From OpenStreetMap Wiki
This page describes tags that are common to multiple geobase data sets and how they are mapped to OSM attributes.
|Geobase Attribute||Attribute Value||OSM tag||Description|
|nid||uuid||geobase:=>uuid|| A GeoBase node id that identifies the GeoBase element that the OSM element maps too.
| The name of the geobase dataset that the GeoBase node can be found in. This is imported to allow users to easily find the source data for node. The value GeoBase publishes is dependent on how they divide the datasets. For datasets divided by province the datasetName is the province name. For datasets divided by NTS tile. the datasetName is the tile name.
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