<https://blog.firstreference.com/#/schema/person/aafe12cf7b7b525325ea2f0c5a82259f>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.firstreference.com/beware-of-using-one-month-notice-per-year-of-service-rule-of-thumb/>