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diff --git a/src/engine/Edge.hpp b/src/engine/Edge.hpp
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+++ b/src/engine/Edge.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_EDGE_HPP
+#define MACHINA_EDGE_HPP
+
+#include <list>
+
+#include "machina/types.hpp"
+
+#include "Action.hpp"
+#include "Stateful.hpp"
+
+namespace machina {
+
+class Node;
+
+class Edge : public Stateful
+{
+public:
+	Edge(WPtr<Node> tail, SPtr<Node> head, float probability=1.0f)
+		: _tail(tail)
+		, _head(head)
+		, _probability(probability)
+	{}
+
+	void set(URIInt key, const Atom& value);
+	void write_state(Sord::Model& model);
+
+	WPtr<Node> tail() { return _tail; }
+	SPtr<Node> head() { return _head; }
+
+	void set_tail(WPtr<Node> tail) { _tail = tail; }
+	void set_head(SPtr<Node> head) { _head = head; }
+
+	inline float probability() const      { return _probability; }
+	inline void  set_probability(float p) { _probability = p; }
+
+private:
+	WPtr<Node> _tail;
+	SPtr<Node> _head;
+	float      _probability;
+};
+
+} // namespace machina
+
+#endif // MACHINA_EDGE_HPP