<https://secure.gravatar.com/avatar/56c7e0c53e70e6c1be4df739d58f9350?s=96&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.stickyaides.com/a/permatex-the-right-stuff-grey-vs-black/>