diff --git a/tests/library/iter-tree-explorer-test.cpp b/tests/library/iter-tree-explorer-test.cpp
index d12cf70d5..f58fffe8c 100644
--- a/tests/library/iter-tree-explorer-test.cpp
+++ b/tests/library/iter-tree-explorer-test.cpp
@@ -876,8 +876,66 @@ namespace test{
                 {
                   return new VerySpecivicIter{*wrappedIter() - 1};
                 }
+              
+              uint
+              currentVal()  const
+                {
+                  return *wrappedIter();
+                }
             };
-          UNIMPLEMENTED ("directly wrap and handle IterSource sub-interfaces");
+          
+          
+          VerySpecivicIter vsit{5};
+
+#if false /////////////////////////////////////////////////////////////////////////////////////////////////////////////UNIMPLEMENTED :: TICKET #888
+          auto ii = treeExplore(vsit);
+          
+          CHECK (not isnil (ii));
+          CHECK (5 == *ii);
+          ++ii;
+          CHECK (4 == *ii);
+          CHECK (4 == vsit.currentVal());
+          
+          VerySpecivicIter* clone = new VerySpecivicIter(vsit);
+          
+          CHECK (4 == clone->currentVal());
+          
+          cout << materialise(
+                    treeExplore(clone)
+                    
+                  ) <<endl;
+          
+          CHECK (4 == vsit.currentVal());
+          CHECK (4 == *ii);
+          ++ii;
+          CHECK (3 == *ii);
+          
+          auto jj = ii.explore([](PrivateSource& source){ return source.expandChildren(); });
+          
+          CHECK (3 == *jj);
+          CHECK (3 == vsit.currentVal());
+          
+          CHECK (0 == jj.depth());
+          jj.expandChildren();
+          CHECK (1 == jj.depth());
+          
+          CHECK (2 == *jj);
+          ++jj;
+          CHECK (1 == *jj);
+          
+          CHECK (2 == vsit.currentVal());
+          CHECK (1 == jj.depth());
+          ++jj;
+          CHECK (0 == jj.depth());
+          CHECK (2 == *jj);
+          CHECK (2 == vsit.currentVal());
+          ++jj;
+          CHECK (1 == *jj);
+          CHECK (1 == vsit.currentVal());
+          ++jj;
+          CHECK (isnil (jj));
+          CHECK (0 == vsit.currentVal());
+#endif    /////////////////////////////////////////////////////////////////////////////////////////////////////////////UNIMPLEMENTED :: TICKET #888
         }
       
       
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index bf5984bdb..02e7729b2 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -5892,7 +5892,7 @@
 </node>
 </node>
 </node>
-<node COLOR="#338800" CREATED="1512363286920" FOLDED="true" ID="ID_1420123769" MODIFIED="1513473558354" TEXT="Zusammenspiel">
+<node COLOR="#338800" CREATED="1512363286920" ID="ID_1420123769" MODIFIED="1513990796074" TEXT="Zusammenspiel">
 <icon BUILTIN="button_ok"/>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1512844805995" ID="ID_927486947" MODIFIED="1512927037825" TEXT="single-val">
 <icon BUILTIN="help"/>
@@ -6364,6 +6364,19 @@
 </node>
 </node>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513990803915" ID="ID_292438102" MODIFIED="1513990973201" TEXT="IterSource-Integration">
+<linktarget COLOR="#659fa4" DESTINATION="ID_292438102" ENDARROW="Default" ENDINCLINATION="853;414;" ID="Arrow_ID_1802135668" SOURCE="ID_1529167083" STARTARROW="None" STARTINCLINATION="674;0;"/>
+<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513990840253" ID="ID_923982542" MODIFIED="1513990864970" TEXT="wrapper analog zu WrappedLumieraIter">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513990851580" ID="ID_1445466432" MODIFIED="1513990865914" TEXT="Traits erweitern">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513990858787" ID="ID_1444097417" MODIFIED="1513990866482" TEXT="Funktor erweitern">
+<icon BUILTIN="flag-yellow"/>
+</node>
+</node>
 </node>
 <node COLOR="#338800" CREATED="1511837384749" FOLDED="true" ID="ID_274979743" MODIFIED="1513473563423" TEXT="asIterSource">
 <icon BUILTIN="button_ok"/>
@@ -6736,7 +6749,7 @@
 </node>
 </node>
 </node>
-<node COLOR="#338800" CREATED="1510941467586" FOLDED="true" ID="ID_381928532" MODIFIED="1513476987120" TEXT="TreeExplorer_test">
+<node COLOR="#338800" CREATED="1510941467586" ID="ID_381928532" MODIFIED="1513990811649" TEXT="TreeExplorer_test">
