public function getLinkageMeta(); /**
* @param ResourceObjectInterface $resource
*
* @return array<string,string>
*/
private function getLinkageRepresentation(ResourceObjectInterface $resource)
{
$representation = [Document::KEYWORD_TYPE => $resource->getType(), Document::KEYWORD_ID => $resource->getId()];
if (($meta = $resource->getLinkageMeta()) !== null) {
$representation[Document::KEYWORD_META] = $meta;
}
return $representation;
}