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diff --git a/src/GF/Compile/Update.hs b/src/GF/Compile/Update.hs
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+----------------------------------------------------------------------
+-- |
+-- Module      : Update
+-- Maintainer  : AR
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/05/30 18:39:44 $ 
+-- > CVS $Author: aarne $
+-- > CVS $Revision: 1.8 $
+--
+-- (Description of the module)
+-----------------------------------------------------------------------------
+
+module GF.Compile.Update (updateRes, buildAnyTree, combineAnyInfos, unifyAnyInfo,
+	       -- * these auxiliaries should be somewhere else 
+	       -- since they don't use the info types
+	       groupInfos, sortInfos, combineInfos, unifyInfos,
+	       tryInsert, unifAbsDefs, unifConstrs
+	      ) where
+
+import GF.Infra.Ident
+import GF.Grammar.Grammar
+import GF.Grammar.PrGrammar
+import GF.Infra.Modules
+
+import GF.Data.Operations
+
+import Data.List
+import Control.Monad
+
+-- | update a resource module by adding a new or changing an old definition
+updateRes :: SourceGrammar -> Ident -> Ident -> Info -> SourceGrammar
+updateRes gr@(MGrammar ms) m i info = MGrammar $ map upd ms where
+  upd (n,mod) 
+    | n /= m = (n,mod)
+    | n == m = case mod of
+       ModMod r -> (m,ModMod $ updateModule r i info)
+       _ -> (n,mod) --- no error msg
+
+-- | combine a list of definitions into a balanced binary search tree
+buildAnyTree :: [(Ident,Info)] -> Err (BinTree Ident Info)
+buildAnyTree ias = do
+  ias' <- combineAnyInfos ias
+  return $ buildTree ias'
+
+
+-- | unifying information for abstract, resource, and concrete
+combineAnyInfos :: [(Ident,Info)] -> Err [(Ident,Info)]
+combineAnyInfos = combineInfos unifyAnyInfo
+
+unifyAnyInfo :: Ident -> Info -> Info -> Err Info
+unifyAnyInfo c i j = errIn ("combining information for" +++ prt c) $ case (i,j) of
+  (AbsCat mc1 mf1, AbsCat mc2 mf2) -> 
+    liftM2 AbsCat (unifPerhaps mc1 mc2) (unifConstrs mf1 mf2) -- adding constrs
+  (AbsFun mt1 md1, AbsFun mt2 md2) -> 
+    liftM2 AbsFun (unifPerhaps mt1 mt2) (unifAbsDefs md1 md2) -- adding defs
+
+  (ResParam mt1, ResParam mt2) -> liftM ResParam $ unifPerhaps mt1 mt2
+  (ResOper mt1 m1, ResOper mt2 m2) -> 
+    liftM2 ResOper (unifPerhaps mt1 mt2) (unifPerhaps m1 m2)
+
+  (CncCat mc1 mf1 mp1, CncCat mc2 mf2 mp2) -> 
+    liftM3 CncCat (unifPerhaps mc1 mc2) (unifPerhaps mf1 mf2) (unifPerhaps mp1 mp2)
+  (CncFun m mt1 md1, CncFun _ mt2 md2) -> 
+    liftM2 (CncFun m) (unifPerhaps mt1 mt2) (unifPerhaps md1 md2) ---- adding defs
+-- for bw compatibility with unspecified printnames in old GF
+  (CncFun Nothing Nope (Yes pr),_) -> 
+    unifyAnyInfo c (CncCat Nope Nope (Yes pr)) j 
+  (_,CncFun Nothing Nope (Yes pr)) -> 
+    unifyAnyInfo c i (CncCat Nope Nope (Yes pr)) 
+
+  _ -> Bad $ "cannot unify informations in" ++++ show i ++++ "and" ++++ show j
+
+--- these auxiliaries should be somewhere else since they don't use the info types
+
+groupInfos :: Eq a => [(a,b)] -> [[(a,b)]]
+groupInfos = groupBy (\i j -> fst i == fst j)
+
+sortInfos :: Ord a => [(a,b)] -> [(a,b)]
+sortInfos = sortBy (\i j -> compare (fst i) (fst j))
+
+combineInfos :: Ord a => (a -> b -> b -> Err b) -> [(a,b)] -> Err [(a,b)]
+combineInfos f ris = do
+  let riss = groupInfos $ sortInfos ris
+  mapM (unifyInfos f) riss
+
+unifyInfos :: (a -> b -> b -> Err b) -> [(a,b)] -> Err (a,b)
+unifyInfos _ [] = Bad "empty info list"
+unifyInfos unif ris = do
+  let c = fst $ head ris
+  let infos = map snd ris
+  let ([i],is) = splitAt 1 infos 
+  info <- foldM (unif c) i is
+  return (c,info)
+
+
+tryInsert :: Ord a => (b -> b -> Err b) -> (b -> b) ->
+             BinTree a b -> (a,b) -> Err (BinTree a b)
+tryInsert unif indir tree z@(x, info) = case justLookupTree x tree of
+  Ok info0 -> do
+    info1 <- unif info info0
+    return $ updateTree (x,info1) tree 
+  _ -> return $ updateTree (x,indir info) tree
+
+{- ----
+case tree of
+ NT -> return $ BT (x, indir info) NT NT
+ BT c@(a,info0) left right 
+   | x < a  -> do
+       left' <- tryInsert unif indir left z    
+       return $ BT c left' right 
+   | x > a  -> do
+       right' <- tryInsert unif indir right z    
+       return $ BT c left right' 
+   | x == a -> do
+       info' <- unif info info0
+       return $ BT (x,info') left right
+-}
+
+--- addToMaybeList m c = maybe (return c) (\old -> return (c ++ old)) m
+
+unifAbsDefs :: Perh Term -> Perh Term -> Err (Perh Term)
+unifAbsDefs p1 p2 = case (p1,p2) of
+  (Nope, _)  -> return p2
+  (_, Nope)  -> return p1
+  (Yes (Eqs bs), Yes (Eqs ds)) -> return $ yes $ Eqs $ bs ++ ds --- order!
+  _ -> Bad "update conflict for definitions"
+
+unifConstrs :: Perh [Term] -> Perh [Term] -> Err (Perh [Term])
+unifConstrs p1 p2 = case (p1,p2) of
+  (Nope, _)  -> return p2
+  (_, Nope)  -> return p1
+  (Yes bs, Yes ds) -> return $ yes $ bs ++ ds
+  _ -> Bad "update conflict for constructors"