<http://www.reddit.com/r/webdev/comments/2gypch/is_schemaorg_still_a_thing/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.edugorilla.com/forums/topic/%E0%A4%9F%E0%A5%87%E0%A4%B2%E0%A5%80%E0%A4%B5%E0%A4%BF%E0%A5%9B%E0%A4%A8-%E0%A4%95%E0%A4%BE-%E0%A4%86%E0%A4%B5%E0%A4%BF%E0%A4%B7%E0%A5%8D%E0%A4%95%E0%A4%BE%E0%A4%B0-%E0%A4%95%E0%A4%BF%E0%A4%B8/>