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diff --git a/ingen/Edge.hpp b/ingen/Edge.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2012 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or any later version.
+
+  Ingen 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_INTERFACE_EDGE_HPP
+#define INGEN_INTERFACE_EDGE_HPP
+
+namespace Raul { class Path; }
+
+namespace Ingen {
+
+/** A connection between two ports.
+ *
+ * \ingroup interface
+ */
+class Edge
+{
+public:
+	virtual ~Edge() {}
+
+	virtual const Raul::Path& tail_path() const = 0;
+	virtual const Raul::Path& head_path() const = 0;
+};
+
+} // namespace Ingen
+
+#endif // INGEN_INTERFACE_EDGE_HPP