On Mon, Oct 18, 2010 at 7:43 PM, Nathan Edgars II <nerou...@gmail.com>wrote:
> On Mon, Oct 18, 2010 at 8:38 PM, Ian Dees <ian.d...@gmail.com> wrote: > > On Mon, Oct 18, 2010 at 7:32 PM, Nathan Edgars II <nerou...@gmail.com> > > wrote: > >> > >> On Mon, Oct 18, 2010 at 8:15 PM, Ian Dees <ian.d...@gmail.com> wrote: > >> > Ways and relations are equally easy to "break" > >> > >> Nope. They're not, because relation membership is not a tag on the > >> way. > > > > Yes, they are, because a relation membership and new way (with new tags > and > > node refs) are both completely separate new entities that need to be > > uploaded. If an editor can reliably do it with a new way then it can also > > reliably do it with a new relation member. > > When a way is downloaded from the API, its tags are all downloaded, > but a separate API query has to be sent to get any referring > relations. > Presumably if you are splitting a way you will have already downloaded at least the one relation way member that you want to split. > > > >> > >> A way is always uploaded with its tags, > > > > Yes, but the new (split) way is not necessarily always uploaded. > > Relations are uploaded after new ways to avoid precondition failures. > Thus it's much more likely that a connection will fail between the way > and the relation than between two ways. I've seen Potlatch take > several tries to upload a large relation, which compounds the possible > problem. It's also obvious from the map when a portion of a way is > accidentally deleted, but even if relations were used to render > shields an error would not always be obvious. > If the renderer uses route relations to render roads, why would errors be any less obvious than when ways were used? > > I have seen these problems in my work on repairing relations. Do you > have any such experience? > I have been offering suggestions to solve the route problems in the original thread. Do you have any such suggestions?
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