Hi Marko,
> For example, a parking facility or a building could be tagged both
> as a point at the entrance, and as an area.
This is against OSM good practice, see recommendations:
http://wiki.openstreetmap.org/wiki/One_feature,_one_OSM_element
I guess, that it's not easy to reliable detect duplicates. Maybe better
correct problem at source?
--
Best regards,
Andrzej
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