[Geocoding] [OpenStreetMap] #4985: query "washington, D.C." result shows "Johnson City, Tennessee"

[OpenStreetMap]

#4985: query "washington, D.C." result shows "Johnson City, Tennessee"
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  Reporter:  drkrtz     |      Owner:  geocoding@…
      Type:  defect     |     Status:  new
  Priority:  minor      |  Milestone:
 Component:  nominatim  |    Version:
Resolution:             |   Keywords:
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Comment (by lonvia):

 You seem to have found the one variant that does not work. ;) "washington
 d.c." works fine, as does "washington dc" and "washington, dc".

 Basically, Nominatim does not know that "d.c." is an abbreviation for the
 [http://nominatim.openstreetmap.org/details.php?place_id=98170241 District
 of Columbia] as there is only "DC" given as reference. It should be a bit
 more clever in handling these optional full stops, might be doable with
 some regex magic in the normalization stage.

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Ticket URL: <https://trac.openstreetmap.org/ticket/4985#comment:2>
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