> > 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). 2014-08-28 12:33 GMT-03:00 Xavier Noria <f...@hashref.com>: > On Thu, Aug 28, 2014 at 5:21 PM, Simon Poole <si...@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. > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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