diff --git a/ChangeLog.md b/ChangeLog.md
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--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,8 @@
+ChangeLog for replaceUmlaut  
+
+0.1.5.1 base 
+0.1.5.2 changes to integrate into daino and ghc 9.4.4.
+0.1.5.3 report changes  
+     removed dependency completeMeta  
+     removed the mapp (merged with other)
+     updated readme etc. 
diff --git a/GPL_3 b/GPL_3
new file mode 100644
--- /dev/null
+++ b/GPL_3
@@ -0,0 +1,674 @@
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,43 @@
+
+---
+# Replacement of ae oe ue by the UTF-8 umlaut-glyph ä ö ü
+
+ReplaceUmlaut processes a `txt` or `md` file (or all `md` files in a directory) and replaces the umlaut to its proper form (possibly capitalized). It uses an extensible list to avoid replacements which are not appropriate.
+
+## The file nichtUmlaut.txt lists exceptions
+An extensible list of parts of words which contain character 
+combinations which should not be replaced; for example, Koeffizient. The list needs only contain parts of words (i.e. koeff) not a complete list of all words with non-replaceable combinations. 
+
+## Command Line Use 
+The command `replaceUmlaut filepath` processes just the file and returns the changed file (the original is renamed with extension `bak`). 
+Switches: 
+    - `-m directory` processes all `md` files in the directory.
+    - `-d` is a debug option; files are not changed, but a changed version is returned with extension `new`. 
+
+## Function 
+
+The function `procMd1` is useful to process a single `md` file in a program. The list of permitted combinations must be passed as an argument. It returns True if the file is changed.
+Typical use is 
+
+````haskell
+    changed <- header
+        then  do 
+            erl1 <- readErlaubt  fnErlaubt
+            let addErl = dyDoNotReplace . meta1 $ doc1
+                -- allow additions to the list in the YAML header
+                erl2 = addErl -- add erl1
+            changed1 <- applyReplace debugReplace erl2   fnin 
+            return changed1
+````
+
+
+<!-- ## Source: 
+### in app is Main.hs
+this is the main for the utility which converts all md files for myHomepage. it looks at the value of *language* and converts only files which have *de_AT*, *de_CH*, or *de_DE*. 
+conversion of test in the yaml header is not converted!
+
+### Lib contains 
+- ProcTxt.hs 
+- ProcWord.hs
+which are the actual conversion routines -->
+
diff --git a/ReplaceUmlaut.cabal b/ReplaceUmlaut.cabal
new file mode 100644
--- /dev/null
+++ b/ReplaceUmlaut.cabal
@@ -0,0 +1,109 @@
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.35.2.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: ac539c423172119c73a937299c82f7cd3b83abf488e9577f1d956b58d51c165c
+
+name:           ReplaceUmlaut
+version:        0.1.5.3
+synopsis:       converting text to properly encoded german umlauts
+description:    converts the convenient ae, oe and ue replacements for german 
+                umlauts into their proper UTF-8 encoded umlauts - 
+                respecting cases where the ae, oe and ue must remain
+                based on a extensible list.
+                Treats a file completely. 
+category:       Text
+homepage:       https://github.com/andrewufrank/u4blog.git#readme
+bug-reports:    https://github.com/andrewufrank/u4blog.git/issues
+author:         Andrew Frank
+maintainer:     Andrew U. Frank <andrewufrank@gmail.com>
+copyright:      2021 Andrew U. Frank
+license:        GPL
+license-file:   GPL_3
+build-type:     Simple
+extra-source-files:
+    ChangeLog.md
+    README.md
+    nichtUmlaute.txt
+
+source-repository head
+  type: git
+  location: https://github.com/andrewufrank/u4blog.git
+  subdir: uniform-cmdLineArgs
+
+library
+  exposed-modules:
+      Lib.FileHandling
+      Lib.OneMDfile
+      Lib.ProcDirMD
+      Lib.ProcTextFile
+      Lib.ProcTxt
+      Lib.ProcWord
+      ReplaceUmlaut
+  other-modules:
+      Paths_ReplaceUmlaut
+  hs-source-dirs:
+      src
+  build-depends:
+      base >=4.7 && <5
+    , dir-traverse
+    , optparse-applicative
+    , text
+    , transformers
+    , uniform-cmdLineArgs
+    , uniform-fileio
+    , uniform-json >=0.1.5
+    , uniform-pandoc
+    , uniformBase >=0.1.5
+  default-language: Haskell2010
+
+executable replaceUmlaut
+  main-is: Main.hs
+  other-modules:
+      Paths_ReplaceUmlaut
+  hs-source-dirs:
+      app
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      ReplaceUmlaut
+    , base >=4.7 && <5
+    , dir-traverse
+    , optparse-applicative
+    , text
+    , transformers
+    , uniform-cmdLineArgs
+    , uniform-fileio
+    , uniform-json >=0.1.5
+    , uniform-pandoc
+    , uniformBase >=0.1.5
+  default-language: Haskell2010
+
+test-suite test1
+  type: exitcode-stdio-1.0
+  main-is: Testing.hs
+  other-modules:
+      Lib.FileHandling_test
+      Lib.OneMDfile_test
+      Lib.ProcText_test
+      Lib.ProcTxt_test
+      Lib.ProcWord_test
+      Paths_ReplaceUmlaut
+  hs-source-dirs:
+      tests
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      HTF
+    , ReplaceUmlaut
+    , base >=4.7 && <5
+    , dir-traverse
+    , optparse-applicative
+    , text
+    , transformers
+    , uniform-cmdLineArgs
+    , uniform-fileio
+    , uniform-json >=0.1.5
+    , uniform-pandoc
+    , uniformBase
+  default-language: Haskell2010
diff --git a/app/Main.hs b/app/Main.hs
new file mode 100644
--- /dev/null
+++ b/app/Main.hs
@@ -0,0 +1,127 @@
+-----------------------------------------------------------------------------
+--
+-- Module      : the main for calling replaceUmlaut functions
+--    applied to specific files
+--    with a switch for the txt and the filename
+--    and recursively processing all md files 
+--    but not dealing with the yml header language switch
+-----------------------------------------------------------------------------
