<https://pngaa.org/unauthorised/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://pngaa.org/unauthorised/?mepr-unauth-page=9062&redirect_to=%2Farticle%2Fmemories-of-my-time-in-tpng-by-phil-willy%2F>