Venice: support informal street name in place-based addressing

[McCio]

What did you search for?

1. https://nominatim.openstreetmap.org/ui/search.html?street=Via+Galuppi%2C+221&city=Burano
2. https://nominatim.openstreetmap.org/ui/search.html?street=San+Martino+Destra%2C+221&city=Burano

What result did you get?

1. https://nominatim.openstreetmap.org/ui/details.html?osmtype=W&osmid=173218617&class=highway
2. https://nominatim.openstreetmap.org/ui/details.html?osmtype=N&osmid=1840614184&class=amenity

What result did you expect?

Both should result in https://nominatim.openstreetmap.org/ui/details.html?osmtype=N&osmid=1840614184&class=amenity
Relevant tags:

addr:hamlet=Burano
addr:housenumber=221
addr:place=San Martino Destra
contact:street=Via Baldassarre Galuppi

Further details

The addresses in Venice are mapped using the addr:place for the sestiere (~neighbourhood). So it was proposed locally to use contact:street for the street names, not to break all the standards of having either addr:place or addr:street, but never both.
In OsmAnd both searches work, and the POI address is displayed as "contact:street (addr:place) addr:housenumber".

[lonvia]

So, reading up on this, Venice officially has a housennumber numbering schema, where the number refers to the neighborhood (sestieri). There still are street names and businesses usually cite the street they are on together with the housenumber that actually refers to the neighbourhood.

I think we'd have to go implementation-wise for a schema where we create a street address and a place address, similar to what is needed with conscription numbers, only that the house number would be the same. This will have to be part of the "addresses as first-class citizen" project.