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diff --git a/src/common/interface/Port.hpp b/src/common/interface/Port.hpp
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+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave 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 PORT_H
+#define PORT_H
+
+#include <raul/Atom.hpp>
+#include "GraphObject.hpp"
+#include "DataType.hpp"
+
+namespace Ingen {
+namespace Shared {
+
+
+/** A Port on a Node.
+ *
+ * Purely virtual (except for the destructor).
+ *
+ * \ingroup interface
+ */
+class Port : public virtual GraphObject
+{
+public:
+ virtual bool is_input() const = 0;
+ virtual DataType type() const = 0;
+ virtual Raul::Atom value() const = 0;
+};
+
+
+} // namespace Shared
+} // namespace Ingen
+
+#endif // PORT_H