Question: List the party of the office holder which also has the affiliation with Congress Socialist party ?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/otherParty> <http://dbpedia.org/resource/Congress_Socialist_Party> . ?x <http://dbpedia.org/ontology/otherParty> ?uri . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/OfficeHolder>}