Thanks for helping me out again. Now I made it through to the XML-Tools but unfortunatly they brought me another error. Below the error message I copied the 2 lines mentioned there (220 and 222) from the haskell file. cd tools; hmake DtdToHaskell -I../lib -package text ghc -package text -I../lib -c -o DtdToTypeDefPP.o DtdToTypeDefPP.hs DtdToTypeDefPP.hs:220: Data constructor not in scope: `DefaultTo' DtdToTypeDefPP.hs:222: Data constructor not in scope: `DefaultTo' Compilation had errors make: *** [DtdToHaskell] Error 1 bash-2.04$ ---------- mkAttrField e (AttDef n StringType (DefaultTo (AttValue [Left s]) f)) = (name_f e n, Defaultable String s) mkAttrField e (AttDef n _ (DefaultTo (AttValue [Left s]) f)) = (name_f e n, Defaultable (Defined (name n)) (mangle s))