code: public static Triple mapSubject(final Triple t, final String resourceUri, final String destinationUri) {
          final Node destinationNode = createURI(destinationUri);
          return mapSubject(t, resourceUri, destinationNode);
      }
docs: Maps the subject of t from resourceUri to destinationUri to produce a new Triple.
  If the triple does not have the subject resourceUri, then the triple is unchanged.
  
  @param t triple to be remapped.
  @param resourceUri resource subject uri to be remapped.
  @param destinationUri subject uri for the resultant triple.
  @return triple with subject remapped to destinationUri or the original subject.