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+
+-- module ReplaceUmlaut where      -- must have Main (main) or Main where
+module  Main (main)  where
+
+-- import           Uniform.Convenience.StartApp
+import Uniform.CmdLineArgs
+import UniformBase
+-- import           Data.Semigroup                 ( (<>) )
+import           Lib.ProcTextFile
+import           Lib.ProcDirMD
+-- import           Lib.ProcPandocDatei
+-- import              Lib.OneMDfile
+import Lib.FileHandling
+import Paths_ReplaceUmlaut
+
+programName, progTitle :: Text
+programName = "Replace umlaut in txt file " :: Text
+progTitle =
+  "replace ae, oe, and ue to umlaut (except when in nichtUmlaute.txt)" :: Text
+
+-- to run add in .ghci -- tests/Testing.hs
+
+main :: IO ()
+main = do
+  startProg 
+    (unwords' [programName, progTitle])
+    (parseAndExecute
+      (unlinesT
+        [ "converts in the file given"
+        , "the umlaut written as ae, oe and ue"
+        , "to regular umlaut. "
+        , "execpt when in file nichtUmlaute"
+        , "which is the list of words where ae, oe or ue must remain"
+        ]
+      )
+      "the file (with extension .txt)"
+    )
+  return ()
+
+
+--- cmd line parsing
+data LitArgs = LitArgs 
+    { isDebug :: Bool   -- ^ switch to debug mode (unchanged file, NEW extension)
+    , isAllMD :: Bool   -- ^ collect all md files in directory
+      , argfile  :: String -- ^ the filename absolute
+      } deriving (Show)
+
+cmdArgs :: Parser (LitArgs)
+cmdArgs =
+  LitArgs
+    <$> switch 
+            (long "debug" <> short 'd' <> help 
+              "use debug mode; original file is unchange, new file with NEW extension attached")
+    <*> switch 
+            (long "all md" <> short 'm' <> help 
+              "process all md files in directory")
+    <*> argument str
+                 (
+      --   long "filename" <>
+                  metavar "filename or directory")
+
+parseAndExecute :: Text -> Text -> ErrIO ()
+parseAndExecute t1 t2 = do
+    args <- callIO $ execParser (opts2 cmdArgs t1 t2 )
+    putIOwords ["parseAndExecute LitArgs", showT args]
+    curr <- currentDir
+    -- let dir0 = makeAbsDir "/home/frank/additionalSpace/DataBig/LitOriginals"
+    let fn2     = argfile args :: FilePath
+    -- let isText  = isTxt args :: Bool
+    let debug   = isDebug args :: Bool
+    let allMD   = isAllMD args :: Bool
+
+    fnErl <- callIO $ getDataFileName "nichtUmlaute.txt"
+    let fnErlP = makeAbsFile fnErl
+            -- makeAbsFile "/home/frank/Workspace8/replaceUmlaut/nichtUmlaute.txt"
+    erl2  <- readErlaubt fnErlP
+ 
+    if allMD 
+        then do
+            let dir = curr </> makeRelDir fn2 :: Path Abs Dir
+            procDirMD debug erl2 dir
+        else do
+            let fn = curr </> makeRelFile fn2 :: Path Abs File
+            res <- procTextFile debug erl2 fn 
+            when res $ putIOwords ["parseAndExecute LitArgs file changed"]
+
+            -- let ext     = getExtension fn
+            -- let isText2 = isText || ext == (Extension "txt") || ext == (Extension "md")
+            -- if isText2 
+            --     then 
+                        
+            --     else 
+            --             procMd1 debug erl2 fn
+
+
+
+    -- differences in md test for language and if nothing to do
+        -- no new file is written
+        
+--  where
+--   opts = info (helper <*> cmdArgs)
+--               (fullDesc <> (progDesc . t2s $ t1) <> (header . t2s $ t2))
+
+
+
+  --cmd2textstate :: LitArgs -> TextState2
+  ---- fillst the textstate with directory and filename and proj
+  ---- language is by default english, buchcode is the same as proj
+  --cmd2textstate args  = fillTextState2 sourceTest4 generalityTest4
+  --                 (argdir args) (argbuch args)
+  --
diff --git a/nichtUmlaute.txt b/nichtUmlaute.txt
new file mode 100644
--- /dev/null
+++ b/nichtUmlaute.txt
@@ -0,0 +1,148 @@
+Paesa
+Emanuele
+zuein
+continue
+fluence
+neuer
+guetzli
+quest
+virtuel
+Guernsey
+individuel
+aktuel
+eventuel
+koeffi 
+issues
+accrue
+value
+squeeze
+question 
+unique
+poet 
+poes 
+steuer
+neue 
+freue
+steady
+sequen
+manuell 
+zuerst
+true
+phoenix
+klimaer
+zuerst
+revue
+OECD
+aktuell
+value
+israel
+marque
+lektuel
+bequem
+puerto
+venezuela
+samuel
+getreuen
+duel
+aero
+isreal
+visuel
+individue
+cinque
+aktuell
+baedeker
+braeburn
+kaeder
+embraer
+ghanaer
+ismael
+michael
+paella
+paestum
+phaeton
+rafael
+reggae
+vitae
+oboe
+apnoe
+autoe
+audioe
+bioe
+boeing
+bonhoeffer
+bruttoe
+chicagoer
+crusoe
+defoe
+diarrhoe
+echoe
+elektroe
+endoe
+exoe
+fotoe
+gastroe
+giroe
+goethe
+haloe
+heroe
+holoe
+homoe
+hydroe
+iso
+joe
+judoe
+kakaoe
+kinoe
+koex
+kommando
+kontoe
+logorhoe
+magnetoe
+makroe
+mikroe
+monroe
+nano
+nettoe
+neuroe
+noether
+opto
+osloer
+phoenix
+photoe
+piezoe
+poe
+poem
+poet
+protoe
+pseudoe
+psychoe
+radioe
+risikoe
+schroeder
+soeben
+soloe
+tempoe
+thermoe
+togoer
+torontoer
+videoe
+bauer
+baue
+aue
+teuer
+feuer
+flaue
+quenz
+eurt
+heuer
+kaue
+quer
+dauer
+albuquerque
+annuel
+raue
+schaue
+traue
+sexue
+quell
+aue
diff --git a/src/Lib/FileHandling.hs b/src/Lib/FileHandling.hs
new file mode 100644
--- /dev/null
+++ b/src/Lib/FileHandling.hs
@@ -0,0 +1,77 @@
+-----------------------------------------------------------------------------
+-- Module      :   Convert umlaut written as ae, oe or ue into ä, ö and ü
+--              in a single word
+-----------------------------------------------------------------------------
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+{-# OPTIONS_GHC -Wall -fno-warn-orphans #-}
+                -- -fno-warn-missing-signatures
+            -- -fno-warn-missing-methods 
+            
+module Lib.FileHandling  -- (openMain, htf_thisModuelsTests)
+                    where
+import UniformBase
+-- import           Uniform.Strings
+-- import           Uniform.FileIO
