ex2 [] = []
ex2 ((Paragraph):xs) = "<p>"++ex2 xs
ex2 ((Text s):xs) = s++ex2 xs
ex2 ((Link l d):xs) = "<link: "++l++" desc: "++d++">"++ex2 xs
ex2 [] = []
ex2 ((Paragraph):xs) = "<p>"++ex2 xs
ex2 ((Text s):xs) = s++ex2 xs
ex2 ((Link l d):xs) = "<link: "++l++" desc: "++d++">"++ex2 xs