Ok, lets take the second example of Wind turbines: power=generator + generator:source=wind
The first tag "power=generator" is a more general tag and you have the specific tag "generator:source=wind". For the second tag you have a Wiki page: http://wiki.openstreetmap.org/wiki/Tag:generator:source%3Dwind On this wiki-page you can find that the general tag "power=generator" is obligatory. So this tag delivers no additional information, because it exist in each case. In my eyes the first general tag exist only for historical reasons and for software/render-styles that are not very specific, they can work so without an update after each creation of a new tag. So please see the project as a project to link from Wikidata to OSM-Wiki and taginfo, not as a project to register all combinations of tags. Greetings Tim Am 30.12.2014 um 11:29 schrieb Janko Mihelić: > > > 2014-12-30 2:06 GMT+01:00 Kolossos <[email protected] > <mailto:[email protected]>>: > > > Perhaps you have a better example to let me re-think this topic. > "cuisine=fastfood" is only used 12 times [2]. > > > For example bike paths (Q221722), highway=path + bicycle=designated + > foot=designated + segregated=yes > > Wind turbine (Q49833), power=generator + generator:source=wind > > I can list all the other generator types here. > > Reservoir (Q131681), natural=water + water=reservoir > plus all the other types of water. > > man_made=tower + > tower:type=communication/climbing/bell_tower/cooling/lighting > > Each one could have its Wikipedia page. > > So, there are a lot. If you don't find a way to use multiple tags, I > think this will not be a serious project. Maybe there's a way to delimit > strings and use a format that can use n strings? > > Janko Mihelić > > > _______________________________________________ > talk mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk > _______________________________________________ talk mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk

