|RUIAN reference id of an address point|
|Used on these elements|
|Tools for this tag|
Note! Because of iD's autocompletion, this tag sometimes appears outside the Czech Republic. When it does, it almost always is intended to be the ref=* tag. When encountered, change appropriately!
You can view the details of address point using a link in the format http://vdp.cuzk.cz/vdp/ruian/adresnimista/<ref:ruian:addr>.
There is an older and deprecated version of this key ref:ruian=*. But there are RUIAN ids for address points, buildings, municipalities, parcel of lands etc. So it would be wise to distinguish the ids from each other as they can "meet" on single OSM element.