[Geocoding] [OpenStreetMap] #4504: Suburb should be shown only if the element is inside the city of which the suburb belong

[OpenStreetMap]

#4504: Suburb should be shown only if the element is inside the city of which the
suburb belong
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 Reporter:  AnyFile    |       Owner:  geocoding@…                
     Type:  defect     |      Status:  new                        
 Priority:  minor      |   Milestone:                             
Component:  nominatim  |     Version:                             
 Keywords:             |  
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 If I made a search for
 Via Archimede, Bresso, Italia

 In the response I get ( place_id="37659795" osm_type="way"
 osm_id="27393925")

 as well as <city>Bresso</city>
 I also get
 <suburb>Niguarda</suburb>

 Now the suburb Niguarda (place_id=10578283 osm_node=957188590), is a
 suburb of the city Milano, not of the city Bresso.

 Now it is clear from the documentation of suburb the a suburb is: "[...] a
 major sub-division of a place=town or place=city"

 So I should assume that a suburb should not extend outside the city.

 In this case the suburb is just a point and there is no a relation with is
 boundary, so it is not clear where the suburb ends, but surely it should
 not extend beyond the boundary of the city.

 Looking from a different prospective (this may be easier to understand and
 implement), a suburb should be attached to an element only if the
 corresponding city or town is attached.

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Ticket URL: <https://trac.openstreetmap.org/ticket/4504>
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