+import Uniform.Pandoc (extMD)
+
+textlinesFile :: TypedFile5 Text [Text]
+-- txtFile = makeTyped txtExtension
+textlinesFile = makeTyped txtExtension
+textlinesNewFile :: TypedFile5 Text [Text]
+textlinesNewFile = makeTyped newExtension 
+textlinesBakFile :: TypedFile5 Text [Text]
+textlinesBakFile = makeTyped bakExtension 
+
+mdFile :: TypedFile5 Text [Text]
+mdFile = makeTyped extMD
+
+txtExtension :: Extension
+txtExtension = Extension "txt" :: Extension
+newExtension :: Extension
+newExtension = Extension "new" :: Extension
+bakExtension :: Extension
+bakExtension = Extension "bak" :: Extension
+-- ^ filetype to read text in lines
+
+-- changeExtensionBakOrNew :: Bool -> Path Abs File -> ErrIO (Extension, Path Abs File, Path Abs File)
+-- -- ^ the given fn is split in extension and 
+-- -- returns the bak and the new file name  
+-- changeExtensionBakOrNew debug fn = do
+--     let fnNaked = makeAbsFile $ getParentDir fn </> getNakedFileName fn :: Path Abs File
+--     let fnExtension = getExtension fn :: Extension
+--     when debug $ putIOwords ["changeExtensionBakOrNew fnNaked", showT fnNaked, "fnExtension", showT fnExtension]
+ 
+--     let fnbak = fnNaked <.> bakExtension :: Path Abs File
+--     let fnnew = fnNaked <.> newExtension :: Path Abs File
+
+--     putIOwords ["changeExtensionBakOrNew fnbak", showT fnbak]
+--     putIOwords ["changeExtensionBakOrNew fnnew", showT fnnew]
+    
+--     return (fnExtension, fnbak, fnnew)
+
+instance TypedFiles7 Text [Text] where  -- creates sequence of lines
+  wrap7 t = lines' t  
+  unwrap7 t = unlines' t 
+
+readErlaubt :: Path Abs File -> ErrIO [Text]
+-- read the erlaubte words wtih ae, oe and ue
+readErlaubt fnErl = do
+  erl :: [Text] <- read8 fnErl textlinesFile -- reads lines
+  let erl2 =  concat . map words' $ erl :: [Text]
+  return erl2
+
+writeWithBak :: Bool -> Path Abs File -> TypedFile5 Text [Text]-> [Text] -> ErrIO () 
+-- ^ write the text into a file; use path given after renaming the file to bak
+--      if debug then write the text into a new file
+writeWithBak debug fn textLineType res = 
+    if debug 
+        then write8 fn textlinesNewFile res
+        else do 
+            renameToBak8 fn textLineType 
+            write8 fn textLineType res     
diff --git a/src/Lib/OneMDfile.hs b/src/Lib/OneMDfile.hs
new file mode 100644
--- /dev/null
+++ b/src/Lib/OneMDfile.hs
@@ -0,0 +1,133 @@
+-----------------------------------------------------------------------------
+-- Module      :   Convert umlaut written as ae, oe or ue into ä, ö and ü
+--              in a txt file
+-----------------------------------------------------------------------------
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.OneMDfile  -- (openMain, htf_thisModuelsTests)
+                           where
+import UniformBase
+import           Lib.ProcWord
+import           Lib.FileHandling   
+import Lib.ProcTextFile  
+-- import Lib.ProcPandocDatei
+-- import MdDocHandling
+
+-- for pandoc testing
+-- import           Uniform.Pandoc
+
+-- import qualified Text.Pandoc                   as P
+-- import qualified Text.Pandoc.Walk              as PW
+-- import qualified Data.Text   as T
+-- import Wave.MD2doc
+
+-- newExtension :: Extension
+-- newExtension = Extension "new" :: Extension
+-- mdFile = makeTyped extMD
+-- ^ filetype to read text in lines
+
+-- procMd3 :: Bool -> [Text]-> Path Abs File -> ErrIO ()
+-- procMd3 debug erl2 fn = do
+-- --   erl2               <- readErlaubt fnErl
+--   procMd1 debug erl2 fn 
+
+-- --   ls :: MarkdownText <- read8 fn markdownFileType
+--   putIOwords ["procMd3 done ",   "fn", showT fn]
+
+--   ls2 <- unPandocM (changeUmlautInPandoc True erl2 (ls))
+
+--   if debug
+--     then do
+--       let fnnew = makeAbsFile (toFilePath fn <> "NEW")
+--       putIOwords ["procMd result in new", showT fnnew]
+--       write8 fnnew markdownFileType ls2
+--       putIOwords ["procMd result in new written", showT ls2, "fn", showT fnnew]
+--     else do
+--       let fnrename = fn <.> bakExtension :: Path Abs File
+--       renameOneFile (fn <.> extMD) fnrename
+--       putIOwords ["procMd renamed to bak", showT fnrename]
+
+
+--   write8 fn markdownFileType ls2
+--   when debug $ putIOwords ["procMd done", showT ls2]
+
+procMd1 :: Bool -> [Text] -> Path Abs File -> ErrIO Bool
+-- ^ replace umlaut in a  markdown file and report if any change
+-- it is known that the file is german text and should be processed
+-- conversion unless it is an permitted group
+-- in a file with extension txt
+-- the original file is renamed to bak and the
+-- corrected version written to the original filename
+-- except when debug flag is set
+-- then the new file is written to NEW
+-- and the original file is not changed
+-- debug true gives new file
+-- returns False if something has changed
+procMd1 debug erl2 fn = do
+    when debug $ putIOwords ["\n procMD1 "
+        , "\tfile to process", showT fn
+        , "\terl2", showT erl2
+        ]
+
+    res <- procTextFile debug erl2 fn 
+    when debug $ putIOwords ["\n procMD1 done. Changes", showT res]
+    return res 
+
+    -- md1 <- read8 fn mdFile
+    -- dr@(Docrep yam1 pan1) <- readMarkdown2docrep md  
+
+    -- if "ngerman" /= dyLang yam1 
+    --     then do 
+    --         when debug $ putIOwords ["\n procMD1 ", "not german"]
+    --         return dr
+    --     else do 
+    --         when debug $ putIOwords ["\n procMD1 ", "german"]
+    --         return dr 
+
+    -- let f1 =   mdDocRead . unlines' $ f0 :: MdDoc1   -- definition in MdDocHandling
+    -- when debug $ putIOwords ["procMD1 yamlHeader", showT . yamlHeader1 $ f1]
+    -- let german = mdocIsGerman f1  -- check requires pandoc?
+
+    -- if german then  do 
+    --         -- let f2 = updateMdDoc2 (procMdTxt erl2) (procMdTxt erl2) f1
+    --         -- newfn <- changeExtensionBakOrNew debug fn  -- not debug?
