<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/BreadcrumbList>
<http://www.mnn.com/earth-matters/space/stories/cosmic-candy-planetary-nebula-photos-captured-by-chandra-x-ray-observato?magic_tabs_comment_callback_tab=0&referer=node%2F179689&args=a%3A1%3A%7Bi%3A0%3Bs%3A6%3A%22179689%22%3B%7D>