Question: What is the official language of Ladonia, which is the target area of Probus Journal?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Ladonia_(micronation)> <http://dbpedia.org/ontology/officialLanguage> ?uri. <http://dbpedia.org/resource/Probus_(journal)> <http://dbpedia.org/ontology/academicDiscipline> ?uri}