code: @Override
      public void add(Iterable<? extends Statement> statements, Resource... contexts) throws RepositoryException {
          Iterator <? extends Statement> iter = statements.iterator();
          while(iter.hasNext()){
              Statement st = iter.next();
              add(st, mergeResource(st.getContext(), contexts));
          }
      }
docs: add triple statements
  
  @param statements
  @param contexts
  @throws RepositoryException