[OSM-dev] ways with 'spurs'

[Robert Hart]

> 
> That /is/ tagging it twice. It puts duplicate data in the database. If
I
> make a spelling mistake (or there is an offical change of name or
> status), it has to be fixed it twice etc. (yes I know I can fix it
twice
>  in one go if I am using the right tools, but that's not the point).
> 
> The data model has this flexibility built in. It just seems stupid to
> not use it.
> 

I agree that any single entity should be only tagged once, however that
is not always possible with the current data model. For example with
roads that change classification along their length, are partially one
way, are very long, are dual carriageway, etc. etc.

This is why the "nodes-ways-superways" data model was proposed. (where
ways are ordered lists of nodes, and one or more ways are grouped into
superways, which can be tagged)

The "nodes-ways-superways" model could also be thought of as extending
segments to allow more than two nodes, and hence vastly improving their
usefulness.

Rob




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