Question: How many acts were in the music drama in which Heinz Zednik played David?
Sentence (from "Heinz Zednik"): Heinz Zednik (born February 21, 1940) is an Austrian operatic tenor, closely associated with the character tenor roles of Wagner such as Mime and Loge ("Der Ring des Nibelungen") and David ("Die Meistersinger von Nürnberg").
Relevant evidence: Yes