[Haskell-cafe] Constructing a datatype given just its constructor as a string?

[Hugh Perkins]

Trying to create a datatype/constructor given just its constructor as a
string, something like:

mkConstr :: String -> Constr
parseData :: (Data a) => String -> a

***without knowing in advance anything about the datatype apart from the
string contents***

So, not something like:

parseData "Just 3" :: [Maybe]

but simply:

parseData "Just 3"

(This is linked to the other post: the goal is to be able to deserialize xml
without needing to know in advance the data type we are deserializing)
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