[OSM-talk] Bridges

[Dave]

> I just feal there is no point going to the troubles of having a differnt tag 
> for each feature, so highway=footway, then bridge=yes, or style=yes, or 
> cowstandinginmyway=yes, or statues=yes.  Since only one of these things can 
> ever be there at once, (no object can share the same phisicial space), So 
> why not therefore just put them all under 1 tag.
>   

This isn't entirely true: you could quite easily find a footbridge 
blocked by a cow ;-).
In this case the way would need to be marked as both cowstandinginmyway 
and bridge.
These aren't physical objects so much as physical properties of objects, 
and the schema needs to be able to cope with multiple properties per object.

I'm sure there are plenty of real examples which don't involve cows!