def _get_pair_nodes(root_node):
    """
    Internal method to get "pair" nodes under root_node
    """

    method_elem = root_node
    in_configs_elem_list = method_elem.getElementsByTagName("inConfigs")
    in_configs_elem = in_configs_elem_list[0]
    pair_elems_list = in_configs_elem.getElementsByTagName("pair")
    return pair_elems_list