[Tagging] "Relations are not categories" excepted for "type=network" ?

[Richard Mann]

It's established that we use relations for routes, because the components
are related geo-spatially to one another (in a particular order, sometimes
having particular roles such as forward/backward). If a way forms part of
multiple routes, that is fine - just make it a member of multiple relations.

However, when it's a group of nodes that have no geo-spatial relationship,
then it's better to avoid using relations, since it's unnecessary, and just
adds complexity (duplication is regarded as better than complexity). As far
as I can see, the rcn node networks are independent, so all the information
could be on the node.

I think there may be relation hierarchies in public transport as well.
Again, it's better to collect independent routes into a network using tags,
rather than a relation.

Richard
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