Might seem pedantic but I think worth considering. I find this too implicit, when looked at from the perspective of the caller of this code. I'd much rather the caller pass in `descriptor=u"Suite File"` then have it magically show up. Also if the caller _does_ pass in another value for `descriptor`, it'll still use the default instead!

For a more concrete example in this case, you'll want to pass in a different descriptor for the media suite, so every call to `Suite` might as well set it explicitly.