[Tagging] My "weirdly unnatural aversion to relations"

Mateusz Konieczny matkoniecz at tutanota.com
Tue Oct 2 19:13:32 UTC 2018

2. Oct 2018 18:01 by pla16021 at gmail.com <mailto:pla16021 at gmail.com>:

> On Tue, Oct 2, 2018 at 4:39 PM Kevin Kenny <> kevin.b.kenny at gmail.com <mailto:kevin.b.kenny at gmail.com>> > wrote:
>> On Tue, Oct 2, 2018 at 11:15 AM Paul Allen <>> pla16021 at gmail.com <mailto:pla16021 at gmail.com>>> > wrote:
>> >> Why selecting buildings and tagging them to site relation is easier than selecting building and adding them to  a multipolygon realation?
>> Are you labouring under the misapprehension that a multipolygon has to
>> have a single outer ring?
> Sorta.  As I read it the outer ring is a polygon.  That polygon might be composed of several> different ways but together they form an continuous outline. 

You may have multiple disjointed outer ways.  See for example 

https://www.openstreetmap.org/relation/61707 <https://www.openstreetmap.org/relation/61707>

that is a park split by a major road.

Or https://www.openstreetmap.org/relation/2226518 <https://www.openstreetmap.org/relation/2226518> - protected area that is not continous.


> Even if a multipolygon can have many disconnected outers, it seems I'd have to make each university>  building an outer.  And then there are no inners.

Exactly. What you think can be improved to make this misconception less popular?


> an abuse of the concept,

Not at all. 

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