private xfaStream:XFADataStream = new XFADataStream();
     
     public function set host(value:INavigatorHost):void
     {
             if(value)
             {
             //
             //Initialize the navigator.
             //
                 
             //Set the host instance to allow centralized access
             NavigatorHostInstance.initialize(value);
     
             //Add handlers for read/write                       
             xfaStream.addEventListener(XFADataReadyEvent.XFA_DATA_READY, onXFADataReady);
             xfaStream.addEventListener(XFADataLoadFailedEvent.XFA_DATA_LOADFAILED, onXFADataLoadFailed);                                 
             xfaStream.addEventListener(XFADataSavedEvent.XFA_DATA_SAVED, onXFADataSaved);
             xfaStream.addEventListener(XFADataSaveFailedEvent.XFA_DATA_SAVEFAILED, onXFADataSaveFailed);
         }    
         else
         {
             //
             //Shutdown the navigator
             //
             NavigatorHostInstance.release();
     
                 //other cleanup ...
             }
     }
     
     public function readData() : void
     {
      try
       {
         xfaStream.readXML();                    
          }
      catch(e:Error)
       {
         //UNEXPECTED ERROR
       } 
     }
     
     public function writeData(newXML:XML) : void
     {
         try
         {                    
             xfaStream.writeXML(xml);
         }
         catch(e:Error) 
         {
             //UNEXPECTED ERROR 
         } 
     }
      
     //event handler for when xfa data successfully loaded via XFADataStream
     private function onXFADataReady(event:XFADataReadyEvent) : void
     {
         //The xfa data loaded successfully 
         var info:XML = event.data;
     }
     
     //event handler for when xfa data fails to load via XFADataStream
     private function onXFADataLoadFailed(event:XFADataLoadFailedEvent) : void
     {
             //Failed to load data. See event.error
     }
     
     //event handler for when xfa data successfully saved via XFADataStream
     private function onXFADataSaved(event:XFADataSavedEvent) : void
     {
             //The xfa data was saved successfully");                
     }
     
     //event handler for when xfa data fails to save via XFADataStream
     private function onXFADataSaveFailed(event:XFADataSaveFailedEvent) : void
     {
             //Failure to save data. See event.error
     }