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diff --git a/src/libs/client/ObjectModel.hpp b/src/libs/client/ObjectModel.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 OBJECTMODEL_H
+#define OBJECTMODEL_H
+
+#include <cstdlib>
+#include <map>
+#include <iostream>
+#include <string>
+#include <algorithm>
+#include <cassert>
+#include <boost/utility.hpp>
+#include <sigc++/sigc++.h>
+#include <raul/Atom.hpp>
+#include <raul/Path.hpp>
+#include <raul/SharedPtr.hpp>
+
+using std::string; using std::map; using std::find;
+using std::cout; using std::cerr; using std::endl;
+using Raul::Atom;
+using Raul::Path;
+
+namespace Ingen {
+namespace Client {
+
+typedef map<string, Atom> MetadataMap;
+
+
+/** Base class for all GraphObject models (NodeModel, PatchModel, PortModel).
+ *
+ * There are no non-const public methods intentionally, models are not allowed
+ * to be manipulated directly by anything (but the Store) because of the
+ * asynchronous nature of engine control.  To change something, use the
+ * controller (which the model probably shouldn't have a reference to but oh
+ * well, it reduces Collection Hell) and wait for the result (as a signal
+ * from this Model).
+ *
+ * \ingroup IngenClient
+ */
+class ObjectModel : boost::noncopyable
+{
+public:
+	virtual ~ObjectModel();
+
+	const Atom& get_metadata(const string& key) const;
+	void set_metadata(const string& key, const Atom& value)
+		{ _metadata[key] = value; metadata_update_sig.emit(key, value); }
+
+	const MetadataMap&     metadata() const { return _metadata; }
+	inline const Path&     path()     const { return _path; }
+	SharedPtr<ObjectModel> parent()   const { return _parent; }
+
+	// Signals
+	sigc::signal<void, const string&, const Atom&> metadata_update_sig; 
+	sigc::signal<void>                             destroyed_sig; 
+
+protected:
+	friend class Store;
+	
+	ObjectModel(const Path& path);
+	
+	virtual void set_path(const Path& p)               { _path = p; }
+	virtual void set_parent(SharedPtr<ObjectModel> p) { assert(p); _parent = p; }
+	virtual void add_child(SharedPtr<ObjectModel> c) = 0;
+	virtual void remove_child(SharedPtr<ObjectModel> c) = 0;
+	
+	void add_metadata(const MetadataMap& data);
+	
+	void set(SharedPtr<ObjectModel> model);
+
+	Path                    _path;
+	SharedPtr<ObjectModel> _parent;
+	
+	MetadataMap _metadata;
+};
+
+
+} // namespace Client
+} // namespace Ingen
+
+#endif // OBJECTMODEL_H