What is <Operone opera ID> of <Parsifal> ?
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Which means{Operone opera ID} for {Parsifal} ?
SELECT DISTINCT ?u WHERE { resource:Parsifal property:Operone_opera_ID ?u }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q220340> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P5358> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q220340 wdt:P5358 ?answer}