Question: What is the name of the child in the opera Tristan und Isolde by Siegfried Wagner?
Paraphrase: What is the name of the infant in the opera Tristan und Isolde with the aid of Siegfried Wagner?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q1324254 wdt:P87 ?answer . ?answer wdt:P40 wd:Q143867}
Answer: Richard Wagner