+    --         -- let f3 = mdDocWrite f2 
+    --         let f3 =  map (procLine2 erl2)  f0 -- process the full file
+    --         writeWithBak debug fn mdFile f3
+    --         when True $ putIOwords ["\n procMd1 ", showT fn, "german file umlaut changed with backup"]
+    --     else
+    --         when debug $ putIOwords ["\n procMd1 ", showT fn, "not german file"]
+           
+
+    -- when debug $ putIOwords ["\n procMD1 ", showT fn, "file done with backup"]
+    -- return ()
+
+
+-- data Markdown = Markdown Text deriving (Show, Read, Eq, Ord)
+-- ^ just for marking md files
+-- mdFile :: TypedFile5 Text Markdown
+-- mdExtension :: Extension
+-- mdExtension = Extension "md" :: Extension
+
+
+
+-- procMdTxt2 :: [Text] ->  Text -> Text
+-- -- change all umlaut in text 
+-- -- preserve leading blanks of line, or tabs, but not mixture of these
+-- procMdTxt2 erl2 t = concat' [ld,t2]
+--     where
+--         t2 = unlines' . map (procLine erl2) . lines' $ t1 
+--         (ld, t1) = case mb1 t of
+--                 Nothing -> case mb2 t of 
+--                                 Nothing -> ("", t)
+--                                 Just (lead2, _, t02) -> (lead2,t02)
+--                 Just (lead, _, t0) ->  (lead,t0)
+--         mb1 tx = T.commonPrefixes "                  " tx
+--         mb2 ty = T.commonPrefixes "\t\t\t\t\t\t\t" ty
+
diff --git a/src/Lib/ProcDirMD.hs b/src/Lib/ProcDirMD.hs
new file mode 100644
--- /dev/null
+++ b/src/Lib/ProcDirMD.hs
@@ -0,0 +1,42 @@
+-----------------------------------------------------------------------------
+-- Module      :   Convert umlaut written as ae, oe or ue into ä, ö and ü
+--              in a txt file
+-----------------------------------------------------------------------------
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.ProcDirMD -- (openMain, htf_thisModuelsTests)
+                   where
+-- import Uniform.Strings
+-- import Uniform.TypedFile
+-- import           Uniform.FileIO
+-- import Uniform.Error
+import           Lib.ProcTextFile
+-- import Lib.ProcWord
+import UniformBase
+import Lib.FileHandling
+
+procDirMD :: Bool -> [Text] -> Path Abs Dir -> ErrIO ()
+-- ^ replace umlaut in all md files in directory (recursively!)
+procDirMD debug erl2 dir = do  
+    when debug $ putIOwords ["procDirMD start", showT dir]
+    -- pipedDoIOwithFilter :: Path Abs File -> Path Abs Dir -> Extension -> (Path Abs File -> ErrIO String) -> ErrIO ()
+    curr <- currentDir
+    let msgFile = curr </> makeRelFile "msg4procDir.txt"
+    bools <- pipedDoIOwithFilter msgFile dir (Extension "md") (procTxt0 debug erl2)
+
+    msg2 <- read8 msgFile textlinesFile
+    putIOwords ["processing for ", showT dir, "done with msg", showT msg2]
+    return ()
+
+procTxt0 :: Bool -> [Text] -> Path Abs File -> ErrIO String 
+procTxt0 debug erl2 fn = do 
+    when debug $ putIOwords ["procTxt0 start", showT fn]
+    procTextFile debug erl2 fn 
+    when debug $ putIOwords ["procTxt0 end", showT fn]
+    return . show $ fn
diff --git a/src/Lib/ProcTextFile.hs b/src/Lib/ProcTextFile.hs
new file mode 100644
--- /dev/null
+++ b/src/Lib/ProcTextFile.hs
@@ -0,0 +1,68 @@
+-----------------------------------------------------------------------------
+-- Module      :   Convert umlaut written as ae, oe or ue into ä, ö and ü
+--              in a txt file
+-----------------------------------------------------------------------------
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+{-# LANGUAGE BlockArguments #-}
+
+module Lib.ProcTextFile  -- (openMain, htf_thisModuelsTests)
+                   where
+-- import Uniform.Strings
+-- import Uniform.TypedFile
+-- import           Uniform.FileIO
+-- import Uniform.Error
+import           Lib.ProcWord
+import UniformBase
+import Lib.FileHandling
+import Uniform.Pandoc (extMD)
+import Control.Monad.Trans.Writer.Strict
+
+procTextFile :: Bool -> [Text] -> Path Abs File -> ErrIO Bool
+-- ^ replace umlaut unless it is an permitted group
+-- in a file with extension txt or md (only!)
+-- returns True if something has changed
+procTextFile debug erl2 fn = do
+    when debug $ putIOwords ["procText start", showT fn]
+    let fnExtension = getExtension fn :: Extension
+
+    let textLineType
+          | fnExtension == txtExtension = textlinesFile
+          | fnExtension == extMD = mdFile
+          | otherwise = errorT  ["ERROR: not text file - nothing done!"]
+
+    ls :: [Text] <- read8 fn textLineType  -- split in lines
+
+    -- when debug $ putIOwords ["procTxt ls", showT ls]
+    -- let ls2 = map (procLine2 erl2) ls
+    let (ls2,report) = runWriter $ mapM (procLine2Rep erl2) ls
+
+    -- when debug $ 
+    when debug $ putIOwords ["procText ls2", unlines' ls2]
+    when (trim' report /= zero) $ putIOwords ["\nprocText report",  report, "\n"]
+    -- putIOwords ["procText file returned", unlines' ls]
+    -- let ls3 = unwrap7 ls2 :: Text
+    -- when debug $ putIOwords ["procTxt unwrap7 . ls3", showT ls3]
+
+    let changed = zero /= trim' report -- no report means nothing changed 
+    when changed do 
+        writeWithBak debug fn textLineType (  ls2)
+        when True $ putIOwords ["procText changed file",  showNice fn, "rewritten"
+            , "\n if some words in the report above are not correct"
+            , "\n edit the file and add the form to 'doNotReplace'."]
