Life's too short to argue about something like this. Just use something that's locally meaningful - that's all most mappers will understand, and if there's an international scale, document that and maybe people will use it (but they probably won't).
level=secondary/primary works for me If it's something that people understand locally, then you can always go and find out more from the "real" world. If you try to impose something internationally, nobody will know what you mean. Richard
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