diff --git a/src/lib/sub-id.hpp b/src/lib/sub-id.hpp
new file mode 100644
index 000000000..8706a03aa
--- /dev/null
+++ b/src/lib/sub-id.hpp
@@ -0,0 +1,67 @@
+/*
+  SUB-ID.hpp  -  extensible symbolic identifier
+ 
+  Copyright (C)         Lumiera.org
+    2009,               Hermann Vosseler <Ichthyostega@web.de>
+ 
+  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 2 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, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ 
+*/
+
+
+/** @file sub-id.hpp
+ ** Extensible symbolic ID type. 
+ ** @todo (9/09) WIP-WIP-WIP just some vague emerging ideas here...
+ ** 
+ ** My observation is that, during design, I did run again and again into a specific
+ ** situation, which I then needed to circumvent due to a lacking primary solution.
+ ** Learning from that experiences, I start building this structured ID template.
+ ** - it shall be an \em symbolic identifier, not an artificial ID
+ ** - the basic value set should be limited and statically type safe.
+ ** - possibility of structured adornments and variations
+ ** - optionally concealing these extensions from the interface level
+ ** 
+ ** @see SubID_test
+ ** @see MultiFact
+ **
+ */
+
+
+
+#ifndef LIB_SUB_ID_H
+#define LIB_SUB_ID_H
+
+//#include <functional>
+
+
+namespace lib {
+  
+  
+  
+  
+  /**
+   * 
+   */
+  template<typename I>
+  struct SubID
+    {
+    };
+  
+  
+  
+  
+  
+} // namespace lib
+#endif
diff --git a/tests/40components.tests b/tests/40components.tests
index 0292330ab..1d6dacbf9 100644
--- a/tests/40components.tests
+++ b/tests/40components.tests
@@ -863,6 +863,11 @@ return: 0
 END
 
 
+PLANNED "extensible symbolic identifier" SubID_test <<END
+return: 0
+END
+
+
 TEST "VectorTransfer_test" VectorTransfer_test <<END
 return: 0
 END
diff --git a/tests/lib/Makefile.am b/tests/lib/Makefile.am
index d0fca1599..7362c6caf 100644
--- a/tests/lib/Makefile.am
+++ b/tests/lib/Makefile.am
@@ -87,6 +87,7 @@ test_lib_SOURCES =						\
 	$(testlib_srcdir)/test/test-helper-test.cpp		\
 	$(testlib_srcdir)/typed-allocation-manager-test.cpp	\
 	$(testlib_srcdir)/typed-counter-test.cpp		\
+	$(testlib_srcdir)/sub-id-test.cpp			\
 	$(testlib_srcdir)/vectortransfertest.cpp		\
 	$(testlib_srcdir)/visitingtoolconcept.cpp		\
 	$(testlib_srcdir)/visitingtoolextendedtest.cpp		\
diff --git a/tests/lib/sub-id-test.cpp b/tests/lib/sub-id-test.cpp
new file mode 100644
index 000000000..dfa99046c
--- /dev/null
+++ b/tests/lib/sub-id-test.cpp
@@ -0,0 +1,127 @@
+/*
+  SubID(Test)  -  exploring possible properties of an extensible symbolic identifier
+ 
+  Copyright (C)         Lumiera.org
+    2009,               Hermann Vosseler <Ichthyostega@web.de>
+ 
+  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 2 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, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ 
+* *****************************************************/
+
+
+#include "lib/test/run.hpp"
+
+#include "lib/sub-id.hpp"
+
+#include <boost/functional/hash.hpp>
+#include <tr1/unordered_map>
+#include <tr1/functional>
+#include <vector>
+#include <string>
+
+
+namespace lib {
+namespace test{
+  
+//  using std::tr1::function;
+  using std::tr1::bind;
+  using std::tr1::placeholders::_1;
+  using boost::hash;
+  using std::vector;
+  using std::string;
+  
+  
+  namespace { // test data
+  
+  }
+  
+  
+  
+  
+  /****************************************************************************
+   * @test for now (9/09) this is a playground for shaping a vague design idea
+   *       - base types and casts 
+   *       - exploring some extensions
+   *       - use this ID as Hash-Map key
+   *       
+   * @see lib::SubID
+   */
+  class SubID_test : public Test
+    {
+      
+      virtual void
+      run (Arg)
+        {
+          UNIMPLEMENTED ("SubID brainstorming");
+          
+          checkBaseType();
+          checkExtension();
+          
+//        buildHashtable<ID_A> (buildIDs<ID_A>() );
+//        buildHashtable<ID_B> (buildIDs<ID_B>() );
+        }
+      
+      
+      void
+      checkBaseType ()
+        {
+        }
+      
+      
+      void
+      checkExtension ()
+        {
+        }
+      
+      
+      template<class KEY>
+      struct HashTable
+        : std::tr1::unordered_map<KEY, string, hash<KEY> >
+        {
+          void
+          add (KEY key)
+            {
+              *this[key] = string(key);
+            }
+          
+          void
+          verify (KEY key)
+            {
+              ASSERT (string(key) == *this[key]);
+            }
+        };
+      
+      
+      template<class KEY>
+      void
+      buildHashtable (vector<KEY> keys)
+        {
+          
+          typedef HashTable<KEY> HTab;
+          HTab tab;
+          
+          for_each (keys, bind (&HTab::add,    tab, _1 ));
+          for_each (keys, bind (&HTab::verify, tab, _1 ));
+        }
+      
+      
+    };
+  
+  
+  /** Register this test class... */
+  LAUNCHER (SubID_test, "unit common");
+  
+  
+}} // namespace lib::test