<https://forums.getpaint.net/topic/20622-psfilterpdn-2023-01-25/page/5/#comment-356060>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forums.getpaint.net/topic/20622-psfilterpdn-2023-01-25/page/5/>