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diff --git a/src/server/events/SetMetadata.hpp b/src/server/events/SetMetadata.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_EVENTS_SETMETADATA_HPP
+#define INGEN_EVENTS_SETMETADATA_HPP
+
+#include <vector>
+#include "raul/URI.hpp"
+#include "shared/ResourceImpl.hpp"
+#include "QueuedEvent.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class GraphObjectImpl;
+class PatchImpl;
+class CompiledPatch;
+
+namespace Events {
+
+/** \page methods
+ * <h2>POST</h2>
+ * As per HTTP (RFC2616 S9.5).
+ *
+ * Append properties to a graph object.
+ *
+ * An object can have several properties with a single predicate.
+ * POST appends properties without modifying or removing existing properties.
+ */
+
+/** \page methods
+ * <h2>PUT</h2>
+ * As per HTTP (RFC2616 S9.6).
+ *
+ * Set properties of a graph object, or create an object.
+ *
+ * An object can have several properties with a single predicate.
+ * \li If the object does not yet exist, the message must contain sufficient
+ * information to create the object (e.g. known rdf:type properties, etc.)
+ * \li If the object does exist, a PUT removes all existing object properties
+ * with predicates that match any property in the message, then adds all
+ * properties from the message.
+ */
+
+class SetPortValue;
+
+/** Set properties of a graph object.
+ * \ingroup engine
+ */
+class SetMetadata : public QueuedEvent
+{
+public:
+	SetMetadata(
+			Engine&                     engine,
+			SharedPtr<Request>          request,
+			SampleCount                 timestamp,
+			bool                        create,
+			Resource::Graph             context,
+			const Raul::URI&            subject,
+			const Resource::Properties& properties,
+			const Resource::Properties& remove = Resource::Properties());
+
+	~SetMetadata();
+
+	void pre_process();
+	void execute(ProcessContext& context);
+	void post_process();
+
+private:
+	enum ErrorType {
+		NO_ERROR,
+		NOT_FOUND,
+		INTERNAL,
+		BAD_OBJECT_TYPE,
+		BAD_VALUE_TYPE
+	};
+
+	enum SpecialType {
+		NONE,
+		ENABLE,
+		ENABLE_BROADCAST,
+		POLYPHONY,
+		POLYPHONIC,
+		CONTROL_BINDING
+	};
+
+	typedef std::vector<SetPortValue*> SetEvents;
+
+	QueuedEvent*                 _create_event;
+	SetEvents                    _set_events;
+	std::vector<SpecialType>     _types;
+	std::vector<SpecialType>     _remove_types;
+	Raul::URI                    _subject;
+	Resource::Properties         _properties;
+	Resource::Properties         _remove;
+	Ingen::Shared::ResourceImpl* _object;
+	PatchImpl*                   _patch;
+	CompiledPatch*               _compiled_patch;
+	std::string                  _error_predicate;
+	bool                         _create;
+	Resource::Graph              _context;
+
+	SharedPtr<ControlBindings::Bindings> _old_bindings;
+};
+
+} // namespace Server
+} // namespace Ingen
+} // namespace Events
+
+#endif // INGEN_EVENTS_SETMETADATA_HPP