Kevin, What I wanted to make clear before is that you are not the only one who thinks access=permit could be useful. Also, don't make the mistake of conflating tagging and OSM-in-general opinion.
That said, even if this hivemind of ours (and let me add to that "one of us, one of us, one of us") maybe does not like an extra value for the access key, I see no reason why you would need to use another database. There are very many things which are not mapped by just one key, but by many keys combined. You just need a key to classify WHY a thing has a certain access key. I see someone already suggested permit=registration_at_entry/registration_offsite/online/lottery. That could work as a subtag: access:permit=*, foot:permit=*. You could then simply tag it as *:permit=yes meaning "there is some permitting process in place". That would save you the hassle of defining all the many different permitting schemes. It would of course best be extended with some information about the difficulty of the process (on arrival, in advance and simple, in advance and complicated) and contact information. That would also be quite useful to extend the limited model now used on Low Emission Zones (see http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dlow_emission_zone). It would certainly be better then the now-used access=green_sticker_germany :) I couldn't bring myself to read the previous discussion, I'm sorry if I'm repeating something said before. -- Joost
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