RSS for joomla custom component

Hi,
I use Joomla 1.5 custom component and I tried to add rss feeds. I dont know whats problem, but no data is displayed in firefox google reader.
I tested with chrome and there are displayed information, but just only like html (not styled maybe). And if I tried google reader with chrome, then no information again.

Only what appears in google reader, is the site description.
This is the file, whats going to take rss or smth. Maybe somebody can understand, why is there no information displayed or whats wrong with my code.

$xml = new XMLWriter();
$xml->openURI('php://output');
$xml->startDocument("1.0");
$xml->setIndent(true);

$xml->startElement('rss');
$xml->writeAttribute('version', '2.0');
$xml->writeAttribute('xmlns:g', 'http://base.google.com/ns/1.0'); 
$xml->startElement("channel");
$xml->writeElement("title", $mainframe->getCfg('sitename'));
$xml->writeElement("description", $mainframe->getCfg('MetaDesc'));
$xml->writeElement("link", JURI::root());

if($this->projects){
   // start listings
   foreach ($this->projects as $project){

      $xml->startElement("item");
        $xml->writeElement("g:title", $project[title] );
        $xml->writeElement("g:description", $project[description] );
        $xml->endElement();
   }
}

$xml->endElement(); // rss
$xml->endDocument();
$xml->flush();

PHP: