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diff --git a/src/gui/RDFS.hpp b/src/gui/RDFS.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 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_GUI_RDF_HPP
+#define INGEN_GUI_RDF_HPP
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "ingen/types.hpp"
+#include "lilv/lilv.h"
+
+namespace ingen {
+
+class World;
+
+namespace client { class ObjectModel; }
+
+namespace gui {
+
+namespace rdfs {
+
+/** Set of URIs. */
+typedef std::set<URI> URISet;
+
+/** Label => Resource map. */
+typedef std::map<std::string, URI> Objects;
+
+/** Return the label of `node`. */
+std::string label(World* world, const LilvNode* node);
+
+/** Return the comment of `node`. */
+std::string comment(World* world, const LilvNode* node);
+
+/** Set `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);
+
+/** Set `types` to its super/sub datatype closure.
+ * @param super If true, find all supertypes, otherwise all subtypes.
+ */
+void datatypes(World* world, URISet& types, bool super);
+
+/** Get all instances of any class in `types`. */
+Objects instances(World* world, const URISet& types);
+
+/** Get all the types which `model` is an instance of. */
+URISet types(World* world, SPtr<const client::ObjectModel> model);
+
+/** Get all the properties with domains appropriate for `model`. */
+URISet properties(World* world, SPtr<const client::ObjectModel> model);
+
+/** Return the range (value types) of `prop`.
+ * @param recursive If true, include all subclasses.
+ */
+URISet range(World* world, const LilvNode* prop, bool recursive);
+
+/** Return true iff `inst` is-a `klass`. */
+bool is_a(World* world, const LilvNode* inst, const LilvNode* klass);
+
+} // namespace rdfs
+} // namespace gui
+} // namespace ingen
+
+#endif // INGEN_GUI_RDF_HPP