[Event(name="propertyRequest", type=...)]
 public class SomeDataViewMediator extends EventDispatcher {
    private function onDataRequestFromView(event:Event):void {
       var request:PropertyRequest =
             new PropertyRequest.newInstance(
                   vmRef,
                   "name");
       dispatchEvent(request);
    }
 
    // Option 1 - use EventHandler for the response
    [EventHandler(name="propertyResponse")]
    private function onDataRetrieved(response:SingleObjectDataResponse):void {
       // good to go with response.result as StringDataObject
    }
 
    // Option 2 - use ResponseHandler for the response
    [ResponseHandler(name="propertyResponse")]
    public function onDataRetrieved(request:PropertyRequest,
                                     result:StringDataObject,
                                     error:Error):void {
       // good to go with type-strict result
    }
 }