<https://www.omg.org/spec/NIEM-UML/About-NIEM-UML/>
<http://www.w3.org/2002/07/owl#versionIRI>
<https://www.omg.org/spec/NIEM-UML/3.0/Beta1/About-NIEM-UML/>
<https://www.omg.org/spec/NIEM-UML/3.0/Beta1/>