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diff --git a/src/server/PluginImpl.hpp b/src/server/PluginImpl.hpp
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+++ b/src/server/PluginImpl.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2015 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_ENGINE_PLUGINIMPL_HPP
+#define INGEN_ENGINE_PLUGINIMPL_HPP
+
+#include "ingen/Resource.hpp"
+#include "raul/Symbol.hpp"
+
+#include <cstdlib>
+
+namespace ingen {
+
+class URIs;
+
+namespace server {
+
+class BlockImpl;
+class BufferFactory;
+class Engine;
+class GraphImpl;
+
+/** Implementation of a plugin (internal code, or a loaded shared library).
+ *
+ * Conceptually, a Block is an instance of this.
+ */
+class PluginImpl : public Resource
+{
+public:
+	PluginImpl(ingen::URIs& uris, const Atom& type, const URI& uri)
+	    : Resource(uris, uri)
+	    , _type(type)
+	    , _presets_loaded(false)
+	    , _is_zombie(false)
+	{
+	}
+
+	virtual BlockImpl* instantiate(BufferFactory&      bufs,
+	                               const Raul::Symbol& symbol,
+	                               bool                polyphonic,
+	                               GraphImpl*          parent,
+	                               Engine&             engine,
+	                               const LilvState*    state) = 0;
+
+	virtual const Raul::Symbol symbol() const = 0;
+
+	const Atom& type() const            { return _type; }
+	void        set_type(const Atom& t) { _type = t; }
+	bool        is_zombie() const       { return _is_zombie; }
+	void        set_is_zombie(bool t)   { _is_zombie = t; }
+
+	typedef std::pair<URI, std::string> Preset;
+	typedef std::map<URI, std::string>  Presets;
+
+	const Presets& presets(bool force_reload=false) {
+		if (!_presets_loaded || force_reload) {
+			load_presets();
+		}
+
+		return _presets;
+	}
+
+	virtual void update_properties() {}
+
+	virtual void load_presets() { _presets_loaded = true; }
+
+	virtual URI bundle_uri() const { return URI("ingen:/"); }
+
+protected:
+	Atom    _type;
+	Presets _presets;
+	bool    _presets_loaded;
+	bool    _is_zombie;
+
+private:
+	PluginImpl(const PluginImpl&) = delete;
+	PluginImpl& operator=(const PluginImpl&) = delete;
+};
+
+} // namespace server
+} // namespace ingen
+
+#endif // INGEN_ENGINE_PLUGINIMPL_HPP