W dniu 21.05.2015 11:30, André Pirard napisał(a):
An amenity is not an object, it's an attribute of an object like a
building.
That would be more true for building=school probably (building with the
attribute of being suitable for school use) - things are very
complicated under the surface.
"School" (as the example):
1) may be located inside the building as one of many things,
2) may use the whole building (this is the simplest case, but we tend to
think about it the most),
3) may also contain the area or even be located in more buildings.
It is in fact the object, however very abstract - as any other
institution. It may have the same address as the building, but it may
have a different one (quite natural if it contains more than one
building with housenumbers - only one of them may have the same
housenumber as the institution).
As we try to be GIS database and hold close to the ground truth in case
of doubt, we have to simplify a lot, but the right tool in general would
be using relations for such abstract things.
--
"The train is always on time / The trick is to be ready to put your bags
down" [A. Cohen]
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