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diff --git a/libs/pbd/pbd/property_list.h b/libs/pbd/pbd/property_list.h
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+++ b/libs/pbd/pbd/property_list.h
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+/*
+    Copyright (C) 2010 Paul Davis
+
+    This program 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.
+
+    This program 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 more 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __pbd_property_list_h__
+#define __pbd_property_list_h__
+
+#include <map>
+
+#include "pbd/property_basics.h"
+
+class XMLNode;
+
+namespace PBD {
+class PropertyList : public std::map<PropertyID, PropertyBase*>
+{
+public:
+	PropertyList();
+        
+	virtual ~PropertyList();
+
+        void add_history_state (XMLNode* before);
+
+        /** Add a property (of some kind) to the list. Used when
+            constructing PropertyList's that describe a change/operation.
+        */
+        bool add (PropertyBase* prop);
+
+	/* Code that is constructing a property list for use
+	 * in setting the state of an object uses this.
+         *
+         * Defined below, once we have Property<T>
+	 */
+	template<typename T, typename V> bool add (PropertyDescriptor<T> pid, const V& v);
+
+protected:
+	bool _property_owner;
+};
+
+/** A variant of PropertyList that does not delete its
+ *  property list in its destructor. Objects with their
+ *  own Properties store them in an OwnedPropertyList
+ *  to avoid having them deleted at the wrong time.
+ */
+class OwnedPropertyList : public PropertyList
+{
+public:
+	OwnedPropertyList();
+
+	/* Classes that own property lists use this to add their
+	 * property members to their plists. Note that it takes
+         * a reference argument rather than a pointer like
+         * one of the add() methods in PropertyList.
+	 */
+	bool add (PropertyBase& p);
+};
+
+}
+
+#endif /* __pbd_property_list_h__ */