osm_id: id of corresponding OSM object
class: general object class (corresponds to tag key of primary OSM tag)
type: subclass of object (corresponds to tag value of primary OSM tag)
- admin_level: see http://wiki.openstreetmap.org/wiki/Admin_level
+ admin_level: see https://wiki.openstreetmap.org/wiki/Admin_level
rank_search: rank in search hierarchy
- (see also http://wiki.openstreetmap.org/wiki/Nominatim/Development_overview#Country_to_street_level)
+ (see also https://wiki.openstreetmap.org/wiki/Nominatim/Development_overview#Country_to_street_level)
rank_address: rank in address hierarchy (determines orer in address)
place_id: internal key (may differ between different instances)
country_code: ISO country code