'CreativeCommons\Feed' => Extension\CreativeCommons\Feed::class,
'DublinCore\Entry' => Extension\DublinCore\Entry::class,
'DublinCore\Feed' => Extension\DublinCore\Feed::class,
+ 'GooglePlayPodcast\Entry' => Extension\GooglePlayPodcast\Entry::class,
+ 'GooglePlayPodcast\Feed' => Extension\GooglePlayPodcast\Feed::class,
'Podcast\Entry' => Extension\Podcast\Entry::class,
'Podcast\Feed' => Extension\Podcast\Feed::class,
'Slash\Entry' => Extension\Slash\Entry::class,