This would be a very interesting experiment that would show how much this two data sets correlate. The starting premises (distance, involving tags and properties) should be heavily reviewed and scrutinized in this mailing list though.
I think we should have a (semi-official) list of correlating sets of tags in OSM and properties in Wikidata that guarantee something in one database is the same type of entity as some other thing in the other database. For example, if something in Wikidata has a pair: P31=Q16970 (instance of=church) then in OSM this is: amenity=place_of_worship + religion=christian If we had a database with these pairs of property and tag sets, we could have a small map with dots that show where we have churches, on an article about churches in Wikipedia. I'm sure more uses could be found. Janko
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