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diff --git a/src/gui/RDFS.hpp b/src/gui/RDFS.hpp
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+++ b/src/gui/RDFS.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 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_GUI_RDF_HPP
+#define INGEN_GUI_RDF_HPP
+
+#include <map>
+#include <set>
+
+#include <glibmm/ustring.h>
+
+#include "raul/URI.hpp"
+#include "raul/SharedPtr.hpp"
+
+namespace Ingen {
+
+class World;
+
+namespace Client { class ObjectModel; }
+
+namespace GUI {
+
+namespace RDFS {
+
+/** Set of URIs. */
+typedef std::set<Raul::URI> URISet;
+
+/** Map of object labels, keyed by object URI. */
+typedef std::map<Raul::URI, Glib::ustring> Objects;
+
+/** Return the label of @p node. */
+Glib::ustring
+label(World* world, const LilvNode* node);
+
+/** Set @p types to its super/sub class closure.
+ * @param super If true, find all superclasses, otherwise all subclasses
+ */
+void classes(World* world, URISet& types, bool super);
+
+/** Get all instances of any class in @p types. */
+Objects
+instances(World* world, const URISet& types);
+
+/** Get all the types which @p model is an instance of. */
+URISet types(World* world, SharedPtr<const Client::ObjectModel> model);
+
+/** Get all the properties with domains appropriate for @p model. */
+URISet properties(World* world, SharedPtr<const Client::ObjectModel> model);
+
+} // namespace RDFS
+} // namespace GUI
+} // namespace Ingen
+
+#endif // INGEN_GUI_RDF_HPP