[Tagging] housenumber on node and area

[johnw]

> 
> Depending on the country, state, area the address does not necessarily refer to the building.
> 
> In Australia the address refers to the property ie the plot of ground that is defined by the cadastral plan.
> 
> So those plots of ground may  be 600 sq m or 1,000,000 hectares and may have zero, one or many buildings.
> 
> Easiest way to plot these is on a node at the access point to the plot of ground.
‘

In Japan it is the plot. There are no street addresses anywhere in Japan. Zero.  - only plot addresses. 99% of all roads have no name or ref - all residential, unclassified, and most tertiary roads have no name or ref. everything is based on the land. There are building numbers on top of the plot numbers as well, for commercial use - but it is a mixed bag - nothing is ever the same. 

In America is is similarly tied to the land. Houses can have a mailing address that is on a road where the building cannot be accessed - but the building is accessed through an easement on another street. 
There may be a hundred post boxes for various apartments - but all located at a single street address). the land has the address. everything else is apartment or suite numbers.

Also, my parents inherited land in the high desert. There is ****nothing*** there for 500 square miles. no buildings. Not even a mailbox post. Every single plot has an address (for tax purpose). It is a flat expanse of worthless land. 

In some places it is the residence. It is the building itself. 

Some places it is assigned to entrance - the the “entrance” itself has a unique address. 

so we have a varying system where:

- The land area has the address. 
- The the building structure has the address
- The entrance node has the address.

OSM needs to be be flexible to handle these varying addressable systems. 

Also, if someone knows the address but not the area - dropping a node with an address is preferable to an incorrect landuse area.

This means accepting street addresses on nodes, weather they are points on land, on buildings, or part of an entrance=yes tag.  

Javbw
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