Hi! >> If historic data is within the scope of OSM then it surely is not only >> of interest for railways. Therefore a generic way of tagging should >> be used that can apply to any object. Maybe removed=yes|<date> >>[..] > But then we get into the messy situation of not being able to read off > a single tag to decide what type of feature something is.
I don't get it. - You still know it's a railway, a highway, a building, ... . Reading more tags will unveil the name, the operator, the source and so on. There is no difference to a possible 'removed' -tag. We've alway had certain key-tags that give clues about the type of an object, others define properties. An easy example would be the pair highway and name. > Not all data clients are likely to implement a tag that means the > logical opposite of the existence of a feature. > Which 'removed' would not be. It's an objects property just like name is. Anyway, I'd like to suggest the pair 'since=<timestamp>' and 'until=<timestamp>' (with the current widely accepted implicated value 'ever' for not given tags). Regards Andreas _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
