<https://secure.gravatar.com/avatar/76e244deaef30cdff7428f2f6e959d87?s=96&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tikibook.com/top-lists/qu%C3%A1n-l%C6%B0%C6%A1n-ngon-nh%E1%BA%A5t>