 		/* abstract */ protected function requestColumnFromSource(columnReference:IColumnReference, proxyColumn:ProxyColumn):void { }
 
 		/**
-		 * url
 		 * The url of the data source.
 		 * This is included here because most IDataSource implementations will have a URL.
 		 * It is a special case to have an IDataSource without one.

		}

		/**
		 * delayColumnRequest
		 * This will put an initialized proxy column into the list of pending requests.
		 * It will also call initializeHierarchySubtree() for a subtree of the hierarchy, if a subtree is missing.
		 * This function can be overridden to have different behavior, but this definition is recommended.

		}
		
		/**
		 * This function will call handlePendingColumnRequest() on each pending column request.
		 */
		private function handleAllPendingColumnRequests():void
