Hi Rod and Pierre, Just for when it's time for: I saw it in iD sometime ago, it's possible to add a second tag of "bulding" in the same object: if it was previously tagged the first visible atribute for a building key (like "building=construction, or damaged, etc"), secondly it can be typed in the second row "building" then iD automatically shows a second key as "building_1" (actually it happens the same "_1" in many other keys), and one can tag, for example, "=school", etc (like in a secondary survey on the ground or on previous satellite images) . It seems that can preserve both informations. Don't know more about it. Cheers, Sérgio
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