> one tag is supported for displaying "one kind of thing" That's not at all the same as "One feature, one OSM element".
The basic principle is that you don't create 2 different database objects for the same thing: you don't map a single school as a node and as an area (closed way) around the node. Similarly, it's a good idea to add only one main feature tag to a database object. While some mappers like to save time by adding barrier=hedge to an amenity=school closed way, this makes it ambiguous: is the hedge an area or a line? If there is a name, is it the name of the hedge or the name of the school? A human can easily pick the right answer, but computers are not so good at this. -- Joseph Eisenberg On 4/6/20, Martin Koppenhoefer <dieterdre...@gmail.com> wrote: > Am Mo., 6. Apr. 2020 um 14:00 Uhr schrieb Kevin Kenny < > kevin.b.ke...@gmail.com>: > >> That would also allow us to address Joseph Eisenberg's objection (in >> the talk page on the WIki) that the proposal violates the 'one object, >> one tag' principle. > > > > there is no such principle (AFAIK a principle like this is tried to adhere > to in OSM-Carto, where they try that one tag is supported for displaying > "one kind of thing" (and to which there is at least the exception of > highway=footway and highway=path with foot=designated, etc.). But this > isn't a general OSM principle (where we also generally try to avoid > different tags with the same meaning, but accept their creation if there > are reasons). > The principle in OSM tagging is "One feature, one OSM element", and it will > always work out if you apply the "correct interpretation", because the real > world doesn't have "features", they come into existence with us defining > what a feature is. E.g. a School delimited by a fence could be seen as 2 > features: a school and a fence, or it could be seen as one feature, a > fenced off school. > > Cheers > Martin > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
