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
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