Question: In which fields are both Paul Demiville and Sylvain levi experts?
SPARQL:
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Paul_Demiéville> <http://dbpedia.org/property/fields> ?uri. <http://dbpedia.org/resource/Sylvain_Lévi> <http://dbpedia.org/property/fields> ?uri . }