<https://secure.gravatar.com/avatar/c15d894ce02f00b4821f8f56cd9dc59a?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ebookvan.com/building-recommendation-systems-in-python-and-jax-second-early-release/>