[Tagging] Discussion about Multivalued Keys

Tod Fitch tod at fitchdesign.com
Wed Jan 27 16:09:57 UTC 2016

Seems like the mapper should simply report what is there. The data consumer should decide, based on its focus, what is more important.

> On Jan 27, 2016, at 7:52 AM, Matthijs Melissen <info at matthijsmelissen.nl> wrote:
> Hi Colin,
> Thanks for getting this discussion started. I agree it's fine to use
> the proposal template also for proposals that are not about proposing
> a concrete tag.
> One thing to take into account in this discussion is that multi-valued
> keys often move the problem to the data consumer. For that reason I'd
> recommend to avoid them in many cases.
> Take for example your example shop=supermarket, shop=bakery.
> Independent of the exact way of tagging, using a multivalued tagging
> scheme forces the renderer to make a decision between a supermarket
> and a bakery icon. Basically, there is no possible way for the
> renderer to support a multi-valued key here! The renderer might have a
> rule that considers supermarkers always more important than bakeries,
> or vice versa. But I think it's much more useful if the mapper decides
> what's the main function, supermarket or bakery, rather than forcing
> the renderer to make a choice.
> -- Matthijs
> On 27 January 2016 at 16:09, Colin Smale <colin.smale at xs4all.nl> wrote:
>> Dear all,
>> I have created a proposal page as a channel for constructive debate about
>> the way forward. I hope you will all take a look and participate!
>> Although this subject is a bit more than just a proposal for a new tag, I
>> have used the same template. I will try and flesh it out a bit more in the
>> coming days, but everyone is of course welcome to add their stuff.
>> http://wiki.openstreetmap.org/wiki/Proposed_features/Multivalued_Keys
>> --colin
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