 <icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1510969031378" ID="ID_1678287752" MODIFIED="1512927037810" TEXT="verify_wrappedIterator();">
 <icon BUILTIN="button_ok"/>
@@ -7052,6 +7065,15 @@
 <node CREATED="1512789946314" ID="ID_1425696979" MODIFIED="1512789953964" TEXT="widerspricht dem Iteratoren-Konzept"/>
 </node>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513990814361" ID="ID_306902168" MODIFIED="1513990821537" TEXT="verify_IterSource()">
+<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513990873545" ID="ID_1789456983" MODIFIED="1513990887336" TEXT="einfache Iteration">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513990880600" ID="ID_1730629901" MODIFIED="1513990886456" TEXT="Iteration + Expansion">
+<icon BUILTIN="flag-yellow"/>
+</node>
+</node>
 <node COLOR="#338800" CREATED="1510969031379" ID="ID_1327871737" MODIFIED="1512952095270" TEXT="verify_depthFirstExploration();">
 <icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1512844598906" ID="ID_933777340" MODIFIED="1512861473722" TEXT="expand incl Parent">
@@ -8059,8 +8081,8 @@
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513962712192" ID="ID_357363842" MODIFIED="1513978505393" TEXT="festlegen, wo die VTable ist">
-<icon BUILTIN="pencil"/>
+<node COLOR="#338800" CREATED="1513962712192" ID="ID_357363842" MODIFIED="1513992370526" TEXT="festlegen, wo die VTable ist">
+<icon BUILTIN="button_ok"/>
 <node CREATED="1513978430367" ID="ID_616991569" MODIFIED="1513978446605" TEXT="Nav und Iter">
 <icon BUILTIN="yes"/>
 </node>
@@ -8068,8 +8090,8 @@
 <icon BUILTIN="info"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513986023498" ID="ID_1413967372" MODIFIED="1513986029842" TEXT="Integration mit TreeExplorer">
-<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513986023498" ID="ID_1413967372" MODIFIED="1513992377089" TEXT="Integration mit TreeExplorer">
+<icon BUILTIN="pencil"/>
 <node CREATED="1513986032290" ID="ID_1427647343" MODIFIED="1513986048710" TEXT="Problem: Zugang zur IterSource">
 <icon BUILTIN="messagebox_warning"/>
 <node CREATED="1513986054199" ID="ID_1239076586" MODIFIED="1513986063345" TEXT="bisher: protected im IterSource::iterator"/>
@@ -8096,13 +8118,22 @@
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513988744665" HGAP="27" ID="ID_1242119956" MODIFIED="1513989064956" TEXT="vorl&#xe4;ufige IterSource-Integration" VSHIFT="12">
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513988744665" HGAP="27" ID="ID_1242119956" MODIFIED="1513992382452" TEXT="vorl&#xe4;ufige IterSource-Integration" VSHIFT="12">
 <linktarget COLOR="#1f9aa8" DESTINATION="ID_1242119956" ENDARROW="Default" ENDINCLINATION="87;-111;" ID="Arrow_ID_662359263" SOURCE="ID_1398933111" STARTARROW="None" STARTINCLINATION="-259;16;"/>
+<icon BUILTIN="pencil"/>
+<node CREATED="1513988930537" ID="ID_594152265" MODIFIED="1513992353318" TEXT="kann selbst&#xe4;ndig Iterator-Front-End bauen">
+<icon BUILTIN="yes"/>
+</node>
+<node CREATED="1513988952901" ID="ID_1668656742" MODIFIED="1513992356071" TEXT="dieses Front-End hat Zugang zum konkreten Sub-Interface">
+<icon BUILTIN="yes"/>
+</node>
+<node CREATED="1513988974179" ID="ID_900695722" MODIFIED="1513992358833" TEXT="Funktoren k&#xf6;nnen dieses Sub-Interface akzeptieren und liefern">
+<icon BUILTIN="yes"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513989030587" ID="ID_1529167083" MODIFIED="1513990973201" TEXT="TreeExplorer &#xfc;bernimmt / wrappt / packt aus">
+<arrowlink COLOR="#659fa4" DESTINATION="ID_292438102" ENDARROW="Default" ENDINCLINATION="853;414;" ID="Arrow_ID_1802135668" STARTARROW="None" STARTINCLINATION="674;0;"/>
 <icon BUILTIN="flag-yellow"/>
-<node CREATED="1513988930537" ID="ID_594152265" MODIFIED="1513988942954" TEXT="kann selbst&#xe4;ndig Iterator-Front-End bauen"/>
-<node CREATED="1513988952901" ID="ID_1668656742" MODIFIED="1513988971647" TEXT="dieses Front-End hat Zugang zum konkreten Sub-Interface"/>
-<node CREATED="1513988974179" ID="ID_900695722" MODIFIED="1513989005434" TEXT="Funktoren k&#xf6;nnen dieses Sub-Interface akzeptieren und liefern"/>
-<node CREATED="1513989030587" ID="ID_1529167083" MODIFIED="1513989044189" TEXT="TreeExplorer &#xfc;bernimmt / wrappt / packt aus"/>
+</node>
 </node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513962765760" ID="ID_795911284" MODIFIED="1513963084358" TEXT="Demo-Impl mit GenNode-Tree">