<https://www.codycrosssolutions.com/turning-that-frown-upside-down-uses-for-a-shoebox-answers/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.codycrosssolutions.com/turning-that-frown-upside-down-uses-for-a-shoebox-answers/>