public function editCell($rowNum, $colNum, $value)
{
$entry = new \SimpleXMLElement("\n <entry\n xmlns=\"http://www.w3.org/2005/Atom\"\n xmlns:gs=\"http://schemas.google.com/spreadsheets/2006\">\n </entry>\n ");
$child = $entry->addChild("xmlns:gs:cell");
$child->addAttribute("row", $rowNum);
$child->addAttribute("col", $colNum);
$child->addAttribute("inputValue", $value);
ServiceRequestFactory::getInstance()->post($this->getPostUrl(), $entry->asXML());
}