/**
* returns a unique key for an element
*
* @param $element
* @return string
*/
public static function getUniqueKey($element)
{
if ($element instanceof Object\AbstractObject) {
return Object\Service::getUniqueKey($element);
} elseif ($element instanceof Document) {
return Document\Service::getUniqueKey($element);
} elseif ($element instanceof Asset) {
return Asset\Service::getUniqueKey($element);
}
}
