Question: What is the official language of Ladonia, which is the target area of Probus Journal?
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/Probus_(journal)> onto:academicDiscipline ?uri}