protected static function dataSetupNode($node, $documentID)
{
// search are return if alredy exists
foreach (self::$documents[$documentID]->dataNodes as $dataNode) {
if ($node->isSameNode($dataNode)) {
return $dataNode;
}
}
// if doesn't, add it
self::$documents[$documentID]->dataNodes[] = $node;
return $node;
}