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type fruit = int
table fruit : { Id : fruit, Nam : string, Weight : float, Secret : string }
PRIMARY KEY Id,
CONSTRAINT Nam UNIQUE Nam
(* Everyone may knows IDs and names. *)
policy sendClient (SELECT fruit.Id, fruit.Nam
FROM fruit)
(* The weight is sensitive information; you must know the secret. *)
policy sendClient (SELECT fruit.Weight, fruit.Secret
FROM fruit
WHERE known(fruit.Secret))
fun main () =
x1 <- queryX (SELECT fruit.Id, fruit.Nam
FROM fruit
WHERE fruit.Nam = "apple")
(fn x => <xml><li>{[x.Fruit.Id]}: {[x.Fruit.Nam]}</li></xml>);
return <xml><body>
<ul>{x1}</ul>
</body></xml>
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