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./othercms/xenForo 2.2.8/src/XF/Mvc/Renderer/Rss.php
<?php

namespace XF\Mvc\Renderer;

class Rss extends Xml
{
    protected function initialize()
    {
        parent::initialize();
        $this->response->contentType('application/rss+xml');
    }

    public function getResponseType()
    {
        return 'rss';
    }
}