<https://flyaspitfire.com/2018/04/04/raf-100-at-biggin-hill-1st-april-2018/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://flyaspitfire.com/2018/04/04/raf-100-at-biggin-hill-1st-april-2018/>