hi, first, I wouldn't use the value of substance=* as key for the detailed level, because in this case we would introduce a new key (i.e. fuel=....) whenever a new substance is introduced (i.e. substance=fuel).
second, I'd stick with two levels (general, detailed), otherwise we'd eventually end up with a substance having 8 levels, down to the molecular structure. cu > So for natural gas worked out to that basic level, as one example, that > would be > substance = gas > gas=fuel > fuel=natural_gas > > None of this colon/semicolon business that has got people so worked up :) > And it may reduce the errors of tagging things like > > substance=fuel > substance:detailed=drinking_water > > And it too gets around drinking_water as that becomes > substance = liquid > liquid=water > water=drinking (or potable?) > Other ideas? Kick them around guys.. brainstorm it. > > Oh.. 'multiphase' is a mixture of gas, fuel and water as it comes out of > some well heads (as stated on the wiki). Interested to see any ideas on > a good tag for that .. nice puzzle that one. Maybe it is the physics tag > of multiphase as in containg all the states of gas, liquid and solid. > Fits... anyone know? > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging