<https://secure.gravatar.com/avatar/65cecf3b27775fec7b70cb19b24b44e4?s=96&d=mm&r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.avrilexpo.com/if-you-read-one-article-about-read-this-one-3/>