+    -- true - changed 
+    when debug $ putIOwords ["procText done,   changed: ",  showT changed]
+
+    return changed
+
+    -- if debug 
+    --     then write8 fn textlinesNewFile res
+    --     else do 
+    --         renameToBak8 fn textLineType 
+    --         write8 fn textLineType res 
+
diff --git a/src/Lib/ProcTxt.hs b/src/Lib/ProcTxt.hs
new file mode 100644
--- /dev/null
+++ b/src/Lib/ProcTxt.hs
@@ -0,0 +1,55 @@
+-----------------------------------------------------------------------------
+-- Module      :   Convert umlaut written as ae, oe or ue into ä, ö and ü
+--              in a txt file
+-----------------------------------------------------------------------------
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.ProcTxt  -- (openMain, htf_thisModuelsTests)
+                   where
+-- import Uniform.Strings
+-- import Uniform.TypedFile
+-- import           Uniform.FileIO
+-- import Uniform.Error
+import           Lib.ProcWord
+import UniformBase
+import Lib.FileHandling
+import Control.Monad.Trans.Writer.Strict
+
+procTxt :: Bool -> [Text] -> Path Abs File -> ErrIO Bool
+-- ^ replace umlaut unless it is an permitted group
+-- in a file with extension txt
+procTxt debug erl2 fn = do
+    when debug $ putIOwords ["procTxt start", showT fn]
+    -- erl2         <- readErlaubt fnErl
+    -- erl  <- read6 fnErl txtFile -- reads lines
+    -- let erlaubt = concat . map words' $ erl :: [Text]
+
+    ls :: [Text] <- read8 fn textlinesFile
+
+    -- let ls2 = map (procLine2 erl2) ls
+    let (ls2,report) = runWriter $ mapM (procLine2Rep erl2) ls
+    let changed = zero /= trim' report
+    -- let res = False -- reports change - todo
+
+    -- newfn <- changeExtensionBakOrNew debug fn
+    writeWithBak debug fn textlinesFile ls2 
+    return changed
+
+    -- rest is copied
+    -- if debug
+    --     then do
+    --     let fnnew = makeAbsFile (toFilePath fn <> "NEW")
+    --     putIOwords ["procMd result in new", showT fnnew]
+    --     write8 fnnew textlinesFile res
+    --     putIOwords ["procMd result in new written", showT res, "fn", showT fnnew]
+    --     else do
+    --     let fnrename = fn <.> bakExtension :: Path Abs File
+    --     renameOneFile (fn <.> txtExtension) fnrename
+    --     putIOwords ["procMd renamed to bak", showT fnrename]
+    -- write8 fn textlinesFile ls2
diff --git a/src/Lib/ProcWord.hs b/src/Lib/ProcWord.hs
new file mode 100644
--- /dev/null
+++ b/src/Lib/ProcWord.hs
@@ -0,0 +1,118 @@
+-----------------------------------------------------------------------------
+-- Module      :   Convert umlaut written as ae, oe or ue into ä, ö and ü
+--              deals with lines, preserving the leading spaces and tabs.
+-- could be improved to use span to break on first non-space character
+-----------------------------------------------------------------------------
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.ProcWord  -- (openMain, htf_thisModuelsTests)
+                    where
+-- import           Uniform.Strings
+-- import           Uniform.FileIO
+import UniformBase
+-- import Lib.FileHandling
+import qualified Data.Text   as T (commonPrefixes)
+-- import Control.Monad
+import Control.Monad.Trans.Writer.Strict
+ 
+
+
+-- procTxt2 :: [Text] ->  Text -> Text  -- called from OneMDfile, not from ProcTxt
+-- -- change all umlaut in text - yaml header and markdown text
+-- -- preserve leading blanks of line, or tabs, but not mixture of these
+-- procTxt2 erl2  = unlines' . map (procLine2 erl2) . lines' 
+
+
+procLine2 :: [Text] ->  Text -> Text
+-- process one line preserving spaces or tabs (but not a mix) at start
+-- improve to use span break on first non-space 
+-- assumes that text is not \n terminated!
+procLine2 erl2 t = ld <> (procLine erl2 t1) 
+    where
+        (ld, t1) = auxProcLine2 t
+        -- case mb1 t of
+        --         Nothing -> case mb2 t of 
+        --                         Nothing -> ("", t)
+        --                         Just (lead2, _, t02) -> (lead2,t02)
+        --         Just (lead, _, t0) ->  (lead,t0)
+        -- mb1 tx = T.commonPrefixes "                  " tx
+        -- mb2 ty = T.commonPrefixes "\t\t\t\t\t\t\t" ty
+
+auxProcLine2 :: Text -> (Text,Text)
+auxProcLine2 t =  case mb1 t of
+                Nothing -> case mb2 t of 
+                                Nothing -> ("", t)
+                                Just (lead2, _, t02) -> (lead2,t02)
+                Just (lead, _, t0) ->  (lead,t0)
+    where
+        mb1 tx = T.commonPrefixes "                  " tx
+        mb2 ty = T.commonPrefixes "\t\t\t\t\t\t\t" ty
+
+procLine2Rep :: [Text] -> Text -> Writer Text Text
+-- accumulates the changed woerds for checking
+procLine2Rep erl2 t = do 
+        t2 <- procLineRep erl2 t1
+        return $ ld <> t2
+    where (ld,t1) = auxProcLine2 t 
+
+
+
+procLine :: [Text] -> Text -> Text
+procLine erlaubt ln = unwords' . map (procWord2 erlaubt) . words' $ ln
+-- process all words in a line
+-- should be idempotent, as long as text is not n\ terminated
+
+procLineRep :: [Text] -> Text -> Writer Text Text 
+procLineRep erlaubt ln = do 
+    ln2rep <- mapM (procWord2Rep erlaubt) (words' ln)
+    return . unwords' $ ln2rep 
+
+procWord2 :: [Text] -> Text -> Text
+-- replace umlaut unless it is an permitted group
+procWord2 erlaubt word =
+  if checkErlaubt erlaubt word then word else procWord1 word
+
+procWord2Rep :: [Text] -> Text -> Writer Text Text 
+procWord2Rep erlaubt word = do
+    let word1 = procWord2 erlaubt word
+    if word1 == word 
+        then return word 
+        else do
+            tell  ((word1<>" ")::Text)
+            return word1 
+    
+
+
+procWord1 :: Text -> Text
+-- ^ convert the umlaut in a single word
+-- no test, no exclusions
+-- preserve capitalization
+procWord1 t =
+  replace' "AE" "Ä"
+    . replace' "OE" "Ö"
+    . replace' "UE" "Ü"
+    . replace' "Ae" "Ä"
+    . replace' "Oe" "Ö"
+    . replace' "Ue" "Ü"
+    . replace' "ae" "ä"
+    . replace' "oe" "ö"
+    . replace' "ue" "ü"
+    $ t
+
+erlaubt1 :: [Text]  -- erlaubte Gruppen - for test only
+erlaubt1 = map toLower' ["koef", "poet", "poes", "neue", "freue"] 
+
+checkErlaubt :: [Text] -> Text -> Bool
+-- ^ enthaelt das Wort eine erlaubte kombination
+checkErlaubt erlaubt word = any (\e -> isInfixOf' e . toLower' $ word) erlaubt
+
+checkErlaubt1 :: Text -> Bool 
+checkErlaubt1 = checkErlaubt erlaubt1
+-- mit fester Liste der erlaubten - for test
+
diff --git a/src/ReplaceUmlaut.hs b/src/ReplaceUmlaut.hs
new file mode 100644
--- /dev/null
+++ b/src/ReplaceUmlaut.hs
@@ -0,0 +1,94 @@
+-----------------------------------------------------------------------------
+--
+-- Module      : the main for calling replaceUmlaut functions
+--    with a switch for the txt and the filename
+-----------------------------------------------------------------------------
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+
+module ReplaceUmlaut  where      -- must have Main (main) or Main where
+
+import UniformBase
+-- import           Uniform.Convenience.StartApp
+import           Uniform.Filenames           --   ( makeExtension )
+-- import           Data.Semigroup                 ( (<>) )
+import           Options.Applicative.Builder
+import           Options.Applicative
+import           Lib.ProcTxt
+import Lib.OneMDfile
+-- import           Lib.ProcPandocDatei
+import Lib.FileHandling
+
+programName, progTitle :: Text
+programName = "Umlaut in md or txt file " :: Text
+progTitle =
+  "replace ae, oe, and ue to umlaut (except when in nichtUmlaute.txt)" :: Text
+
+-- to run add in .ghci -- tests/Testing.hs
+
+main :: IO ()
+main = do
+  startProg
+    programName
+    -- progTitle
+    (parseAndExecute
+      (unlinesT
+        [ "converts words in the file given where"
+        , "the umlaut is written as ae, oe and ue"
+        , "to regular umlaut, "
+        , "execpt when in file nichtUmlaute"
+        , "which is the list of words where ae, oe or ue must remain."
