[Tagging] My "weirdly unnatural aversion to relations"

Paul Allen pla16021 at gmail.com
Tue Oct 2 15:14:16 UTC 2018


On Tue, Oct 2, 2018 at 4:02 PM Mateusz Konieczny <matkoniecz at tutanota.com>
wrote:

Why selecting buildings and tagging them to site relation is easier than
> selecting building and adding them to  a multipolygon realation?
>

I can't even begin to comprehend how that would possibly work.

Well, maybe I can.  If we make the outer role of the polygon "not
university" then we can add the
individual, scattered buildings as inner role "university."  Seems bizarre
to me, but feasible.  It's
analogous to the way you can use a multipolygon to define a wood with ponds
in it.  Except
"wood" is a concrete term everyone understands but "not university" is not.

If we make the outer role "university" then the inner roles have to be all
the places that the
university buildings are not, with role "not university."  Not only do we
have the conceptual
problem of "not university" but it would be very fiddly to map.

I can't see any way of using multipolygons for this case that makes sense
and is easy to do.  If
you can, then please explain it.

A site relation, however, is simple.  Just add each building to the
relation.  Why do you consider
this to be no easier than the multipolygon approach?

-- 
Paul
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