Maybe it is time to start a new thread and move this over to the tagging list.
> On Nov 2, 2015, at 6:45 AM, Colin Smale <[email protected]> wrote: > > > > >> On 2015-11-02 13:24, Marc Gemis wrote: >> >> >>> >>> >>> that's the difference between explicit and implicit mapping. If you are >>> explicit, you know that it should be like that, if you rely on the absence >>> of information / tags you might fall on your nose because the data wasn't >>> complete etc. >>> For some stuff it might sense to use the "no" to avoid misinterpretations >>> by wrong asumptions, e.g. shop=tobacco, sells:cigarettes=yes, >>> sells:cigarette_tobacco=no >>> or highway=motorway_link, oneway=no. >>> >>> also: sells:vegetables=only >>> sells:cabbage=yes >>> sells:carrots=yes >>> ... >> >> some shops only sells certain products during certain periods of the year. >> All bakeries in Belgium sell chocolate figures during Sinterklaas-period and >> chocolate eggs during easter period. >> We will need something like "sells:chocolate_easter_eggs:yes @ >> (easter_period)" OTOH, every Belgian knows that she can buy that in a bakery >> in those periods. Do we really need to tag that ? It's common knowledge >> (when you're an Belgian). >> Also the assortment of fruitcakes and sandwiches is larger during the >> weekends. >> >> For Christmas eve or New Years Eve, you might also be able to order >> starters. Butchers and bakeries might even become deli's during this period. > There are many things in OSM which are time-dependent. Max speeds and other > restrictions on the road, opening hours of attractions etc etc. With a bit of > luck we can re-use these mechanisms if the product assortment needs to vary > by time. > > BUT let's not make the product categories too narrow. "cakes" might be OK, > but "fruit_cakes" may be a step too far. "chocolates" might be OK, but > "chocolate_easter_eggs" is getting a bit too specific. All IMHO by the way, > this is not an exact science... But is it easier to start with broad > categories and then subdivide them as the need arises, or to start with > detailed categories and then consider clustering, consolidating and > rationalising them later? I suggest the first approach, as experience teaches > that the clustering/consolidation/rationalisation rarely happens. So better > to stick to the broader categories to start with. > >> >> What about supermarkets and wine? In Belgium and France it is normal that >> they sell wine. Not so in Sweden, where wine is sold via state-operated >> shops. >> Would it be enough to write shop=supermarket; sells:wine=no ? > > Sounds about right to me... except it is not only wine, but all alcoholic > drinks isn't it? Do we need to distinguish between wine, beer and spirits? I > suspect that would be very relevant, as most supermarkets do not sell spirits > but some do, with a special license. So you should add sells:beer=no as well, > bearing in mind that "beer" here is intended as a category not a single > product - I would expect it to include cider as well, for example. > > //colin > > > > _______________________________________________ > talk mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk
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