 
 		public function toString() : String
 		{
-			var str : String	= "Vertex(index=" + _index;
+			var str : String	= 'Vertex(index=' + _index;
 
 			for (var field : String in _propertyToStream)
-				str += ", " + field + "=" + getProperty(field);
+				str += ', ' + field + '=' + getProperty(field);
 
-			str += ")";
+			str += ')';
 
 			return str;
 		}

		 * @return
		 *
		 */
		public function get index() : int	{ return _index; }

		public function VertexReference(stream 	: IVertexStream,
								 		index	: int	= -1)

			var stream 			: VertexStream	= _propertyToStream[propertyName];
			
			if (!(stream.usage & StreamUsage.READ))
				throw new Error('Unable to read data from vertex stream.');
			
			var format 			: VertexFormat 	= stream.format;
			var index			: int			= _index * format.size
