private function _getUpdatedInternalItemsByCallback(array $aSubject, $sKey)
{
$_oCallable = $this->getElement($this->aFieldTypeDefinition, $sKey);
if (!is_callable($_oCallable)) {
return $aSubject;
}
$aSubject[] = call_user_func_array($_oCallable, array());
return $aSubject;
}