code: public boolean isReservedVocabulary() {
          return Namespaces.OWL.inNamespace(namespace) || Namespaces.RDF.inNamespace(namespace) || Namespaces.RDFS
                  .inNamespace(namespace) || Namespaces.XSD.inNamespace(namespace);
      }
docs: Determines if this IRI is in the reserved vocabulary. An IRI is in the
  reserved vocabulary if it starts with
  &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt; or
  &lt;http://www.w3.org/2000/01/rdf-schema#&gt; or
  &lt;http://www.w3.org/2001/XMLSchema#&gt; or
  &lt;http://www.w3.org/2002/07/owl#&gt;
  
  @return {@code true} if the IRI is in the reserved vocabulary, otherwise
  {@code false}.