+        ]
+      )
+      "the file (with extension .txt or .md)"
+    )
+  return ()
+
+
+--- cmd line parsing
+data LitArgs = LitArgs { isTxt   :: Bool   -- ^ is this a txt file
+      , argfile  :: String -- ^ the filename absolute
+      } deriving (Show)
+
+cmdArgs :: Parser (LitArgs)
+cmdArgs =
+  LitArgs
+    <$> switch
+          (long "txt" <> short 't' <> help
+            "true if this is a txt file, txt or md extension is recognized"
+          )
+    <*> argument str
+                 (
+      --   long "filename" <>
+                  metavar "filename")
+
+parseAndExecute :: Text -> Text -> ErrIO ()
+parseAndExecute t1 t2 = do
+        args <- callIO $ execParser opts
+        putIOwords ["parseAndExecute LitArgs", showT args]
+        curr <- currentDir
+        -- let dir0 = makeAbsDir "/home/frank/additionalSpace/DataBig/LitOriginals"
+        let fn2     = argfile args :: FilePath
+        let fn = curr </> makeRelFile fn2 :: Path Abs File
+        let isText  = isTxt args :: Bool
+
+        let ext     = getExtension fn
+        let isText2 = isText || ext == (Extension "txt")
+        let debug   = False
+        let erlFn = makeAbsFile "/home/frank/Workspace8/replaceUmlaut/nichtUmlaute.txt"
+        erl2               <- readErlaubt erlFn
+        res <- if isText2 then procTxt debug erl2 fn else procMd1 debug erl2 fn
+        putIOwords ["parseAndExecute done. File was changed: ", showT res]
+        
+    where
+        opts = info (helper <*> cmdArgs)
+              (fullDesc <> (progDesc . t2s $ t1) <> (header . t2s $ t2))
+
+
+   
diff --git a/tests/Lib/FileHandling_test.hs b/tests/Lib/FileHandling_test.hs
new file mode 100644
--- /dev/null
+++ b/tests/Lib/FileHandling_test.hs
@@ -0,0 +1,57 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :   a test for HTF framework
+--              tests the corresponding Lib.NN.hs program
+-- insert {-@ HTF_TESTS @-} for each import
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.FileHandling_test  -- (openMain, htf_thisModuelsTests)
+     where
+
+
+import Test.Framework
+-- import Uniform.Strings
+-- import Uniform.Error 
+import Lib.FileHandling
+-- import Lib.ProcWord
+import Uniform.FileIO
+import UniformBase
+
+openMain :: IO ()
+openMain = do
+    return ()
+-- tests to only check that filenames are correct
+-- not that correct content
+
+fn1 = makeAbsFile 
+        "/home/frank/Workspace8/replaceUmlaut/testMarkdown1.md"
+fn1t = makeAbsFile "/home/frank/Workspace8/replaceUmlaut/testMarkdown1.mdNEW"
+fn1bak = makeAbsFile "/home/frank/Workspace8/replaceUmlaut/testMarkdown1.bak"
+-- show produces the "xx"
+test_1 = do -- fn1 muss existieren
+                -- result fn1 renamed, new fn1 written 
+    r <- runErr $ 
+            do  -- necessary to keep the files for tests
+                cont :: [Text] <- read8 fn1 mdFile
+                writeWithBak True fn1 mdFile cont
+                doesFileExist' fn1t
+                -- return ()
+    assertEqual (Right True) r 
+
+test_2 = do   -- filename does not change but bak is written 
+    r <- runErr $ 
+            do 
+                cont :: [Text] <- read8 fn1 mdFile
+                writeWithBak False fn1 mdFile cont
+                doesFileExist' fn1bak
+    assertEqual (Right True) r 
+
diff --git a/tests/Lib/OneMDfile_test.hs b/tests/Lib/OneMDfile_test.hs
new file mode 100644
--- /dev/null
+++ b/tests/Lib/OneMDfile_test.hs
@@ -0,0 +1,97 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :   a test for HTF framework
+--              tests the corresponding Lib.NN.hs program
+-- insert {-@ HTF_TESTS @-} for each import
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.OneMDfile_test  -- (openMain, htf_thisModuelsTests)
+     where
+
+
+import Test.Framework
+-- import Uniform.Strings
+-- import Uniform.Error 
+import Lib.OneMDfile
+import Lib.ProcTxt
+import Lib.ProcWord
+import Lib.FileHandling
+-- import Uniform.FileIO
+import UniformBase
+
+-- show produces the "xx"
+test_a1 = assertEqual ("a") $ unwords' . words' $ ("a"::Text) 
+test_1 = assertEqual ("für") $ procLine2 [] ("fuer"::Text)
+-- not clear where the \n disappeared 
+-- test_2 = assertEqual 6 9
+test_2 = assertEqual ("       für") $ procLine2 [] ("       fuer"::Text)
+test_3 = assertEqual ("\tfür") $ procLine2 [] ("\tfuer"::Text)
+test_4 = assertEqual ("        Einschr\228nkungen gelebt.") $ procLine2 [] ("        Einschraenkungen gelebt."::Text)
+
+
+exampleText1 = unlines' [
+        "abstract: Was hat einer in der Katastrophe erlebt, der weniger unter den Folgen zu"
+        , "         leiden hatte, als andere? Wir haben meist ausserhalb von Wien am Land ohne wesentlichen"
+        , "     Einschraenkungen gelebt." ] :: Text
+resultText1 = unlines' [
+        "abstract: Was hat einer in der Katastrophe erlebt, der weniger unter den Folgen zu"
+        , "         leiden hatte, als andere? Wir haben meist ausserhalb von Wien am Land ohne wesentlichen"
+        , "     Einschränkungen gelebt." ] :: Text
+
+procLines1 :: [Text] -> Text -> Text
+procLines1 e t = unlines' . fmap   (procLine2 e) . lines' $ t
+test_5 = assertEqual resultText1 $ procLines1 [] exampleText1
+-- test_6 = assertEqual "" $ showT  exampleText1
+test_7 = assertEqual ("        Einschr\228nkungen gelebt.\n    und\n") $ procLines1 [] ("        Einschraenkungen gelebt.\n    und"::Text)
+
+
+test_m1 = do
+    r <- runErr $ do
+        let fn1 = makeRelFile "testData/test4.md"
