code: def do_batch(resource_root, elements):
    
    return call(resource_root.post, BATCH_PATH, ApiBatchResponseList,
        data=elements, api_version=6)
docs: Execute a batch request with one or more elements. If any element fails,
    the entire request is rolled back and subsequent elements are ignored.
  
    @param elements: A list of ApiBatchRequestElements
    @return: an ApiBatchResponseList
    @since: API v6