+ 'dc' => (object)['@id' => 'http://purl.org/dc/terms/', '@type' => '@id'],
+ 'toot' => (object)['@id' => 'http://joinmastodon.org/ns#', '@type' => '@id'],
+ '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'],
+ 'fedibird' => (object)['@id' => 'http://fedibird.com/ns#', '@type' => '@id'],
+ 'misskey' => (object)['@id' => 'https://misskey-hub.net/ns#', '@type' => '@id'],
+ ];