+            fnerl = makeRelFile "nichtUmlaute" :: Path Rel File
+        cdir <- currentDir
+        let fnabs    = cdir </> fn1 :: Path Abs File
+        let fnerlabs = cdir </> fnerl :: Path Abs File
+        erl2 <- readErlaubt fnerlabs
+        procMd1 True erl2 fnabs
+    assertEqual (Right True) r
+
+-- test a simple md file 
+-- test_5 = do -- fn1 muss existieren
+--                 -- result fn1 renamed, new fn1 written 
+--     r <- runErr $ 
+--             do  -- necessary to keep the files for tests
+--                 cont :: Text <- readFile2 fn1 
+--                 fn2 <- changeExtensionBakOrNew True fn1 
+--                 writeFile2 fn2 cont
+--                 return (toFilePath fn2)
+--     assertEqual (Right fn1t) r 
+    
+    -- test_2 = assertEqual 6 9
+
+-- test_2 = assertEqual t2 $ map procWord1 t1
+-- t1 = ["fuer", "Moerder", "Aerger", "koennen", "maesten", "FUER", "Oesterreich"] :: [Text]
+-- t2 = ["für", "Mörder", "Ärger", "können", "mästen", "FÜR", "Österreich"] :: [Text]
+
+-- test_e1 = assertEqual [True, True]  $ map checkErlaubt1 e1
+-- e1 = ["Koeffizient", "Poetik"]::[Text]
+
+-- test_e2 = assertEqual True $ isInfixOf' ("poes"::Text) "poesie"
+-- test_w1 = assertEqual w1r $ map (procWord2 erlaubt1) w1
+-- w1 = ["fuer", "Moerder", "Aerger", "koennen", "maesten", "FUER"
+--   , "Koeffizienten", "Poetik", "Poet", "Poesie"] :: [Text]
+-- w1r = ["f\252r", "M\246rder", "\196rger", "k\246nnen", "m\228sten",
+--  "F\220R", "Koeffizienten", "Poetik", "Poet", "Poesie"]::[Text]
+
+-- w2 = unwords' w1 :: Text 
+-- w2r = "f\252r M\246rder \196rger k\246nnen m\228sten F\220R Koeffizienten Poetik Poet Poesie"
+-- test_idempot = assertEqual w2r (procLine erlaubt1 (procLine erlaubt1 w2))
diff --git a/tests/Lib/ProcText_test.hs b/tests/Lib/ProcText_test.hs
new file mode 100644
--- /dev/null
+++ b/tests/Lib/ProcText_test.hs
@@ -0,0 +1,68 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :   a test for HTF framework
+--              tests the corresponding Lib.NN.hs program
+-- insert {-@ HTF_TESTS @-} for each import
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.ProcText_test  -- (openMain, htf_thisModuelsTests)
+                        where
+
+
+import           Test.Framework
+-- import Uniform.Strings
+-- import           Uniform.Error
+import           Lib.ProcTxt
+-- import           Lib.ProcWord                   ( erlaubt1 )
+-- import           Uniform.FileIO
+import UniformBase
+import Lib.FileHandling
+import Lib.ProcTextFile
+-- test_1 = do
+--   r <- runErr $ do
+--     let fn = makeRelFile "testDaten" :: Path Rel File
+--     cdir <- currentDir
+--     let fnabs = cdir </> fn :: Path Abs File
+--     procTxt erlaubt1 fnabs
+--   assertEqual (Right ()) r
+
+ 
+-- dictionary = "/home/frank/Workspace8/replaceUmlaut/de.dic"
+testfn :: Path Abs File
+testfn = makeAbsFile "/home/frank/Workspace11/replaceUmlaut/testData/corona.txt"
+
+ 
+
+ 
+test_ohneErlaubt :: IO ()
+-- ohne erlaubte
+test_ohneErlaubt = do
+    r <- runErr $ do
+        let fn1 = makeRelFile "testData/test4.md"
+        cdir <- currentDir
+        let fnabs    = cdir </> fn1 :: Path Abs File
+        procTextFile True [] fnabs
+    assertEqual (Right True) r
+
+test_mitErlaubt :: IO ()
+-- mit erluabten 
+test_mitErlaubt = do
+    r <- runErr $ do
+        let fn1 = makeRelFile "testData/test4.md"
+            fnerl = makeRelFile "nichtUmlaute" :: Path Rel File
+        cdir <- currentDir
+        let fnabs    = cdir </> fn1 :: Path Abs File
+        let fnerlabs = cdir </> fnerl :: Path Abs File
+        erl2 <- readErlaubt fnerlabs
+        procTextFile True erl2 fnabs
+    assertEqual (Right True) r
+
diff --git a/tests/Lib/ProcTxt_test.hs b/tests/Lib/ProcTxt_test.hs
new file mode 100644
--- /dev/null
+++ b/tests/Lib/ProcTxt_test.hs
@@ -0,0 +1,81 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :   a test for HTF framework
+--              tests the corresponding Lib.NN.hs program
+-- insert {-@ HTF_TESTS @-} for each import
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.ProcTxt_test  -- (openMain, htf_thisModuelsTests)
+                        where
+
+
+import           Test.Framework
+-- import Uniform.Strings
+-- import           Uniform.Error
+import           Lib.ProcTxt
+-- import           Lib.ProcWord                   ( erlaubt1 )
+-- import           Uniform.FileIO
+import UniformBase
+import Lib.FileHandling
+
+-- test_1 = do
+--   r <- runErr $ do
+--     let fn = makeRelFile "testDaten" :: Path Rel File
+--     cdir <- currentDir
+--     let fnabs = cdir </> fn :: Path Abs File
+--     procTxt erlaubt1 fnabs
+--   assertEqual (Right ()) r
+
+test_2 :: IO ()
+test_2 = do
+  r <- runErr $ do
+    let fn    = makeRelFile "testData/corona.txt" :: Path Rel File
+    let fnerl = makeRelFile "nichtUmlaute" :: Path Rel File
+    cdir <- currentDir
+    let fnabs    = cdir </> fn :: Path Abs File
+    let fnerlabs = cdir </> fnerl :: Path Abs File
+    erl2 <- readErlaubt fnerlabs
+    procTxt True erl2 fnabs
+  assertEqual (Right True) r
+
+-- dictionary = "/home/frank/Workspace8/replaceUmlaut/de.dic"
+testfn :: Path Abs File
+testfn = makeAbsFile "/home/frank/Workspace11/replaceUmlaut/testData/corona.txt"
+
+test_3 :: IO ()
+test_3 = do
+  r <- runErr $ do
+            -- let fn = makeRelFile "testDaten" :: Path Rel File
+            -- let fnerl = makeRelFile "nichtUmlaute"::Path Rel File
