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diff --git a/src/engine/machina/Stateful.hpp b/src/engine/machina/Stateful.hpp
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+++ b/src/engine/machina/Stateful.hpp
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+/* This file is part of Machina
+ * Copyright (C) 2007-2010 David Robillard <http://drobilla.net>
+ *
+ * Machina 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.
+ *
+ * Machina 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 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.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef MACHINA_STATEFUL_HPP
+#define MACHINA_STATEFUL_HPP
+
+#include "redlandmm/Model.hpp"
+
+namespace Machina {
+
+class Stateful {
+public:
+	virtual ~Stateful() {}
+
+	virtual void write_state(Redland::Model& model) = 0;
+
+	Redland::Node id() const                      { return _id; }
+	void          set_id(const Redland::Node& id) { _id = id; }
+
+protected:
+	Redland::Node _id;
+};
+
+} // namespace Machina
+
+#endif // MACHINA_STATEFUL_HPP