On Tue, 8 Jan 2019 at 15:27, Rory McCann <r...@technomancy.org> wrote:
> > How do you do that? To me "sells:blah=no" is clear: that blahs are, by > default, sold in this type of thing, but aren't here. Is there a > standard way to do that with semicolon'ed values? > Yes. You list all the things that are sold there and omit blah from that list. Admittedly, that leaves uncertainty: is blah unlisted because the mapper got tired of typing in all the items sold, or because the mapper is unsure, or because blah is definitely not sold there despite expectations that it is the type of shop that would sell it. The uncertainty could be resolved for consumers that run algorithms by using "!blah" but would likely be misinterpreted by consumers that are not versed in computer programming. Or, assuming that we have a sells=* tag then, we could add a does_not_sell tag. It's not insoluble using lists. It's a matter of which approach works best for all concerned. -- Paul -- Paul
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