[Tagging] default value for "oneway"

[Philip Barnes]

On Thu, 2014-08-28 at 13:52 -0300, John Packer wrote:
>         For a street, there is no practical difference nowadays
>         between "no"
>         and "unset", which is a smell for me. Either way means no.
> For the software? No, there isn't a difference.
> For the mapper?  Yes, there is a difference. 
> 
> 
>         Since nowadays NULL for a street means oneway=no a change in
>         the
>         semantics would be still be possible as far as the database is
>         concerned. If you go today to the database and update all
>         oneway
>         attributes for streets which are blank to "no", the meaning of
>         the
>         database is equivalent.
> Theorically speaking, yes, you could add oneway=no to every street,
> and get a functionally equivalent database (from the software's POV).
> 
> But, in practice, people most likely wouldn't agree with that (this
> change would be reverted).
> 
+1

To use add oneway=no in selected areas to confirm the road has been
surveyed is fine, but not everywhere as that causes tag clutter and
makes it difficult for a mapper to see the important tags. 

Phil (trigpoint)



> 
> 
> 2014-08-28 12:33 GMT-03:00 Xavier Noria <fxn at hashref.com>:
>         On Thu, Aug 28, 2014 at 5:21 PM, Simon Poole <simon at poole.ch>
>         wrote:
>         
>         > In any case there are roughly 45 million highway segments on
>         which a
>         > oneway tag could make sense, vs. roughly 6 million
>         oneway=yes and 1.5
>         > million oneway=no. I suspect that it is really -far- too
>         late to change
>         > the semantics of this specific attribute.
>         
>         
>         Since nowadays NULL for a street means oneway=no a change in
>         the
>         semantics would be still be possible as far as the database is
>         concerned. If you go today to the database and update all
>         oneway
>         attributes for streets which are blank to "no", the meaning of
>         the
>         database is equivalent.
>         
>         Same for motorways, replace all NULLs with "yes". Equivalent
>         database.
>         
>         For a street, there is no practical difference nowadays
>         between "no"
>         and "unset", which is a smell for me. Either way means no.
>         
>         I believe the default is useful for the UI, to preselect a
>         value for
>         example so that the user has to do nothing in the majority of
>         street
>         creations, less useful as a way to interpret NULLs because
>         then you
>         don't know what has been confirmed.
>         
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