docs: private URI[] asURI( List<Object> values ) {
          ValueFactory<URI> factory = valueFactories.getUriFactory();
          URI[] res = new URI[values.size()];
          for (int i = 0; i < res.length; i++) {
              res[i] = factory.create(((GregorianCalendar)values.get(i)).getTime());
          }
          return res;
      }