[Tagging] Discussion about Multivalued Keys

Matthijs Melissen info at matthijsmelissen.nl
Wed Jan 27 17:02:47 UTC 2016


On 27 January 2016 at 17:18, Richard Fairhurst <richard at systemed.net> wrote:
> Matthijs Melissen wrote:
>> 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!
>
> That's not at all true. A rendering chain can choose to split out multiple
> values and then render a different icon for each one. You don't even need
> any preprocessing - you can do it on-the-fly with a SQL query, and I've done
> exactly that in one (Mapnik-based) map I've produced.

Do you have an demo rendering (screenshot is fine) for that?

-- Matthijs



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