Assertion: libretto | /r/HasProperty | written
Facets:
Source sentences:
text: In a contract dated 8 July, Guardasoni promised that he would engage a castrato "of leading quality" (this seems to have mattered more than who wrote the opera); that he would "have the libretto caused to be written...and to be set to music by a distinguished maestro".
text: Kvapil's libretto, based on Erben's and Božena Němcová's work, was written before he had any contact with the composer.