Neomerx\JsonApi\Contracts\Document\DocumentFactoryInterface::createDocument PHP Метод

    public function createDocument();

 /**
  * @inheritdoc
  */
 public function meta($meta)
 {
     $docWriter = $this->documentFactory->createDocument();
     $docWriter->setMetaToDocument($meta);
     $docWriter->unsetData();
     return $this->encodeToJson($docWriter->getDocument());
 }