[Tagging] Tunnels and bridges

[Malcolm Herring]

On 01/02/2013 15:02, fly wrote:
> 4. Not only a problem of this thread but we need to get much more developers to
> support relations (eg. renderes, editors, search engines and other consumers).
> This includes evaluating existing relations and adjusting them to be useful.

+1
A relation explicitly establishes an intended association between 
features, whereas shared nodes do not. Many features share nodes, but 
have no intended association.