> admin boundary levels 9 & 10 are unused in the US. > > i see some usage of level 9 for fire district boundaries in the US.
I don't think we should use 9/10 for fire/school/etc. Those are not necessarily subsets of admin_level 8. If a state has a formal notion of something less than town (neighborhoods? as Boston and Newton have) as a *unit of government in general*, then that makes sense for 9. But there can be a dozen kinds of districts besides fire, like school, water, sewer, and so on. So the fire district isn't really a political/governing boundary in the same way. In Massachusetts, firefighing is by town, with a dozen+ mutual aid districts that I think are mostly sets of towns. So I can see tagging a boundary "Massachusetts District 14", or some kind of ref tag with name/number, and having to make up a scheme for each state's way of doing this. So I think admin_level=9 is wrong for this, and there should be * boundary=fire_district name="name of district" Used for entities that have a set of firefighting companies normally under command command and dispatch, and act in many ways similar to a town or city department, but with a geographic area of responsibility that is not a town. * boundary=fire_mutual_aid_district name="mutual aid scheme" Used for an area within with there are city/town fire departments or fire districts, and among which there is a plan for mutual aid. A key difference between this and fire_district is that there is not typically common dispatch and command among the district. A not super clear example is the mutual aid districts sort of listed here: http://scan-ne.net/wiki/index.php?title=Middlesex_County_Fire_Departments Basically each city/town is in exactly one district.
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