[Tagging] rail routes: how are platforms and stops associated (rail question 2)

[Bjoern Hassler]

Hello again,

In an  osm:relation:route
<https://wiki.openstreetmap.org/wiki/relation:route> (type=route,
route=train/...), you have both platforms and stop positions. How is a
particular platform associated with a stop that serves it?

E.g. for public transport routing, you'd walk (highway=footway) to a
platform (public_transport=platform), at which point you'd change to a
train stopping at a stop (public_transport=stop_position). How would the
routing algorithm know that the platform is associated with the stop?

Is there an existing mechanism or convention, e.g. a tag on the platform
that indicates the stop, or both tagged with the same name or similar?

Thanks!
Bjoern

PS I've noticed that sometimes the stop position is at the far end of a
platform (i.e. the two stop positions are at opposite ends of the station).
Maybe that's so that an association can be made?
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