Hi Martin, Am Mittwoch, 13. Juni 2012, 15:47:12 schrieb Martin Vonwald: > For example the self-defined conditions. Not elegant in my opinion, > improvable, but quite nice!
The only advantage of self-defined conditions is that you can remove some redundancy when two tags contain the same subset of conditions, e.g. applies in situations like this: maxspeed:hgv:(weight>7.5):(Mo-Fr 08:00-16:00):forward=50 maxspeed:hgv:(weight>7.5):(Mo-Fr 08:00-16:00):backward=30 In this case one could somehow define: heavy_trucks_during_week ≔ hgv:(weight>7.5):(Mo-Fr 08:00-16:00) And then write the tags as: maxspeed:heavy_trucks_during_week:forward=50 maxspeed:heavy_trucks_during_week:backward=30 I'm not sure that's a real improvement (note that with the Access Restrictions 1.5, the definition of heavy_trucks_during_week is slightly more complex.) > >> However your example "access:lgv?wet.speed" is a good one against the > >> 1.5 proposal. But why not combine those proposals? This would result > >> in "maxspeed:hgv?wet". I read this as "the MAXSPEED for HGV IF (the > >> question mark) weather is WET is ...". Sound reasonable to me. > > > > More reasonable than "access:lgv?wet.speed", yes. But how is it easier > > than "maxspeed:hgv:wet"? > > Simply because it uses different separators for different purposes. > The : is used often for subkeys. It is not a good choice here. The 1.5 > uses the ? in front of the condition. So it is obvious where the > condition starts. IMO a good approach. The : is always used for subkeys, because that's the definition of a subkey. I'm not sure what you want to express here. About "different purposes": hgv is just short for "I'm driving a heavy goods vehicle", i.e. just another condition (that can be evaluated to true or false). Eckhart _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
