public function getChildren()
    {
        $objs = $this->carddavBackend->getCards($this->addressBookInfo['id']);
        $children = [];
        foreach ($objs as $obj) {
            $obj['acl'] = $this->getChildACL();
            $children[] = new Card($this->carddavBackend, $this->addressBookInfo, $obj);
        }

        return $children;
    }