+    cdir <- currentDir
+    -- let fnabs = cdir </> fn :: Path Abs File -- t
+    let fnabs    = testfn :: Path Abs File
+    let fnerl    = makeRelFile "nichtUmlaute" :: Path Rel File
+    let fnerlabs = cdir </> fnerl :: Path Abs File
+    erl2 <- readErlaubt fnerlabs
+    procTxt True erl2 fnabs
+  assertEqual (Right True) r
+
+
+ 
+-- test_m1 = do
+--     r <- runErr $ do
+--         let fn1 = makeRelFile "testData/test4.md"
+--         --     fnerl = makeRelFile "nichtUmlaute" :: Path Rel File
+--         cdir <- currentDir
+--         let fnabs    = cdir </> fn1 :: Path Abs File
+--         let fnerlabs = cdir </> fnerl :: Path Abs File
+--         erl2 <- readErlaubt fnerlabs
+--         procTxt True erl2 fnabs
+--     assertEqual (Right False) r
+
+ 
diff --git a/tests/Lib/ProcWord_test.hs b/tests/Lib/ProcWord_test.hs
new file mode 100644
--- /dev/null
+++ b/tests/Lib/ProcWord_test.hs
@@ -0,0 +1,95 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :   a test for HTF framework
+--              tests the corresponding Lib.NN.hs program
+-- insert {-@ HTF_TESTS @-} for each import
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+
+{-# LANGUAGE FlexibleContexts      #-}
+{-# LANGUAGE FlexibleInstances     #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE ScopedTypeVariables   #-}
+{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE TypeSynonymInstances  #-}
+{-# LANGUAGE OverloadedStrings     #-}
+
+module Lib.ProcWord_test  -- (openMain, htf_thisModuelsTests)
+     where
+
+
+import Test.Framework
+-- import Uniform.Strings
+import UniformBase
+import Lib.ProcWord
+import Control.Monad.Trans.Writer.Strict
+
+openMain :: IO ()
+openMain = do
+    return ()
+
+
+
+-- show produces the "xx"
+test_1 = assertEqual ("für") $ procWord1 ("fuer"::Text)
+-- test_2 = assertEqual 6 9
+
+test_2 = assertEqual t2 $ map procWord1 t1
+t1 = ["nichts", "fuer", "Moerder", "Aerger", "koennen", "maesten", "FUER", "Oesterreich"] :: [Text]
+t2 = ["nichts", "für", "Mörder", "Ärger", "können", "mästen", "FÜR", "Österreich"] :: [Text]
+
+test_e1 = assertEqual [True, True]  $ map checkErlaubt1 e1
+e1 = ["Koeffizient", "Poetik"]::[Text]
+
+test_e2 = assertEqual True $ isInfixOf' ("poes"::Text) "poesie"
+test_w1 = assertEqual w1r $ map (procWord2 erlaubt1) w1
+w1 = ["nichts", "fuer", "Moerder", "Aerger", "koennen", "maesten", "FUER"
+  , "Koeffizienten", "Poetik", "Poet", "Poesie"] :: [Text]
+w1r = ["nichts", "f\252r", "M\246rder", "\196rger", "k\246nnen", "m\228sten",
+ "F\220R", "Koeffizienten", "Poetik", "Poet", "Poesie"]::[Text]
+
+test_t1 = assertEqual t2 $ map (procWord2 []) t1
+
+-- test reporting
+-- the file do  not change if debug is set to true
+test_r1:: IO ()
+test_r1 =  do
+  r <- runErr $ do
+  
+        let t2exec = execWriter $ mapM (procWord2Rep []) ( t1) 
+        putIOwords ["test r1: t2exec",  t2exec]
+        return ((""::Text ) /= t2exec)  -- true ->  changed
+  assertEqual (Right True) r
+
+-- test result changed
+test_p1:: IO ()
+test_p1 =  do
+  r <- runErr $ do
+  
+        let (te,re) = runWriter $ mapM (procWord2Rep []) ( t1) 
+        putIOwords ["test p1: t1",  unwords' t1]
+        putIOwords ["test p1: te",  unwords' te]
+        putIOwords ["test p1: re",  re]
+        return ( t1 /= te)  -- true -  changed
+  assertEqual (Right True) r
+  
+test_r2:: IO ()
+test_r2 =  do
+  r <- runErr $ do
+  
+        let t2 = execWriter $ procLine2Rep [] (unwords' t1) 
+        putIOwords ["test r2: t2",  t2]
+        return ((""::Text ) /= t2)  -- true -  changed
+  assertEqual (Right True) r
+
+  
+test_p2:: IO ()
+test_p2 =  do
+  r <- runErr $ do
+  
+        let (te,re) = runWriter $ procLine2Rep [] (unwords' t1) 
+        putIOwords ["test p2: t1",  unwords' t1]
+        putIOwords ["test p2: te",  te]
+        putIOwords ["test p2: re",  re]
+        return (unwords' t1 /= te)  -- true - changed
+  assertEqual (Right True) r
diff --git a/tests/Testing.hs b/tests/Testing.hs
new file mode 100644
--- /dev/null
+++ b/tests/Testing.hs
@@ -0,0 +1,43 @@
+-----------------------------------------------------------------------------
+--
+-- Module      :   a test for HTF framework
+-- insert {-@ HTF_TESTS @-} for each import
+-----------------------------------------------------------------------------
+{-# OPTIONS_GHC -F -pgmF htfpp #-}
+
+module Main     where      -- must have Main (main) or Main where
+
+
+-- import System.Exit
+-- import Uniform.FileIO
+import UniformBase
+-- import Lib.ProcPandocDatei
+
+import           Test.Framework
+import {-@ HTF_TESTS @-} Lib.ProcWord_test
+import {-@ HTF_TESTS @-} Lib.ProcTxt_test
+import {-@ HTF_TESTS @-} Lib.OneMDfile_test
+import {-@ HTF_TESTS @-} Lib.ProcText_test
+-- import {-@ HTF_TESTS @-} Lib.FileHandling_test
+
+main :: IO ()
+main =  main1
+
+main1 :: IO ()
+main1 = do  -- with tests in other modules
+    putStrLn "HTF ExampleTest.hs:\n"
+    p <- htfMain htf_importedTests
+    putStrLn ("HTF end StringConversion.hs test:\n"
+         ++ show p)
+    return ()
+
+-- main2 :: IO ()
+-- main2 = do
+--  putStrLn "main2 start -----------"
+--  let erlfn = makeAbsFile "/home/frank/Workspace8/replaceUmlaut/nichtUmlaute.txt"
+--  let testfn = makeAbsFile "/home/frank/Workspace8/replaceUmlaut/testMarkdown0.md"
+--  res <- runErr $  procMd2 True erlfn testfn
+--  putStrLn (show res)
+--  putStrLn "main2 end ............."
+
+-- test_2 = assertEqual 6 9
