There's one fundamental question about wikidata tags; how do you tag multiple objects that have the same wikidata tag? For example, a wikidata entry about a church and a connected monastery. When I was writing the Wikidata proposal on our wiki, I've put a rule that only one object in OSM can have the same wikidata=* tag. So when there are more ways in OSM that represent one element in Wikidata, we should put them in a relation and put the wikidata tag in the relation.
Since then I changed my opinion a bit, but I'm not sure if we should just put wikidata=* on all ways, or if we should invent a new tag, wikidata:part=* and put that tag on all the objects. The problem with putting wikidata=* on several objects is that people could come to an idea to put wikidata=Q3947 (entry about houses) on all houses, or wikidata=12280 on all bridges. That's why I think wikidata:part=* is the best way to deal with this, and make multiple wikidata tags with the same value invalid. Janko
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