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diff --git a/src/engine/Node.hpp b/src/engine/Node.hpp
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+/* This file is part of Machina.
+ * Copyright (C) 2007-2009 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_NODE_HPP
+#define MACHINA_NODE_HPP
+
+#include "raul/List.hpp"
+#include "raul/MIDISink.hpp"
+#include "raul/SharedPtr.hpp"
+
+#include "Action.hpp"
+#include "Schrodinbit.hpp"
+#include "Stateful.hpp"
+
+namespace Machina {
+
+class Edge;
+using Raul::TimeDuration;
+using Raul::TimeStamp;
+using Raul::TimeUnit;
+
+
+/** A node is a state (as in a FSM diagram), or "note".
+ *
+ * It contains a action, as well as a duration and pointers to it's
+ * successors (states/nodes that (may) follow it).
+ *
+ * Initial nodes do not have enter actions (since they are entered at
+ * an undefined point in time <= 0).
+ */
+class Node : public Stateful {
+public:
+	Node(TimeDuration duration, bool initial=false);
+	Node(const Node& copy);
+
+	void set_enter_action(SharedPtr<Action> action);
+	void set_exit_action(SharedPtr<Action> action);
+
+	SharedPtr<Action> enter_action() { return _enter_action; }
+	SharedPtr<Action> exit_action()  { return _exit_action; }
+
+	void enter(SharedPtr<Raul::MIDISink> driver, TimeStamp time);
+	void exit(SharedPtr<Raul::MIDISink> driver, TimeStamp time);
+
+	void edges_changed();
+
+	void add_edge(SharedPtr<Edge> edge);
+	void remove_edge(SharedPtr<Edge> edge);
+	SharedPtr<Edge> remove_edge_to(SharedPtr<Node> node);
+	bool connected_to(SharedPtr<Node> node);
+
+	void set(URIInt key, const Raul::Atom& value);
+	void write_state(Redland::Model& model);
+
+	bool         is_initial() const           { return _is_initial; }
+	void         set_initial(bool i)          { _is_initial = i; }
+	bool         is_active() const            { return _is_active; }
+	TimeStamp    enter_time() const           { assert(_is_active); return _enter_time; }
+	TimeStamp    exit_time() const            { assert(_is_active); return _enter_time + _duration; }
+	TimeDuration duration() const             { return _duration; }
+	void         set_duration(TimeDuration d) { _duration = d; }
+	bool         is_selector() const          { return _is_selector; }
+	void         set_selector(bool i);
+
+	inline bool changed()     { return _changed; }
+	inline void set_changed() { _changed = true; }
+
+	typedef Raul::List<SharedPtr<Edge> > Edges;
+	Edges& edges() { return _edges; }
+
+	SharedPtr<Edge> random_edge();
+
+private:
+	Node& operator=(const Node& other); // undefined
+
+	TimeStamp         _enter_time; ///< valid iff _is_active
+	TimeDuration      _duration;
+	SharedPtr<Action> _enter_action;
+	SharedPtr<Action> _exit_action;
+	Edges             _edges;
+	Schrodinbit       _changed;
+	bool              _is_initial;
+	bool              _is_selector;
+	bool              _is_active;
+};
+
+
+} // namespace Machina
+
+#endif // MACHINA_NODE_HPP