<https://www.vintage-mustang.com/threads/is-putting-a-factory-pb-on-a-non-pb-car-ok.355653/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.vintage-mustang.com/threads/is-putting-a-factory-pb-on-a-non-pb-car-ok.355653/#post-2292783>