Of course, to say "<" ++ tag ++ ">" is very ugly, so you'd want to write it as angle tag. angle is a function? How is it implemented? In typical function programming style:
angle :: String -> String
angle s = surround "<" ">" s
{- This can, in "points free" style, be written:
angle = surround "<" ">" -- look ma, no explicit variable!
-}
surround :: String -> String -> String -> String
surround start end text = start ++ text ++ end
-- The idea is to reuse surround:
quote = surround "'" "'"
bracket = surround "[" "]"
braces = surround "{" "}"
... etc.
But this is straying off-topic for this site...
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