code: @Override
      public List<Statement> expand(Statement s) {
          Term sub = s.getSubject();
          Term obj = s.getObject().getTerm();
          final RelationshipType rel = s.getRelationshipType();
  
          final Statement stmt = new Statement(obj);
          stmt.setObject(new Object(sub));
          stmt.setRelationshipType(rel);
  
          return asList(new Statement[] { stmt });
      }
docs: {@inheritDoc}