<https://www.omg.org/spec/NIEM-UML/>
<http://www.omg.org/techprocess/ab/SpecificationMetadata/publicationDate>
"2015-02-18T00:00:00-0500"^^<http://www.w3.org/2001/XMLSchema#dateTime>
<https://www.omg.org/spec/NIEM-UML/3.0/Beta1/>