On Wed, Mar 20, 2019 at 02:46:54PM +0100, Phil Sutter wrote: [...] > Speaking of sets, it would be awesome if we could support something > like: > > | osf genre { "Linux:2.4", "Windows" } We can support something like this: osf version { "Linux:2.4", "Windows\*" } where the wildcard specifies any Windows version. We need a new set type though, to deal with strings. > i.e., having elements with varying "granularity". Do you think that's > feasible? If so, how could we support that? Maybe using a concatenation > like: > > | osf name . osf version { "Linux" . "2.4", "Windows" . "*" } Not sure we want this level of granularity. Matching the version without no OS genre does not look useful when I look at how the osf engine works. I'd prefer we go for the first approach you have mentioned here above.