public function extractCardinality(string $id)
    {
        foreach ($this->relations as $relation) {
            $result = $relation->xpath(sprintf('//*[@rdf:about="%s"]/rdfs:label', $this->getPropertyUrl($id)));
            if (count($result)) {
                preg_match('/\(.\.\..\)/', $result[0]->asXML(), $matches);

                return $matches[0];
            }
        }

        return false;
    }