Running Haskell HXT outside of IO?

Question

All the examples I\'ve seen so far using the Haskell XML toolkit, HXT, uses runX to execute the parser. runX runs inside the IO monad. Is there a w

Answer 1

Travis Brown's answer was very helpful. I just want to add my own solution here, which I think is a bit more general (using the same functions, just ignoring the problem-specific issues).

I was previously unpickling with:

upIO      :: XmlPickler a => String -> IO [a]
upIO str   = runX $ readString [] str >>> arrL (maybeToList . unpickleDoc xpickle)

which I was able to change to this:

upPure    :: XmlPickler a => String -> [a]
upPure str = runLA (xreadDoc >>> arrL (maybeToList . unpickleDoc xpickle)) str

I completely agree with him that doing this gives you less control over the configuration of the parser etc, which is unfortunate.