Smalyshev added a comment.

The idea of localized units is great, however I wonder about the following 
things. Let's say we express quantities in all kinds of different units, so if 
we have a property for the area of the country, one country would have it in 
square meters, another in square kilometers, yet another in square feet or 
hectares. Now we want to see which country has the biggest area. That would be 
quite a challenge. So if we want Wikidata to be machine-friendly data 
collection that could be processed by automated tools, how do we ensure the 
quantities of some kind have units that can be automatically handled together 
efficiently - i.e. even if we know how to convert square kilometers to square 
feet and vice versa, how do we efficiently index such things?


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To: Smalyshev
Cc: Aklapper, daniel, JanZerebecki, adrianheine, Snaterlicious, thiemowmde, 
JeroenDeDauw, aude, Tobi_WMDE_SW, Stryn, Smalyshev, Wikidata-bugs



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