Compatible::getChildElements

public function getChildElements(ItemIdentifier $parent, int $childEntityTypeId): array
{
	$data = $this->getList([
		'select' => ['ID'],
		'filter' => [
			$this->parentIdFieldName => $parent->getEntityId(),
		],
	]);

	$children = [];
	foreach ($data as $row)
	{
		$children[] = new ItemIdentifier($childEntityTypeId, (int)$row['ID']);
	}

	return $children;
}