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diff --git a/src/engine/Stateful.hpp b/src/engine/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 3 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 more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Machina.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MACHINA_STATEFUL_HPP
+#define MACHINA_STATEFUL_HPP
+
+#include <stdint.h>
+
+#include "redlandmm/World.hpp"
+#include "redlandmm/Model.hpp"
+
+#include "machina/types.hpp"
+
+namespace Raul { class Atom; }
+
+namespace Machina {
+
+class URIs;
+
+class Stateful {
+public:
+	Stateful();
+
+	virtual ~Stateful() {}
+
+	virtual void set(URIInt key, const Raul::Atom& value) {}
+	virtual void write_state(Redland::Model& model) = 0;
+
+	uint64_t             id() const { return _id; }
+	const Redland::Node& rdf_id(Redland::World& world) const;
+
+	static uint64_t next_id() { return _next_id++; }
+
+protected:
+	Stateful(uint64_t id) : _id(id) {}
+
+private:
+	static uint64_t _next_id;
+
+	uint64_t              _id;
+	mutable Redland::Node _rdf_id;
+};
+
+class StatefulKey : public Stateful {
+public:
+	StatefulKey(uint64_t id) : Stateful(id) {}
+
+	void write_state(Redland::Model& model) {}
+};
+
+} // namespace Machina
+
+#endif // MACHINA_STATEFUL_HPP