type int type float type string con tag :: {Unit} -> {Unit} -> Type con xml :: {Unit} -> Type val cdata : ctx ::: {Unit} -> string -> xml ctx val tag : outer ::: {Unit} -> inner ::: {Unit} -> tag outer inner -> xml inner -> xml outer val join : shared :: {Unit} -> ctx1 ::: {Unit} -> ctx1 ~ shared -> ctx2 ::: {Unit} -> ctx2 ~ shared -> xml (shared ++ ctx1) -> xml (shared ++ ctx2) -> xml shared val head : tag [Html] [Head] val title : tag [Head] []