/**
* Comparison function for sorting literals by their id
*
* @param Literal $a
* @param Literal $b
* @return int 0 if the literals are equal, 1 if b is larger than a, -1 else
*/
private function compareLiteralsById(Literal $a, Literal $b)
{
if ($a->getId() === $b->getId()) {
return 0;
}
return $a->getId() < $b->getId() ? -1 : 1;
}
