May I come back to the navigation aspect. Let's assume I have a single square building aligned with the compass directions. It is between two parallel East<>West roads. It is placed closer to the road on the North side. Its entrance is on the South side from the road to the South. There is a fence around the plot that stretches all the way from one road to the other. The access is by a gate in the fence to the South. No footpath or driveway is on the map. With other words, a quite frequent situation in OSM. If I put the house number on the building the navigation device brings me to a point close to the house on the North road, where there is no entrance. If I place the number on a node close to where the gate is on the South road, then the navigation device brings me to the desired place. But I have no information about the association between the number on the gate and the building.
If you think this through we need a means to connect logically the number-bearing entrance to the house it belongs to, IF we want to have the number-building association as information in the map. But do we need this information at all? Is it not enough to know that we have to go the gate with the house number, if we want to go to the house with that number. How I have to move on the property to get from the gate to the house is not (necessarily) information that is on the map.
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