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con t ctx data = list (data * xml ctx [] [] * source bool)
fun create [ctx] [data] (items : list (data * xml ctx [] [] * bool)) =
List.mapM (fn (d, x, b) => s <- source b; return (d, x, s)) items
fun render [ctx] [data] [[Body] ~ ctx] (t : t ([Body] ++ ctx) data) =
List.mapX (fn (_, x, s) => <xml><ccheckbox source={s}/> {x}<br/></xml>) t
fun selected [ctx] [data] (t : t ctx data) =
List.foldlM (fn (d, _, s) ls =>
s <- signal s;
return (if s then
d :: ls
else
ls)) [] t
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