<https://en.certificationanswers.com/#/schema/person/df489c885736fece8bfef6fb2c02a829>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://en.certificationanswers.com/hubspot-delivering-sales-services-answers/when-implementing-hubspot-crm-for-a-client-should-you-help-them-create-custom-properties/>