Dermot McNally wrote: > 2008/5/27 Rory McCann <[EMAIL PROTECTED]>: >> There's a FAQ entry that says that you should use ";" as a value separator >> (http://wiki.openstreetmap.org/index.php/Faq#What_shall_I_do_for_roads_that_have_multiple_values_for_a_tag.3F). >> Is this offical OSM policy? If so then, merging ways this way seems like The >> Right Thing for potlatch to do. Sounds like some renderers can't cope with >> this. Isn't that a renderer flaw? > > Well... > > Let's start with the simple part. A road is either primary or > secondary, not both. So while a semicolon might be an interesting way > to tag such a shared identity, in the real world you won't ever want > to do so. Predictably, the renderer requires you to commit to one or > the other, so a semicolon here can be considered breakage. > > I'm going to claim that the same holds true for name. When merging > ways, a name conflict generally means you shouldn't have merged them. > In Dublin, there's a long stretch of road that is variously George's > Street, Aungier Street, Wexford Street and a bunch of others. Merge > the wrong two ways and you'll end up with both, split by semicolon. > Once again, there's no good use this could be put to. There is a real > edge case here, though, such as where you may have "Wibble Terrace" > sitting on "Foobar Street", wholly contained within it. I've seen > other discussions on that, but can't see that a semicolon will solve > the problem. > > Road ref begins to enter the territory where you might consider a > standard way of handling multi-valued keys. Not all countries support > multiplexing, but those that do could make use of this. This was the > possible valid case I had in mind for what Potlatch is doing, but TBH, > it feels more like something a mapper should have to consciously set. > Helpfully combining existing values seems a bit wrong. >
I too have had to go back & fix several of these concatenations, mostly in names of roads, where someone has come into a 'done' area with Potlatch & 'prettified' roads - mostly just doing what bezier hinting does, but sometimes bollixing things up. There are a number of roads round my way with London Road ; Tank Hill Road ; etc type errors - I'm getting through them... I hadn't realised that's a Potlatch thing though, I'd just assumed he was a prat. I'd ask the user but I think he's done round here & wandered off to bugger somewhere else up now. It might help if [these people] filled in a bit on their user pages so we have some idea if it's a local newbie or a vagrant pest? Mark _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
