Question: What is { cause of death } of { William McKinley } that { instance of } is { attack }?
Paraphrase: What kind of attack caused William McKinley to die?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q35041 p:P509 ?s . ?s ps:P509 ?obj . ?s pq:P31 wd:Q81672 }