Greetings I'm only just starting to play with relations.
I started to think about modularising them after Merkaartor seemed to get flaky and the interface cumbersome when the bounding box gets large (comprehensive feedback to that list forthcoming). These are transit routes. So I thought of splitting the route into legs or segments and then creating a relation built from those relations. The added benefit would be that the same segment can reused for many different routes. Possibly this is a technique that's well used and terribly obvious to many of you. I haven't seen explicit reference to it, but you know what the search tools are like. So it's occurred to me if I tag a role for a bus stop ("stop") in a "child" relation, and then include that relation in the larger route relation, does the bust stop have the role "stop" in the "parent"? Example: Rel1 = "segment S1 express stops" members: Nd1, Nd3 (bus stops, with role="stop") Rel2 = "segment S1 local stops" members: Nd2, Nd4 Rel3 = "segment S1 stops" (all) members: Rel1, Rel2 Rel4 = "segment S1 ways" members: Way1, Way2 Rel5 = "segment S1" members: Rel3, Rel4 Rel6 = "segment S2" (similarly refined, or not) Rel7 = "Bus route 73" members: Rel5, Rel6 Is Nd2 still a "stop" in Rel3? In Rel7? Is Way1 part of Rel7? If you say "it's up to the client application", that's fine. I just don't want to press ahead with technique, then someone says "that's not what relations were for" if I complain that a relation role was not inherited in something. I guess I would like this inheritance endorsed as something I can rely on (or not). I'm not even convinced it's a good idea across all applications, but it would certainly work for me in this case. Cheers _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk