<https://amandawhitedigital.com/2021/02/06/google-ppc-update-changes-to-keyword-types/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://amandawhitedigital.com/2021/02/06/google-ppc-update-changes-to-keyword-types/>