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diff --git a/ingen/AtomSink.hpp b/ingen/AtomSink.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2015 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_ATOMSINK_HPP
+#define INGEN_ATOMSINK_HPP
+
+#include <cstdint>
+
+#include "ingen/ingen.h"
+#include "lv2/atom/atom.h"
+
+namespace ingen {
+
+/** A sink for LV2 Atoms.
+ * @ingroup IngenShared
+ */
+class INGEN_API AtomSink {
+public:
+	virtual ~AtomSink() = default;
+
+	/** Write an Atom to the sink.
+	 *
+	 * @param msg The atom to write.
+	 * @param default_id The default response ID to use if no
+	 * patch:sequenceNumber property is present on the message.
+	 *
+	 * @return True on success.
+	 */
+	virtual bool write(const LV2_Atom* msg, int32_t default_id=0) = 0;
+};
+
+} // namespace ingen
+
+#endif // INGEN_ATOMSINK_HPP