[Osmf-talk] Tagging standards

[osm.sanspourriel at spamgourmet.com]

Le 18/10/2022 à 17:14, Brian M. Sperlongano - zelonewolf at gmail.com a écrit :

> Well, this is absolutely possible.  Geographically-aware processing is
> completely within our technical ability.  Now, this would be pretty
> terrible for a key like "smoothness", but there are many very
> legitimate cultural, legal, socioeconomical and organizational
> differences between countries that might make it absolutely
> appropriate for the same tag to have slightly differing meanings in
> different countries.

One good example is highway network, as the hierarchy is optimized for a
country or a region. So primary/secondary/tertiary/unclassified are for
different roads.

But normally you should try to stick to more or less universal keys and
values and add a secondary tag for specificities.

One example is amenity=school, for France we have on top of that a
secondary tag school:FR to match the French system.

Suffixed by the country as the possible values in France could be
different as in Belgium for instance.

> The real problem is when "objects tagged a certain way by Joe mean XYZ
> but it means ABC when that tag is used by Alice". That's when the
> meaning becomes ambiguous and impossible to process.

Then a NEW tag should be found and completed by a secondary tag saying
if it's XYZ or ABC.

Some big mistakes were done by an editor because a developer didn't new
the legal context and considered 2 different tags as being the same,
making the difference unusable.

But sometimes differences remain. For instance the usage or non usage of
associatedStreet. It's forbidden in some countries and welcomes in
others (were you have multiple language, adding the information on each
way, each housenumber fills the database with noise and typos). AFAIK, I
would prefer the editor to work with associatedStreet for a better
modelling but allow people to map "the dirty way", having the
optimization (or tag sharing if you prefer to avoir associatedStreet)
made behind the scene.

Jean-Yvon
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