function readAuthorityURL(node, objectStack) {
  const authorityObject = readFormatOnlineresource(node, objectStack);
  if (authorityObject) {
    authorityObject['name'] = node.getAttribute('name');
    return authorityObject;
  }
  return undefined;
}
@param {Element} node Node.
@param {Array<*>} objectStack Object stack.
@return {Object|undefined} Authority URL object.