<https://www.artnews.com/art-news/news/upbeat-mood-mixed-sales-at-maastricht-fair-1215/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.artnews.com/art-news/news/upbeat-mood-mixed-sales-at-maastricht-fair-1215/>