old_contents: from been.core import SiteFeedSource, source_registry
  
  class Flickr(SiteFeedSource):
      url_format = 'http://api.flickr.com/services/feeds/photos_public.gne?id={username}&lang=en-us&format=rss_200'
      kind = 'flickr'
      def process_event(self, event):
          event['summary'] = 'posted photo ' + event['summary']
          return event
  source_registry.add(Flickr)
  
new_contents: from been.core import SiteFeedSource, source_registry
  
  class Flickr(SiteFeedSource):
      url_format = 'http://api.flickr.com/services/feeds/photos_public.gne?id={username}&lang=en-us&format=rss_200'
      kind = 'flickr'
      def process_event(self, event):
          event['summary'] = 'posted photo ' + event['summary']
          event['collapse'] = True
          return event
  source_registry.add(Flickr)
  
subject: Mark flickr events collapsible.