public function getChildrenByProperty(string $property, string $value = ''): array {
        $query = $this->getChildrenQuery();
        if ($value != '') {
            $param = new HasValue($property, $value);
        } else {
            $param = new HasProperty($property);
        }
        $query->addParameter($param);
        return $this->fedora->getResourcesByQuery($query);
    }