The proposed tagging scheme doesn't sound too bad to me. It's easily expandable for those who want to map more detail
utilities:sewage=underground utilities:electricity=overhead utilities:communications=underground But I would vote for just mapping what is somewhat verifiable on the ground. (Overhead wires can be seen, water may have signs and plates, sewage may be verified by canal entry points ...) You only problem is that you can't distinguish the three possible states - a street with no utilities present - a street with no overhead but unknown underground utilities - an unmapped street If you just want to specify that there are no overhead lines, you could do a utilities:overhead = no But this defies the logic given above and may lead to others mapping utilities:overhead = electricity; communications which would not be advisable imho. It may still be an option if documented clearly. Just my 2 cents, Chaos
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