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diff --git a/src/stlplus/persistence/persistent_interface.tpp b/src/stlplus/persistence/persistent_interface.tpp
deleted file mode 100644
index a684aa3..0000000
--- a/src/stlplus/persistence/persistent_interface.tpp
+++ /dev/null
@@ -1,99 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-
-//   Author:    Andy Rushton
-//   Copyright: (c) Southampton University 1999-2004
-//              (c) Andy Rushton           2004-2009
-//   License:   BSD License, see ../docs/license.html
-
-//   Polymorphous classes using the interface approach
-
-//   format: magic [ key data ]
-
-////////////////////////////////////////////////////////////////////////////////
-#include "persistent_int.hpp"
-
-namespace stlplus
-{
-
-  ////////////////////////////////////////////////////////////////////////////////
-
-  template<typename T>
-  void dump_interface(dump_context& context, const T* const data)
-    throw(persistent_dump_failed)
-  {
-    try
-    {
-      // register the address and get the magic key for it
-      std::pair<bool,unsigned> mapping = context.pointer_map(data);
-      dump_unsigned(context,mapping.second);
-      // if the address is null, then that is all that we need to do
-      // however, if it is non-null and this is the first sight of the address, dump the contents
-      if (data && !mapping.first)
-      {
-        // interface method
-        // the lookup just finds the magic key and the type has a dump method
-        // this will throw persistent_illegal_type if the type is not registered
-        unsigned key = context.lookup_interface(typeid(*data));
-        // dump the magic key for the type
-        dump_unsigned(context, key);
-        // now call the dump method defined by the interface
-        data->dump(context);
-      }
-    }
-    catch (const persistent_illegal_type& except)
-    {
-      // convert this to a simpler dump failed exception
-      throw persistent_dump_failed(except.what());
-    }
-  }
-
-  ////////////////////////////////////////////////////////////////////////////////
-
-  template<typename T>
-  void restore_interface(restore_context& context, T*& data)
-    throw(persistent_restore_failed)
-  {
-    try
-    {
-      // first delete any previous object pointed to since the restore creates the object of the right subclass
-      if (data)
-      {
-        delete data;
-        data = 0;
-      }
-      // get the magic key
-      unsigned magic = 0;
-      restore_unsigned(context,magic);
-      // now lookup the magic key to see if this pointer has already been restored
-      // null pointers are always flagged as already restored
-      std::pair<bool,void*> address = context.pointer_map(magic);
-      if (address.first)
-      {
-        // seen before, so simply map it to the existing address
-        data = (T*)address.second;
-      }
-      else
-      {
-        // now restore the magic key that denotes the particular subclass
-        unsigned key = 0;
-        restore_unsigned(context, key);
-        // interface approach
-        // first clone the sample object stored in the map - lookup_interface can throw persistent_illegal_type
-        data = (T*)(context.lookup_interface(key)->clone());
-        // add this pointer to the set of already seen objects
-        // do this before restoring the object so that self-referential structures restore correctly
-        context.pointer_add(magic,data);
-        // now restore the contents using the object's method
-        data->restore(context);
-      }
-    }
-    catch (const persistent_illegal_type& exception)
-    {
-      // convert this to a simpler dump failed exception
-      throw persistent_restore_failed(exception.what());
-    }
-  }
-
-  ////////////////////////////////////////////////////////////////////////////////
-
-} // end namespace stlplus