<https://dev.to/jsheridanwells/tdd-and-exception-handling-with-xunit-in-asp-net-core-4fee>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://dev.to/jsheridanwells/tdd-and-exception-handling-with-xunit-in-asp-net-core-4fee>