<https://www.crisisprevention.com/Blog/Don-t-Wait-Until-It-s-Too-Late-to-Fulfill-State-De>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.crisisprevention.com/Blog/Don-t-Wait-Until-It-s-Too-Late-to-Fulfill-State-De>