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diff --git a/src/libs/engine/GraphObjectImpl.hpp b/src/libs/engine/GraphObjectImpl.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 GRAPHOBJECTIMPL_H
+#define GRAPHOBJECTIMPL_H
+
+#include <string>
+#include <map>
+#include <cstddef>
+#include <cassert>
+#include <raul/Deletable.hpp>
+#include <raul/Path.hpp>
+#include <raul/Atom.hpp>
+#include "interface/GraphObject.hpp"
+#include "types.hpp"
+
+using Raul::Atom;
+using Raul::Path;
+
+namespace Raul { class Maid; }
+
+namespace Ingen {
+
+class Patch;
+class ProcessContext;
+
+
+/** An object on the audio graph - Patch, Node, Port, etc.
+ *
+ * Each of these is a Raul::Deletable and so can be deleted in a realtime safe
+ * way from anywhere, and they all have a map of metadata for clients to store
+ * arbitrary values in (which the engine puts no significance to whatsoever).
+ *
+ * \ingroup engine
+ */
+class GraphObjectImpl : public Ingen::Shared::GraphObject
+{
+public:
+	typedef std::map<string, Atom> MetadataMap;
+
+	GraphObjectImpl(GraphObjectImpl* parent, const string& name, bool polyphonic=false)
+		: _parent(parent), _name(name), _polyphonic(polyphonic)
+	{
+		assert(parent == NULL || _name.length() > 0);
+		assert(_name.find("/") == string::npos);
+		assert(path().find("//") == string::npos);
+	}
+	
+	virtual ~GraphObjectImpl() {}
+	
+	bool         polyphonic() const                       { return _polyphonic; }
+	virtual void set_polyphonic(Raul::Maid& maid, bool p) { _polyphonic = p; }
+	
+	inline GraphObjectImpl* parent() const { return _parent; }
+	inline const string&    name()   const { return _name; }
+	
+	virtual void process(ProcessContext& context) = 0;
+
+	/** Rename */
+	virtual void set_path(const Path& new_path) {
+		assert(new_path.parent() == path().parent());
+		_name = new_path.name();
+		assert(_name.find("/") == string::npos);
+	}
+	
+	void set_metadata(const string& key, const Atom& value)
+	{ _metadata[key] = value; }
+
+	const Atom& get_metadata(const string& key) {
+		static Atom null_atom;
+		MetadataMap::iterator i = _metadata.find(key);
+		return (i != _metadata.end()) ? (*i).second : null_atom;
+	}
+
+	const MetadataMap& metadata() const { return _metadata; }
+
+	/** The Patch this object is a child of. */
+	virtual Patch* parent_patch() const;
+	
+	/** Path is dynamically generated from parent to ease renaming */
+	inline const Path path() const {
+		if (_parent == NULL)
+			return Path(string("/").append(_name));
+		else if (_parent->path() == "/")
+			return Path(string("/").append(_name));
+		else
+			return Path(_parent->path() +"/"+ _name);
+	}
+
+protected:
+	GraphObjectImpl* _parent;
+	std::string      _name;
+	bool             _polyphonic;
+
+private:	
+	MetadataMap _metadata;
+};
+
+
+} // namespace Ingen
+
+#endif // GRAPHOBJECTIMPL_H