|RUIAN reference id of a building
|Used on these elements
|Tools for this tag
You can view the details of the building using a link in the format http://vdp.cuzk.cz/vdp/ruian/stavebniobjekty/<ref:ruian>.
There is an older and deprecated variant of this key named ref:ruian=* as well. Its use is not recommended as it does not distinguish between ids of address nodes and buildings.