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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 2007-2013 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 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 <set>
+
+#include "machina/types.hpp"
+
+#include "Action.hpp"
+#include "MIDISink.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 its
+ * 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);
+
+	bool operator==(const Node& rhs) const;
+
+	void set_enter_action(SPtr<Action> action);
+	void set_exit_action(SPtr<Action> action);
+
+	SPtr<const Action> enter_action() const { return _enter_action; }
+	SPtr<Action>       enter_action()       { return _enter_action; }
+	SPtr<const Action> exit_action()  const { return _exit_action; }
+	SPtr<Action>       exit_action()        { return _exit_action; }
+
+	void enter(MIDISink* sink, TimeStamp time);
+	void exit(MIDISink* sink, TimeStamp time);
+
+	void edges_changed();
+
+	void       add_edge(SPtr<Edge> edge);
+	void       remove_edge(SPtr<Edge> edge);
+	SPtr<Edge> remove_edge_to(SPtr<Node> node);
+	bool       connected_to(SPtr<Node> node);
+
+	void set(URIInt key, const Atom& value);
+	void write_state(Sord::Model& model);
+
+	bool         is_initial() const           { return _is_initial; }
+	bool         is_active() const            { return _is_active; }
+	TimeStamp    enter_time() const           { return _enter_time; }
+	TimeStamp    exit_time() const            { 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; }
+
+	struct EdgeHeadOrder {
+		inline bool operator()(const SPtr<const Edge>& a,
+		                       const SPtr<const Edge>& b) {
+			return a.get() < b.get();
+		}
+	};
+
+	SPtr<Edge> edge_to(SPtr<Node> head) const;
+
+	typedef std::set<SPtr<Edge>, EdgeHeadOrder> Edges;
+
+	Edges& edges() { return _edges; }
+
+	SPtr<Edge> random_edge();
+
+private:
+	Node& operator=(const Node& other); // undefined
+
+	TimeStamp    _enter_time;   ///< valid iff _is_active
+	TimeDuration _duration;
+	SPtr<Action> _enter_action;
+	SPtr<Action> _exit_action;
+	Edges        _edges;
+	Schrodinbit  _changed;
+	bool         _is_initial;
+	bool         _is_selector;
+	bool         _is_active;
+};
+
+} // namespace machina
+
+#endif // MACHINA_NODE_HPP