Hi Jukka,

Thank you again for the explanation and information about GDAL history!!


> If I understand right you consider that instead of having now in the 
> multipolygon layer relation_id as osm_id and way_id as osm_way_id it would be 
> better to have way_id as osm_id and relation_id as osm_relation_id.  Perhaps 
> yes, but for my mind the difference is not huge. 
Yes.


> I guess that when the developer of the OSM driver stopped using the 
> “polygons” layer they made the driver to write also the way polygons into the 
> existing “multipolygons” layer. That layer already had osm_id so a new field 
> osm_way_id was simply added into that layer.
That perfectly explains my question!!


> If you can prove that there are some general use cases where renaming the id 
> fields of the multipolygons layer would be a big improvement, please file a 
> feature request.

I do not have any big or moderate improvement in mind. Your explanation on OSM 
driver history cleared why is that so.


Thank you once again Jukka.
I owe you at least a beer for the help you provided for the last couple of 
weeks!
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