[OSM-talk] Shared nodes between non-routable objects?

[Mike N.]

> I see a case for and against them. Since they're not routable, I don't
> immediately see a problem. Nodes are simply points, and a point can be
> shared between two objects, and so why use extra nodes if they're not
> needed?

  I don't have a problem with modeling objects like buildings or 2 
boundaries this way.   2 Boundaries can share nodes because it models the 
real world.   In the cases where I've gone back and updated for building 
demolition / reconstruction there was very little extra effort because of 
the shared nodes.   Edits requiring object separation typically involve only 
a  few nodes and is not a big problem.