public function listXmlAction()
 {
     $baseStr = "<?xml version='1.0' standalone='yes'?><rows></rows>";
     $xml = new SimpleXMLElement($baseStr);
     $updateFile = new UpdateFile();
     $updateFileIterator = $updateFile->getIteratorActive();
     $alterTable = new AlterTable();
     $channel = null;
     $ctr = 1;
     foreach ($updateFileIterator as $item) {
         if ($channel === null || $channel != $item->channel) {
             $channel = $item->channel;
             $channelXml = $xml->addChild('row', $channel);
             $channelXml->addAttribute('id', $ctr++);
             $channelXml->addChild('cell', $channel);
         }
         $parent = $channelXml->addChild('row');
         $parent->addAttribute('id', $item->updateFileId);
         $parent->addChild('cell', $item->name . ' (v' . $item->version . ')');
         $parent->addChild('cell', $item->status);
         $parent->addChild('cell', '');
     }
     header('content-type: text/xml');
     $this->view->content = $xml->asXml();
     $this->render('list-xml');
 }