Question: Which of the continents that Digitalb worked in, was christine rolfes born in?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Digit-Alb> onto:regionServed ?uri. <http://dbpedia.org/resource/Christine_Rolfes> onto:birthPlace ?uri}