DOCUMENT_NODE_FACTORY = function (value, objectStack, nodeName) {
  const parentNode = objectStack[objectStack.length - 1].node;
  return createElementNS(parentNode.namespaceURI, 'Placemark');
}
@const
@param {*} value Value.
@param {Array<*>} objectStack Object stack.
@param {string} [nodeName] Node name.
@return {Node|undefined} Node.