Question: List the common official language of the ladonia and Empire of Atlantium ?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Ladonia_(micronation)> onto:officialLanguage ?uri. <http://dbpedia.org/resource/Empire_of_Atlantium> onto:officialLanguage ?uri . }