public OWLDataPropertyHGDB(IRI iri) {
   this.iri = iri;
   this.builtin =
       iri.equals(OWLRDFVocabulary.OWL_TOP_DATA_PROPERTY.getIRI())
           || iri.equals(OWLRDFVocabulary.OWL_BOTTOM_DATA_PROPERTY.getIRI());
 }
 /**
  * Determines if this is the owl:topDataProperty
  *
  * @return <code>true</code> if this property is the owl:topDataProperty otherwise <code>false
  *     </code>
  */
 public boolean isOWLTopDataProperty() {
   return iri.equals(OWLRDFVocabulary.OWL_TOP_DATA_PROPERTY.getIRI());
 }