction page = return <html><body>
{if isNil ls then <body>It's Nil.</body> else <body>It's not Nil.</body>}
</body></html>
(* <p>{delist ls}</p>*)
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