+ 'litepub' => (object)['@id' => 'http://litepub.social/ns#', '@type' => '@id'],
+ 'sc' => (object)['@id' => 'http://schema.org#', '@type' => '@id'],
+ 'pt' => (object)['@id' => 'https://joinpeertube.org/ns#', '@type' => '@id'],
+ 'mobilizon' => (object)['@id' => 'https://joinmobilizon.org/ns#', '@type' => '@id'],
+ ];