Hi Fernand,
Everything works fine except for the fact that all the nodes « <this> </this> » (that is, a space (an XML text node whose contents are a single space character) within a <this> element node) get transformed to a « <this/> » element
I can't really reproduce this: A simple ghci session gives the following: ----------------------------------- uwe@si:~/haskell/hxt/curr/examples/arrows/HelloWorld> ghci HelloWorld.hs GHCi, version 6.8.1: http://www.haskell.org/ghc/ :? for help Loading package base ... linking ... done. [1 of 1] Compiling Main ( HelloWorld.hs, interpreted ) Ok, modules loaded: Main. *Main> runX $ (readString [(a_validate,v_0)] "<x> </x>" >>> writeDocumentToString []) Loading ... ... ["<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<x> </x>"] *Main> runX $ ( readString [(a_validate,v_0)] "<x> </x>" >>> setTraceLevel 4 >>> traceDoc "doc after reading" >>> setTraceLevel 0 >>> writeDocumentToString []) -- (1) doc after reading <x> </x> content of: "<x> </x>" ====================== ---XTag "/" | "source"="\"<x> </x>\"" | "encoding"="UNICODE" | "transfer-URI"="string:" | "transfer-Message"="OK" | "transfer-Status"="200" | "transfer-Encoding"="UNICODE" | +---XTag "x" | +---XText " " ["<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<x> </x>"] *Main> -------------------------------------- So there is a text node containing the space char after parsing and it stays in the output document. Cheer, Uwe -- Web: http://www.fh-wedel.de/~si/