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diff --git a/ingen/GraphObject.hpp b/ingen/GraphObject.hpp
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+/* This file is part of Ingen.
+ * Copyright 2007-2011 David Robillard <http://drobilla.net>
+ *
+ * Ingen 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 2 of the License, or (at your option) 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 General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef INGEN_INTERFACE_GRAPHOBJECT_HPP
+#define INGEN_INTERFACE_GRAPHOBJECT_HPP
+
+#include "raul/Deletable.hpp"
+
+#include "ingen/Resource.hpp"
+
+namespace Raul { class Atom; class Path; class Symbol; }
+
+namespace Ingen {
+
+/** An object on the audio graph - Patch, Node, Port, etc.
+ *
+ * Purely virtual (except for the destructor).
+ *
+ * \ingroup interface
+ */
+class GraphObject : public Raul::Deletable
+                  , public virtual Resource
+{
+public:
+	virtual void set_path(const Raul::Path& path) = 0;
+
+	virtual const Raul::Path&   path()         const = 0;
+	virtual const Raul::Symbol& symbol()       const = 0;
+	virtual GraphObject*        graph_parent() const = 0;
+};
+
+} // namespace Ingen
+
+#endif // INGEN_INTERFACE_GRAPHOBJECT_HPP