Does any formal definition of a postfix to a key exist? A prefix in prefix:key like in abandoned:shop tells something about the state for the key.
In a proposal like camp_site:restaurant=yes it means that restaurant belongs to camping (a kind of site relation in a line). In practice in this example tourism=camp_site camp_site:restaurant=yes camp_site:bar=yes would be the same as tourism=camp_site restaurant=yes bar=yes You need such a construction if you want to give additional information about the attribute, for example tourism=camp_site restaurant:opening_hours=18:00-22:00 bar:opening_hours=17:00-24:00 It is a way to use existing definitions of attributes (like opening hours for restaurant) for multiple namespace keys on a single node. amenity=restaurant;bar doesn't allow this. It is a clean solution, but I haven't found osm suffixes are set up this way. As far as I have seen osm doesn't treat postfixes in a special way: peanut:butter is parsed the same way as peanut_butter, in other words the complete key peanut:butter has to be defined, unlike abandoned:shop with separate definitions for abandoned and shop. Correct? info/tagging <https://lists.openstreetmap.org/listinfo/tagging> >
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