diff --git a/src/lib/diff/diff-language.hpp b/src/lib/diff/diff-language.hpp
index 511108389..724856472 100644
--- a/src/lib/diff/diff-language.hpp
+++ b/src/lib/diff/diff-language.hpp
@@ -270,6 +270,8 @@ namespace diff{
    *          target type `TAR` (1st template arg)
    * @warning the actual language remains unspecified;
    *          it is picked from the visible context.
+   * @see tree-diff-application.hpp
+   * @see list-diff-application.hpp
    */
   template<class TAR, typename SEL =void>
   class DiffApplicationStrategy;
@@ -307,6 +309,7 @@ namespace diff{
           target_.initDiffApplication();
           for ( ; diff; ++diff )
             diff->applyTo(target_);
+          target_.completeDiffApplication();
         }
     };
   
diff --git a/src/lib/diff/list-diff-application.hpp b/src/lib/diff/list-diff-application.hpp
index a3bb04f38..15f3fc4dc 100644
--- a/src/lib/diff/list-diff-application.hpp
+++ b/src/lib/diff/list-diff-application.hpp
@@ -171,6 +171,17 @@ namespace diff{
           seq_.reserve (orig_.size() * 120 / 100);    // heuristics for storage pre-allocation
           pos_ = orig_.begin();
         }
+      
+      void
+      completeDiffApplication()
+        {
+          if (not end_of_target())
+            throw error::State(_Fmt("Not all source data consumed after diff application. "
+                                    "Element %s waiting to be consumed") % *pos_
+                              , LERR_(DIFF_STRUCTURE));
+          // discard storage
+          orig_.clear();
+        }
     };
   
   
diff --git a/src/lib/diff/tree-diff-application.hpp b/src/lib/diff/tree-diff-application.hpp
index 2c3b19741..976d6e8fa 100644
--- a/src/lib/diff/tree-diff-application.hpp
+++ b/src/lib/diff/tree-diff-application.hpp
@@ -271,6 +271,7 @@ namespace diff{
    * @throws  _unspecified errors_ when delegated operations fail.
    * @see TreeDiffInterpreter explanation of the verbs
    * @see DiffComplexApplication_test demonstration of usage
+   * @see [implementation of the binding functions](\ref tree-diff.cpp)
    */
   class TreeDiffMutatorBinding
     : public TreeDiffInterpreter
@@ -384,6 +385,18 @@ namespace diff{
           TreeDiffMutatorBinding::treeMutator_ = &scopes_.currentScope();
           REQUIRE (this->treeMutator_);
         }
+      
+      void
+      completeDiffApplication()
+        {
+          if (not treeMutator_->completeScope())
+            throw error::State(_Fmt("Unsettled content remains after diff application. "
+                                    "Top level == %s") % subject_
+                              , LERR_(DIFF_STRUCTURE));
+          // discard storage
+          treeMutator_ = nullptr;
+          scopes_.clear();
+        }
     };
   
   
diff --git a/src/lib/diff/tree-diff.cpp b/src/lib/diff/tree-diff.cpp
index 8c61b297f..c9fd23782 100644
--- a/src/lib/diff/tree-diff.cpp
+++ b/src/lib/diff/tree-diff.cpp
@@ -118,7 +118,7 @@ namespace diff{
       throw error::State(_Fmt("Diff application floundered in nested scope %s; "
                               "unexpected extra elements found when diff "
                               "should have settled everything.") % idi.getSym()
-                        , LUMIERA_ERROR_DIFF_CONFLICT);
+                        , LUMIERA_ERROR_DIFF_STRUCTURE);
   }
   
   void
@@ -127,7 +127,7 @@ namespace diff{
     if (0 == scopeManger_->depth())
       throw error::Fatal(_Fmt("Diff application floundered after leaving scope %s; "
                               "unbalanced nested scopes, diff attempts to pop root.") % idi.getSym()
-                        , LUMIERA_ERROR_DIFF_CONFLICT);
+                        , LUMIERA_ERROR_DIFF_STRUCTURE);
   }
   
