Hi, Because there is 2 notions: building address and contact address.
In fact if you have create an addr:housenumber, all contacts addresses need use contact:housenumber. That is the same to all duplicate addr:* value if there exists on a contact POI. There is one POI (an unique) with addr:* (this addr poi can be locate on same node as entrance or on building. It depends on choice of schema ) and one or more POI with contact:* . In this case * can be same key=value as addr:* values for exemple: http://www.openstreetmap.org/node/369521753 old values <tag k="addr:city" v="Warszawa"/> <tag k="addr:housenumber" v="129"/> <tag k="addr:street" v="Aleja Niepodległości"/> must be replace by: <tag k="contact:city" v="Warszawa"/> <tag k="contact:housenumber" v="129"/> <tag k="contact:street" v="Aleja Niepodległości"/> Because building <https://www.openstreetmap.org/way/160379164> is already tagged addr:city=Warszawa addr:housenumber=129 addr:street=Aleja Niepodległości Best, Jérôme
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