2 adet kapatma parantezi atlamışsın gibi görünüyor. aşağıdaki kodu dener misin?

<?php
include 'teknoadminpanelmlh/site-ayarlari.php';

header('Content-Type: text/xml');

echo '<?xml version="1.0" encoding="UTF-8" ?>';

echo '<rss version="2.0" xmlns:g="http://base.google.com/ns/1.0">';
?>

<channel>
<title><?php echo $ayar['title']; ?></title> 
<link><?php echo $site; ?></link> 
<description><?php echo $ayar['description']; ?></description> 

<?php 
$veriler = $db->prepare("SELECT * FROM urun WHERE dil = :dil AND durum = 1");
$veriler->execute(array(':dil' => $_GET['link']));
if($veriler->rowCount()){
    foreach($veriler as $veri){
?>
<item> 
<g:id><?php echo $veri['id']; ?></g:id>
<title><?php echo $veri['baslik']; ?></title>
<link><?php echo $site;?>urun/<?php echo $veri['link']; ?></link>
<description><?php echo $veri['aciklama']; ?></description>
<?php
    $ilk_resim = '';
    $resimler = $db->prepare("SELECT id, resim FROM urun_resim WHERE urun_id = :urun_id ORDER BY sira ASC");
    $resimler->execute(array(':urun_id' => $veri['id']));
    if($resimler->rowCount()){
        foreach($resimler as $resim){
            if($ilk_resim == ''){
                $ilk_resim = $site.'upload/'.$resim['resim'];
            }
            echo'<g:additional_image_link>'.$site.'upload/'.$resim['resim'].'</g:additional_image_link>';
        }
    }
    if(!empty($ilk_resim)){
        echo'<g:image_link>'.$ilk_resim.'</g:image_link>';
    }
?>
<g:price><?php echo  fiyat_noktali($veri['fiyat'] * $kur_fiyatlari[1]).' TRY'; ?></g:price> 
<g:availability>in_stock</g:availability> 
<g:google_product_category><?php echo $veri['id']; ?></g:google_product_category> 

<?php
    if(!empty($veri['marka_id'])){
        $marka = $db->prepare("SELECT baslik, resim FROM marka WHERE id = :marka_id LIMIT 1");
        $marka->execute(array(':marka_id' => $veri['marka_id']));
        $marka = $marka->fetch(PDO::FETCH_ASSOC);
        if($marka){
            echo'<g:brand>'.$marka['baslik'].'</g:brand>';
        }else{
            echo'<g:brand>'.$ayar['title'].'</g:brand>';
        }
    }else{
        echo'<g:brand>'.$ayar['title'].'</g:brand>';
    }
?>							

</item> 
<?php
    }
}
?>
</channel>
</rss>