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diff --git a/src/stlplus/persistence/persistent.hpp b/src/stlplus/persistence/persistent.hpp
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+++ b/src/stlplus/persistence/persistent.hpp
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+#ifndef STLPLUS_PERSISTENT
+#define STLPLUS_PERSISTENT
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+//   Interface class inherited by classes using the interface approach to polymorphism
+
+////////////////////////////////////////////////////////////////////////////////
+
+#include "persistence_fixes.hpp"
+#include "persistent_exceptions.hpp"
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace stlplus
+{
+
+  class dump_context;
+  class restore_context;
+
+  class persistent
+  {
+  public:
+    virtual void dump(dump_context&) const throw(persistent_dump_failed) = 0;
+    virtual void restore(restore_context&) throw(persistent_restore_failed) = 0;
+    virtual persistent* clone(void) const = 0;
+    virtual ~persistent(void) {}
+  };
+
+} // end namespace stlplus
+
+  ////////////////////////////////////////////////////////////////////////////////
+#endif