image caption attribute

[teethgrinder]

Hello,

I have little information about rss feeds.My feeds are in the link " http://feed.sirtcantalilar.com " By your package I was able to add them to my site. Now I am trying to add captions and attributions of images but still cant get them with the microsofts http://appproducer.bing.com/AppBuilder/FeedMapper.. Is it possible to make it ? my route is

Route::get('/', function()
{

    $feed = Rss::feed('2.0', 'UTF-8');
    $feed->channel(array(
                'title' => 'Sırtçantalılar blog yazıları', 
                'description' => 'Gezi rehberi. Yurtdışı ucuz tatil ve gezilecek yerler hakkında gezi rehberi tarzında hazırlanmış gezi yazıları içeren gezi ve seyahat sitesi.', 
                'link' => 'http://www.sirtcantalilar.com/'));
    $posts = Post::with('thumbnail')->where('status', '=', 1)->get();

    foreach ($posts as $post) {

        $feed->item(array(
            'title' => replace_tr($post->title), 
            'description|cdata' =>  (!empty($post->minicontent) ) ? $post->minicontent : (Str::words(strip_tags(replace_tr($post->content() )),50) ),
            'guid' => $post->id,
            'author' => replace_tr($post->author->name), 
            'media:content | cdata' => "http://www.sirtcantalilar.com/uploads/img/posts/thumbnails/".$post->id. "/thumb-" .$post->thumbnail->name,
            'media:text' => $post->thumbnail->name,
            'link' => 'http://www.sirtcantalilar.com/blog/'.$post->slug,
        'pubdate' => $post->created_at,
        'lastbuilddate' => $post->updated_at
        ));
    }

     $feed->save('uploads/blogs.xml');

    return Response::make($feed, 200, array('Content-Type' => 'text/xml'));
});