<https://viragohelp.com/phpbb3/viewtopic.php?p=833089999b0576ec52f76edd256973030bb9>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://viragohelp.com/phpbb3/viewtopic.php?p=8330&sid=89999b0576ec52f76edd256973030bb9>