Julison <[EMAIL PROTECTED]> writes: > In what situation would it be necessary use duplicate keys? If there's a > need, can we reach the same goal without using it? I think duplicated keys > can lead to database problems (e.g. performance) that can be avoid.
A highway can have multiple refs (A11 could be E22 simultaneously), a bulding can have a bakery and a butcher's shop in it and there are certainly other examples where a key can have multiple values. There has been the recommendation to put all those values in one tag and delimit them by semicolon. This is error prone, prevents the semicolon from being used in the value of tags and probably not everybody was following that recommendation anyway. If technical reasons make the use of unique keys necessary I think the API should sort that out and do the concatenating/splitting and escaping of those values. With increasing support for relations across the board, the issue can be avoided by using one relation for the bakery and one for the butcher's shop and both referencing the building. Matthias _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
