it's not silly to ask. vienna is the bew(blue eyed white) gene. you can have bew, vc(vienna carrier) or vm(vienna marked). there is a little more to it than that but that is the gist of it.
The problem with Vienna, is that it is a color which really should only be bred to itself. BEW x BEW = BEW, which is easy to follow. Cross BEW to just about anything else, and you usually get a rabbit with white markings that somewhat resemble the pattern of the Dutch breed, which may or may not have blue eyes. You may get a rabbit with just a tiny snip of white or a couple of white toes, or very rarely, a rabbit with no visible white at all, that still carries Vienna (v). The problem is, there are variations of the Dutch marking genes (Du) that do all of these things, too. Some breeds have BEW as one of their showable colors - the Netherland Dwarf being one. When you get a Dwarf that has just a tiny white snip on its nose, is that a sneaky Dutch marking or is it Vienna? Most of the time, it's Dutch, because the BEW is still not very common. But some people assume any white that isn't clearly Broken patterning must be Vienna, and call anything with white on its face or feet Vienna marked. Not a problem most of the time, but if anyone is trying to produce BEW's, those Dutch marked rabbits won't get 'em there. So unless one knows that a rabbit has BEW behind it, it's best to assume that the non-showable white markings come from Dutch genes.
yes bew should only be bred to bew but if you only have one rabbit that is and need the other than you have to breed it keep a baby of opposite sex to breed back to create it to make your own line of them. there is many mismarks and sports out there because people don't do research before they breed them and don't understand how the gene works. vienna gene has no relation to the dutch gene. my last 3 litters using my bew buck for 2 litters of mini rexes and 1 litter of velveteen lops has thrown in 20 babies, only one had a mismarked blaze and boots. everyone else is solid colors and no one has blue eyes. so i have to keep a doe from the vlops and one from the rexes to bred back to him so i have it in both lines to make a bew doe to breed bew to bew later. he was bred to all non- bew carriers but all babies from him are vienna gene carriers even if they don't show it. when i do their pedigrees i always list they are vienna carriers even if they don't show it. because people need to know if it is in the line or not if bew is listed to far back the gens they may not know it and i don't want people ending up with a bunch of sports later, not knowing what it is or how to breed or get rid of it if they don't want it in the lines.