diff -r 31a43d94cc26 -r 715d6147ba3a include/Ottoman.h
--- a/include/Ottoman.h	Sun Sep 20 15:14:12 2009 -0700
+++ b/include/Ottoman.h	Thu Sep 24 10:36:08 2009 -0700
@@ -79,6 +79,10 @@
         bool scavenge (bool repair =false);
         
         ChunkIterator* chunkIterator() const;       // for testing purposes
+        
+    protected:
+        /** Hook for subclassers: Called when new versions are added. */
+        virtual void versionsChanged()                          { }
 
     private:
         Ottoman(const Ottoman&);            // forbid copying/assignment