Tagging Opera

It seems that I completely missed the OperaTrackStyle guide on MusicBrainz. Perhaps, because it is still unofficial and there is no link to it from the main page or the Classical style guides. Basically it says that tracts should be tagged as follows...

opera_name[, catalogue ###]: Act XX[, Scene XX]. [performance_type] "name_of_the_song" [(character1, character2, ...)]

With an example being...

Don Giovanni, Op. 500: Act I, Scene III. Duettino "Là ci darem la mano" (Don Giovanni, Zerlina)

You know, finding the information and trying to do this the "right" way can be pretty complicated!