code: @Override
      public NodeSet<OWLClass> getDataPropertyDomains(OWLDataProperty pe,
              boolean direct) throws InconsistentOntologyException,
              FreshEntitiesException, ReasonerInterruptedException,
              TimeOutException {
          throw new ReasonerInternalException(
                  "getDataPropertyDomains not implemented");
      }
docs: Gets the named classes that are the direct or indirect domains of this
  property with respect to the imports closure of the root ontology. The
  classes are returned as a {@link NodeSet}
  .
  
  @param pe
  The property expression whose domains are to be retrieved.
  @param direct
  Specifies if the direct domains should be retrieved (
  <code>true</code>), or if all domains should be retrieved (
  <code>false</code>).
  
  @return Let
  <code>N = getEquivalentClasses(DataSomeValuesFrom(pe rdfs:Literal))</code>
  .
  <p>
  If <code>direct</code> is <code>true</code>: then if
  <code>N</code> is not empty then the return value is
  <code>N</code>, else the return value is the result of
  <code>getSuperClasses(DataSomeValuesFrom(pe rdfs:Literal), true)</code>.
  <p>
  If <code>direct</code> is <code>false</code>: then the result of
  <code>getSuperClasses(DataSomeValuesFrom(pe rdfs:Literal), false)</code>
  together with <code>N</code> if <code>N</code> is non-empty.
  <p>
  (Note, <code>rdfs:Literal</code> is the top datatype).
  
  @throws InconsistentOntologyException
  if the imports closure of the root ontology is inconsistent
  @throws FreshEntitiesException
  if the signature of the object property expression is not
  contained within the signature of the imports closure of the
  root ontology and the undeclared entity policy of this
  reasoner is set to {@link FreshEntityPolicy#DISALLOW}.
  @throws ReasonerInterruptedException
  if the reasoning process was interrupted for any particular
  reason (for example if reasoning was cancelled by a client
  process)
  @throws TimeOutException
  if the reasoner timed out during a basic reasoning operation.
  See {@link #getTimeOut()}.