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module Validate where
import Data.Maybe
import Text.XML.HXT.Core
import Text.XML.HXT.RelaxNG
loadSchema :: String -> IO (Maybe XmlTree)
loadSchema schema =
runX ( validateSchemaWithRelax schema ) >>= return . listToMaybe
validateWithSchema :: XmlTree -> XmlTree -> Maybe String
validateWithSchema schema doc
= listToMaybe $
runLA
( validateRelax' schema
>>>
getErrorMsg
) doc
main1 :: String -> String -> IO ()
main1 sf df
= do
schema <- loadSchema sf >>= return . fromJust
doc <- runX ( readDocument [ withValidate no ] df ) >>= return . head
case validateWithSchema schema doc of
Just e -> putStrLn $ "Document " ++ show df ++ " is not valid for schema " ++ show sf ++ ": " ++ e
Nothing -> putStrLn $ "Document " ++ show df ++ " is valid for schema " ++ show sf
main :: IO ()
main
= do
main1 "valid1.rng" "valid1.xml"
main1 "valid1.rng" "invalid1.xml"
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