Do both Königskinder and The Knot Garden exist in multiple versions?
Königskinder Königskinder (German for "The King's Children") is a stage work by Engelbert Humperdinck that exists in two versions: as a melodrama and as an opera or more precisely a "Märchenoper". The libretto was written by Ernst Rosmer (pen name of Else Bernstein-Porges), adapted from her play of the same name.
Virtual knot In knot theory, a virtual knot is a generalization of the classical idea of knots in several ways that are all equivalent, introduced by .