On 30.08.2012 11:48, WanMil wrote: > > I think so. All functions require a flag if they support points, > lines, polygons and relations. If the ::length function implement the > calculation of a route length then the relation flag would be true. > Anyhow I expect a lots of cases with specialised handling. e.g. a > route relation might have members tagged with forward/backward. A > simple implementation would count the length of all members which > might be twice the real route length. > > That sounds cool. For my maps I don't think that it matters. Bicycle or Hiking or MTB Routes usually don't have backward/forward members. For bus or tram routes, the matter would be clearly important. For me a simple length calculation is all that matters. Most importantly for ways, if not too complicated for relations, then even better.
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