   
diff --git a/src/lib/diff/tree-mutator.hpp b/src/lib/diff/tree-mutator.hpp
index 7d50a5cd0..ff85cf34b 100644
--- a/src/lib/diff/tree-mutator.hpp
+++ b/src/lib/diff/tree-mutator.hpp
@@ -84,6 +84,7 @@
  ** @see tree-mutator-test.cpp
  ** @see tree-mutator-binding-test.cpp
  ** @see [usage for tree diff application](\ref tree-diff-application.hpp)
+ **      especially `DiffApplicationStrategy<TAR,  enable_if<TreeDiffTraits<TAR>>>` defined there 
  ** @see diff-language.hpp
  ** @see DiffDetector
  ** 
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index be4c54ca3..d6ab7ba1a 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -36283,12 +36283,38 @@
 </node>
 </node>
 </node>
+<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1576416522053" ID="ID_910911447" MODIFIED="1576416574835" TEXT="listener wird nicht getriggert">
+<linktarget COLOR="#e03f68" DESTINATION="ID_910911447" ENDARROW="Default" ENDINCLINATION="-217;7;" ID="Arrow_ID_929225071" SOURCE="ID_159550911" STARTARROW="None" STARTINCLINATION="-2;-97;"/>
+<icon BUILTIN="broken-line"/>
+<node CREATED="1576416597927" ID="ID_805984773" MODIFIED="1576416619356" TEXT="ctor vom top-Level nicht aufgerufen"/>
+<node CREATED="1576416620136" ID="ID_1598925580" MODIFIED="1576416632057" TEXT="denn der top-Level-TreeMutator lebt weiter"/>
+<node CREATED="1576416632790" ID="ID_141285194" MODIFIED="1576416640381" TEXT="...solange der DiffApplikator lebt"/>
+<node CREATED="1576416641269" ID="ID_605158809" MODIFIED="1576416645584" TEXT="ist das gut so?">
+<node CREATED="1576416647561" ID="ID_486491592" MODIFIED="1576416658877" TEXT="viele Tests verwenden den Applikator mehrfach"/>
+<node CREATED="1576416659587" ID="ID_791956106" MODIFIED="1576416715929" TEXT="nicht jedoch die produktive Verwendung in ctrl::Nexus::change (ID, MutationMessage&amp;&amp; diff)">
+<icon BUILTIN="forward"/>
+</node>
+<node CREATED="1576416749566" ID="ID_1371891888" MODIFIED="1576417191286" TEXT="das k&#xf6;nnte sp&#xe4;ter auch ein Ansatzpunkt f&#xfc;r Caching sein">
+<icon BUILTIN="button_cancel"/>
+</node>
+<node CREATED="1576417156080" ID="ID_1679161356" MODIFIED="1576417199243" TEXT="aber: jede neue Anwendung konstruiert einen neuen TreeMutator">
+<icon BUILTIN="idea"/>
+</node>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1576417208152" ID="ID_974220547" MODIFIED="1576417222583" TEXT="also braucht die Diff-Anwendung einen Abschlu&#xdf;">
+<icon BUILTIN="flag-yellow"/>
+</node>
+</node>
 </node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1576189140651" ID="ID_835328626" MODIFIED="1576360868184" TEXT="Test">
 <icon BUILTIN="pencil"/>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1576189161697" ID="ID_1786250967" MODIFIED="1576189178606" TEXT="Struktur&#xe4;nderungen triggern Listener">
 <icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1576416511260" ID="ID_159550911" MODIFIED="1576416585202" TEXT="tut noch nicht...">
+<arrowlink COLOR="#e03f68" DESTINATION="ID_910911447" ENDARROW="Default" ENDINCLINATION="-217;7;" ID="Arrow_ID_929225071" STARTARROW="None" STARTINCLINATION="-2;-97;"/>
+<icon BUILTIN="flag-yellow"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1576189172445" ID="ID_1803915875" MODIFIED="1576189177766" TEXT="andere &#xc4;nderungen triggern nicht">
 <icon BUILTIN="flag-yellow"/>